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Wednesday 30 November 2011

LIGHTING/SURGE PROTECTOR CIRCUIT


LIGHTING/SURGE PROTECTOR CIRCUIT

In power lines, usually large amount of voltage is induced (typically very short time with high amplitude) due to lightning (direct or indirect strike) or Transients (Transients caused by other equipments are usually caused by the discharge of stored energy in inductive and capacitive components. Electric motors, such as those used in elevators, heating, air conditioning, refrigeration or other inductive loads, can create a continuous stream of 250V to 1000V transients. DC motor drives, variable speed AC motor drives, DC power supply switching, and portable power tools are other sources of transients.) 

The basic surge suppression circuit shown below consists of a VDR** (Voltage Dependent Resistor) and gas surge suppressor (GDT) connected in series. The protection circuit is connected between live and mains lead. Normally no current flows through GDT and VDR1. When   the voltage between the terminals is higher than the sum of voltage ratings of GDT and VDR1 (here both GDT UZ470B and VDR S20K250 has 250v 16A rating), current starts to flow through those components. If more the voltage raises then more current starts to flow through GDT and VDR1.When the current is normal, the circuit is reset and resumes it’s functioning. Thus the current cannot be raised much over that predetermined value. When the voltage again goes back to normal values G1 and VDR1, the conducting stops and the circuit remains normal.  If the flowing current is more than the specified value of main self-resettable fuse, the fuse will break and the circuit will be protected. After the current is normal, the fuse resets and continues its functioning (protection against short circuit and overload). The circuit is designed to protect sensitive electronic devices against overvoltage transients in normal mains voltage and overload/ short circuit. Two neon pilot lamps are also provided with the circuit diagram to show the status of input and load suppl


Advantages
1)      Normal working voltage = 230v AC/DC
2)      Maximum current rating=16A
3)      Cut-off current =16A
4)      Cut-off voltage= >300v R.M.S
5)      Protection against overloads
6)      Protection for short circuit

Applications
1)      Protection for sensitive components
2)      Protection for motor devices
3)      Telephone line protection
4)      SMPS protection



**A VDR (Voltage Dependent Resistor) is an electronic component with a “diode-like” nonlinear current–voltage characteristic. The name is a portmanteau of variable resistor.  VDRs are often used to protect circuits against excessive transient voltages by incorporating them into the circuit in such a way that, when triggered, they will shunt the current created by the high voltage away from the sensitive components. A VDR is also known as Voltage Dependent Resistor or VDR. A VDR’s function is to conduct significantly increased current when voltage is excessive.)

Tuesday 29 November 2011

World’s Lightest Material: DIAMOND AEROGEL

World’s Lightest Material
Aerogels are a class of materials that exhibit the lowest density, thermal conductivity, refractive index and sound velocity of any bulk solid. Aerogels are among the most versatile materials available for technical applications due to their many exceptional properties.
The new form of diamond, the diamond aerogel, has a very low density similar to that of the precursor of around 40 milligrams per cubic centimeter, which is only about 40 times denser than air.

When it comes to light weight materials, the first thing that comes to our mind is Thermocol. Since its discovery in the year 1941, it has been used in many applications that are suitable for the common man like small life raft, disposable coffee cups, cushioning material in packaging, and so on. Since then, the weights of most light weight materials are compared to Thermocol, and have been given a special category called Ultra-light materials. A team of researchers from HRL Laboratories (Hughes Research Laboratories), in collaboration with Caltech and the University of California, developed a new material that weighs only 1/100th of the weight of Thermocol. The material is also known o be lighter than a diamond aerogel, one of the best ultra-light materials in the world. Before going into detail about the lightest material, let us make a brief study about diamond aerogels.

Diamond aerogel was discovered by researchers at the Lawrence Rivermore National Laboratory by combining high density diamond substances and least dense materials called aerogels. Aerogel is known to be a porous, diffuse rigid material that looks similar to a solid block of smoke and with the texture of a chunk of thermocol. They are industrially manufactured by constructing a conventional gel and then removing the liquid though supercritical drying. The material finds various applications in the making of insulate space suits, pick up cosmic particles, and even home insulation.

The combination of both the materials gave birth to a spongy, translucent version of a diamond. This material when tested was found out to be the least dense diamond ever, and thus the most expensive aerogel ever. They called it a diamond aerogel, definitely the least dense diamond ever and perhaps one of the most valuable aerogels ever. The material was found to be a little denser than air and has all the physical capabilities of a non-liquid gel component. This material also found many applications in the field of structural engineering, optical engineering, and quantum computing and so on.
By combining high pressure with high temperature, Livermore researchers have created a nanocyrstalline diamond aerogel that could improve the optics for something as big as a telescope or as small as the lenses in eyeglasses.
Aerogels are a class of materials that exhibit the lowest density, thermal conductivity, refractive index and sound velocity of any bulk solid. Aerogels are among the most versatile materials available for technical applications due to their many exceptional properties. This material has chemists, physicists, astronomers, and materials scientists utilizing its properties in myriad applications, from a water purifier for desalinizing seawater to installation on a NASA satellite as a meteorite particle collector.
In new research appearing in the May 9-13 online edition of the Proceedings of the National Academy of Sciences, a Livermore team created a diamond aerogel from a standard carbon-based aerogel precursor using a laser-heated diamond anvil cell.
A diamond anvil cell consists of two opposing diamonds with the sample compressed between them. It can compress a small piece of material (tens of micrometers or smaller) to extreme pressures, which can exceed 3 million atmospheres. The device has been used to recreate the pressure existing deep inside planets, creating materials and phases not observed under normal conditions. Since diamonds are transparent, intense laser light also can be focused onto the sample to simultaneously heat it to thousands of degrees.
The new form of diamond has a very low density similar to that of the precursor of around 40 milligrams per cubic centimeter, which is only about 40 times denser than air.
The diamond aerogel could have applications in antireflection coatings, a type of optical coating applied to the surface of lenses and other optical devices to reduce reflection. Less light is lost, improving the efficiency of the system. It can be applied to telescopes, binoculars, eyeglasses or any other device that may require reflection reduction. It also has potential applications in enhanced or modified biocompatibility, chemical doping, thermal conduction and electrical field emission.
In creating diamond aergoels, lead researcher Peter Pauzauskie, a former Lawrence fellow now at the University of Washington, infused the pores of a standard, carbon-based aerogel with neon, preventing the entire aerogel from collapsing on itself.
At that point, the team subjected the aerogel sample to tremendous pressures and temperatures (above 200,000 atmospheres and in excess of 2,240 degrees Fahrenheit), forcing the carbon atoms within to shift their arrangement and create crystalline diamonds.
The success of this work also leads the team to speculate that additional novel forms of diamond may be obtained by exposing appropriate precursors to the right combination of high pressure and temperature.
The aerogel is only 40 times as dense as air. Someday, it may coat the windows, the TV, and the inside of a person's body.
There are plenty of things out there that are shiny, but diamonds have occupied an enduring place in cultural history. At first this was because they were hard. Although it's easy to destroy other gemstones, diamonds are tougher to demolish, don't tarnish, and so can be worn with greater regularity than other jewelry. The particular hardness of diamonds also had industrial uses. Artificial diamonds helped drill bits and saw blades move through materials faster. Upon more study, scientists discovered new characteristics of diamonds - including the fact that they, like water, grow less dense when they freeze. This means that diamond oceans (such as those that might exist on Neptune) could have diamond icebergs floating in them.
To make a diamond aerogel, a carbon aerogel is constructed, and any spaces in the gel are pumped full of neon gas. The gas supports the structure and keeps it from collapsing when the scientists hit the carbon structure with everything they've got. The aerogel is compressed in a diamond-lined cell while being heated with high-intensity lasers. The combination of the heat and pressure change the pliable carbon to diamond, while keeping the structure.
This gel can be molded like plastic, is completely transparent, and is made up of diamonds smaller than a quarter of the wavelength of violet light. Because it doesn't react with many elements, it's biocompatible. This diamond matrix can be used to coat structures in the human body. Because it's transparent, it can be overlaid onto glass or clear plastic, creating tough but well-insulated windows and instruments for spacecraft. Because diamonds give off electrons, it can be used in ultra-light, ultra-tough quantum computers.
The lately found ultra-light material has a density of 0.9 mg/cc, and is known to have its own unique kind of “micro-lattice” cellular architecture. The researchers were successful in making a material that consists of 99.99% open volume by designing the 0.01% solid at the nanometer, micron and millimetre scales.
The material was developed for DARPA so that it could be used for applications in battery electrodes, catalyst supports, vibration or shock energy damping applications and so on. The material has shown excellent mechanical behaviour for a metal, including complete recovery from compression exceeding 50% strain and extraordinarily high energy absorption, when compared to its compact architecture.
This discovery has led the researchers to bring in more ideas to revolutionalize lightweight materials by using this concept to the materials level and designing their architectures at the nano scale.

Monday 28 November 2011

Engineering Graduates and Post Graduates
Tata Consultancy Services (TCS)



To apply for a job, please upload your resume highlighting your qualifications. Please make sure that you provide a valid email address in your resume. We would notify you via email when an opportunity arises that matches your profile.


Click here to apply...


To know more about the work life at TCS, please click here.

Friday 25 November 2011

MOS Op-amp

Wednesday 16 November 2011

GATE Previous Qusn Papers & Answer Key



Click the link to download respective question paper or click to view & download from IITM websiteEC2011Answer Key for EC2011 question paper:
Answer key for EC2010 question paper

Creative Micro Systems (CMS)

Creative Micro Systems (CMS) has been providing quality products to the automation sector for over 20 years. Over the years, CMS has earned repute for providing cost effective and robust solutions. We have in-depth product design, development and manufacturing capabilities which provide us with the necessary expertise to offer generic and custom-made solutions to our clientele.
Our products and solutions are deployed in various electrical utilities, substations, process control and telecom tower infrastructure industries. Our portfolio of products provide a range of solutions for both wired and wireless transfer of data with a wide range of protocol support.
Our in-depth product design, development and manufacturing capabilities provide us with the necessary expertise to offer generic and custom-made solutions to our clientele.
CURRENT OPENINGS:
· Application Software Engineers: BE (Comp. Sc.) / MCA / MSc. IT (Agg. > 70%) - with good knowledge of MS Visual Basic, C++, C#, .NET, PHP, MS-SQL Server - Reporting Services, Integration services, XML, Excel, Reporting applications, ASP.NET. Freshers or upto 2 yrs of exp. can apply.
· Firmware Engineers: BE Comp. Sc. / BE ECE (Agg. > 70%) – with good knowledge of 'C' programming, embedded programming and embedded OS fundamentals. Freshers or upto 2 yrs of exp. can apply.
· Hardware Engineers: BE ECE (Agg. > 70%) - with sound knowledge of the fundamentals of electronics (digital, analog and microcontrollers). Knowledge of Allegro / OrCAD will be an advantage. Freshers or upto 2 yrs of exp. can apply.
· Automation and Product Engineers: BE EEE / Instr. (Agg. > 70%) – with good knowledge of electrical transmission and distribution systems. Candidates would be required to carry out testing and debugging of your products, install and commission RTUs, SCADA systems, communication gateways, etc at various sites in India / abroad. Freshers or upto 3 yrs of exp. can apply.

Tuesday 15 November 2011

Cross-Tab (www.cross-tab.com)



Cross-Tab is a 10-year old; India based Market Research and Analytics Agency, started with a passion for marketing, branding and research. Cross-Tab was a pioneer of sorts when it became India’s first Online MR agency, as early as 2000. Our status as India’s leading provider of Online MR still stands, and we are now a good-sized Global player, having conducted over a million online interviews in the last 12 months.

Our orientation became Global as early as 2002. We were first off-the-block as far as outsourced research services (primarily survey programming and data processing) were concerned. In the last 2 years, we have gradually shifted our focus to providing full-service MR solutions to global clients. We do this in two formats – the first by creating Extension Teams for clients’ research needs (to expand both capacity and capability for them) and the second by participating in the pitch process for full projects.

Our client list includes some of the top companies in the world, top 50 agencies and specialized consulting firms. We have grown over 300% in the last 36 months and are on our way to realize our vision of being a Honomichl Top 25 agency in the next 3 years. We have been declared a winner for Deloitte Technology Fast 50 India 2006 Program, (and also Deloitte Technology Fast 500 Asia 2006 Program).

(Freshers) Walk-In : Trainee Data Analysts @ Mumbai

Job Position : Data Analyst

Job Designation : Trainee

Walk-In Location : Mumbai, Maharashtra

Job Location : Mumbai, Maharashtra

Number of Vacancies : 2

Job Profile :
• The incumbent would be required to program; analyze data & generate reports for our global clients on statistical software like Quantum.

Job Requirement :
• Graduate with excellent written and verbal communication skills
• Strong logical and analytical skills
• Candidates with the knowledge of any one of the programming languages (C, C++) is a must
• Proficient in MS office (Word, Excel)
• Knowledge of programming concepts would be preferred
• Attention to details; quality conscious

Timings :
• Candidates willing to work in rotational night shifts
.org
Reporting line :

Compensation Offered :
• Starting stipend Rs 10,000 PM for the first six months plus night shift allowance.
• The incumbent will be required to sign 15 months training agreement with the organization for the classroom & on the job training provided by the company.

Please Carry (mandatory) :
• Updated Resume Copy
• A printout of this ChetanaS job posting
• Photo ID proof

Note: Candidates who are interested in Software Development, please do NOT apply.

Note: You can mention the reference as 'ChetanaS'.

Walk-In Date : On 15th, 16th & 17th November 2011 : 11.00 AM to 5.30 PM

Walk-In Venue :
Cross-Tab Marketing Services Pvt Ltd,
Unit no 201-B, 2nd Floor, Silver Metropolis,
Off Western Express Highway, Opp. Bimbisar Nagar, Goregaon - East,
Mumbai - 400 063,
Maharashtra
Contact Person : Prajna Karkera

How to get Passport??

HOW TO APPLY FOR A NEW PASSPORT??

ePassport is availabe via Passport Seva Kendra in selected cities in India.

Fee for applying a 18page passport is Rs.1000/- for citizens of age above 18 years.

ONLINE SUBMISSION:

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Click here to Register Now.

Once you register,follow the steps mentioned here-

Step 1: Log into your Passport Seva user account.

Step 2:S elect the Apply Passport Online menu option in the left navigation menu.

Step 3: Fill in the required details in the form and submit the form online.

Step 4 (Optional): Upload the required documents using the Upload Document link on the Applicant Home Page. The documents to be uploaded must be self-attested (signed by the applicant) and must be in pdf format.

Step 5: You are required to be present at the Passport Seva Kendra (PSK)/Mini Passport Seva Kendra (Mini PSK) along with original documents for completion of the application submission process. Schedule an appointment with the Passport Seva Kendra (PSK)/ Mini Passport Seva Kendra (Mini PSK) that comes under the jurisdiction of applicant residence.Online appointment is mandatory to walk into PSK for further processing.Only emergency/medical cases may go to PSK without appointment - service will be provided at the discretion of PSK in -charge. You will need to re-submit the application in case the form submission process at PSK is not completed within 3 month of submitting the application online.


Read procedure for online applicant at Passport Seva Kendra (PSK)/Mini Passport Seva Kendra (Mini PSK)

Submit application through e-form

E-form is the electronic version of the Passport Application form.

You candownload an e-Form to your computer, fill it offline and upload it on the Passport Seva website. You need not be a registered user to download an e-form. However, to upload the filled e-form you need to have a user account. To create your user account, Register now.

You need to have Adobe PDF Reader version 8.0 or later installed on your computer to be able to fill the e-form offline.
Following are the steps involved in online e-form submission -

Step 1: Download the e-form to your computer.

Step 2: Fill the form offline and save it.You need to be a registered user to be able to upload the filled e-form. To create your user account for uploading e-form,
Register now.


Step 3: Log into your Passport Seva user account.

Step 4: Select the Upload e-Form menu option in the left navigation menu and upload your form.

Step 5 (Optional): Upload the required documents using the Upload Documents link on the Applicant Home Page. The documents to be uploaded must be self-attested (signed by the applicant) and must be in pdf format.

Step 6: You are required to be present at the Passport Seva Kendra (PSK) /Mini Passport Seva Kendra (Mini PSK) along with original documents for completion of the application submission process.Schedule an appointment with the Passport Seva Kendra (PSK)/ Mini Passport Seva Kendra (Mini PSK) that comes under the jurisdiction of applicant residence.Online appointment is mandatory to walk into PSK for further processing.Only emergency/medical cases may go to PSK without appointment - service will be provided at the discretion of PSK in -charge.


Note: We recommend you to schedule an appointment with Passport Seva Kendra (PSK)/Mini Passport Seva Kendra (Mini PSK) to reduce your waiting time. You will need to re-submit the application in case the form submission process at PSK is not completed within 3 month of submitting the application online.

Download e-Form

Note: You must have the latest version of Acrobat Reader (9 or above) to read and print these
Forms.
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1. You can click on the links below to download the required e-form to apply for various
passport services:

http://www.passportindia.gov.in/AppOnlineProject/images/arrow-bullets.gif Click here to download passport application form (both main and supplementary form included) to apply for fresh issue/ re-issue of passport .

http://www.passportindia.gov.in/AppOnlineProject/images/arrow-bullets.gif Click here to download Police Clearance Certificate (PCC) application form to apply for issue of Police ClearanceCertificate (PCC).

2. You are required to fill in the downloaded e-forms offline.

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button after login. On successful upload, an Application Reference Number (ARN) shall be generated.

4. Schedule an appointment with the Passport Seva Kendra (PSK)/ Mini Passport Seva Kendra (Mini PSK) that comes under the jurisdiction of applicant residence.Online appointment is mandatory to walk into PSK for further processing.Only emergency/medical cases may go to PSK without appointment - service will be provided at the discretion of PSK in -charge.

How do I fill my application form?

Applying online

Detailed and clear instructions are provided for each field in the form. You can refer the help provided in the online application form.

Applying on printed form

Detailed and clear instructions are attached with the form for filling it up correctly. There is an instructions booklet attached with the form that you should go through carefully before filling up the form.

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Bigshen Technologies Pvt. Ltd. (www.bigshen.com)




Bigshen Technologies is a ISO (9001-2008) certified IT/ITES/BPO company. We specialize in a wide range of software products that transcends the space between humans and machine to bring you ease and comfort with the highest efficiency and effectiveness. From SEO to mobile application development, web-designing and development, php, ria, and .net development to the latest innovations in ERP solutions, cloud computing and also project outsourcing. Also, we bring you the best product-based technology in the field of smart cards, biometric solutions and other innovative security products. We also deal with specialized training programs in the latest technologies.

Bigshen was founded in the year 2009 by 2 dedicated individuals- Mr. Sabu Sakharia K and Mr. Sabith Paul Emmanuel K. Our Board of Directors include 4 other talented members. Bigshen Technologies is an associate firm of the Bigshen Trust. The first branch and current head office is located in Chennai, Tamil Nadu with branches in KINFRA at Malappuram, Kerala.

This ISO 9001:2008 certified software company has a strength of over 75 employees spread across both branches and still growing steadily.


(Freshers) Walk-In : Junior Software Associates @ Malappuram

Job Position : Junior Software Associate

Job Category : IT / Software

Walk-In Location : Malappuram, Kerala

Job Location : Malappuram, Kerala

Eligibility Criteria :
• Graduates / Post Graduates (MCA / BCA / B.Tech / M.Sc (CS/IT) / B.Sc (CS/IT)) with 60% aggregate
• 2010, 2011 Batches (Other batches also Considered)
• No current backlogs or backlogs should be cleared within 6 months period
• Good Written and oral communication skills in English

Desired Experience : 0 Years

Service Conditions :
• Starting gross salary for fresher Rs.12,000/- per month
• Training Period for 6 months.
• Submission of certificate originals within a month of joining
• Food and Accommodation + Medical insurance worth Rs.1,50,000/- per year for self and 2 dependents

Job Description :
• Handle software projects.

Selection Process :
• Reporting time 10 AM On 20th November 2011
• Aptitude Test / GD
• Direct interview (HR) - At Bigshen office in the following week

Please Carry (mandatory) :
• Two Copies of Updated Resume Copy
• A printout of this ChetanaS job posting
• Photo ID proof (College ID / Any other Photo ID)
• Two sets of photocopies of your mark lists
• Three copies of passport size photographs

Note: You can mention the reference as 'ChetanaS'.

Walk-In Date : On 20th November 2011 (Sunday)

Reporting Time : 10.00 AM

Walk-In Venue :
BigshenTechnologies,
KINFRA Neo Space,
Kakkenchery,
Malappuram
Contact Person : Arun (HR)

Contact Numbers : +91-9447396950, +91-9605031558

Monday 14 November 2011

LIST OF 7400 SERIES INTEGRATED CIRCUITS


LIST OF 7400 SERIES INTEGRATED CIRCUITS
The following is a list of 7400 series digital logic integrated circuits. The SN7400 series originated with TTL integrated circuits made by Texas Instruments.
(Note : All parts may not be TTL. May be manufactured with other technologies. Refer datasheet for complete details)
7400
quad 2-input NAND gate
741G00
single 2-input NAND gate
7401
quad 2-input NAND gate with open collector outputs
741G01
single 2-input NAND gate with open drain output
7402
quad 2-input NOR gate
741G02
single 2-input NOR gate
7403
quad 2-input NAND gate with open collector outputs
741G03
single 2-input NAND gate with open drain output
7404
hex inverter
741G04
single inverter
7405
hex inverter with open collector outputs
741G05
single inverter with open drain output
7406
hex inverter buffer/driver with 30 v open collector outputs
741G06
single inverting buffer/driver with open drain output
7407
hex buffer/driver with 30 v open collector outputs
741G07
single non-inverting buffer/driver with open drain output
7408
quad 2-input AND gate
741G08
single 2-input AND gate
7409
quad 2-input AND gate with open collector outputs
741G09
single 2-input AND gate with open drain output
7410
triple 3-input NAND gate


7411
triple 3-input AND gate
7412
triple 3-input NAND gate with open collector outputs
7413
dual Schmitt trigger 4-input NAND gate
7414
hex Schmitt trigger inverter
741G14
single Schmitt trigger inverter
7415
triple 3-input AND gate with open collector outputs
7416
hex inverter buffer/driver with 15 v open collector outputs
7417
hex buffer/driver with 15 v open collector outputs
741G17
single Schmitt-trigger buffer
7418
dual 4-input NAND gate with Schmitt trigger inputs
7419
hex Schmitt trigger inverter
7420
dual 4-input NAND gate


7421
dual 4-input AND gate
7422
dual 4-input NAND gate with open collector outputs
7423
expandable dual 4-input NOR gate with strobe
7424
quad 2-input NAND gate gates with schmitt-trigger line-receiver inputs.
7425
dual 4-input NOR gate with strobe
7426
quad 2-input NAND gate with 15 v open collector outputs
7427
triple 3-input NOR gate
741G27
single 3-input NOR gate
7428
quad 2-input NOR buffer
7430
8-input NAND gate
7431
hex delay elements
7432
quad 2-input OR gate
741G32
single 2-input OR gate
7433
quad 2-input NOR buffer with open collector outputs
7436
quad 2-input NOR gate (different pinout than 7402)
7437
quad 2-input NAND buffer
7438
quad 2-input NAND buffer with open collector outputs
7439
quad 2-input NAND buffer
7440
dual 4-input NAND buffer


7441
BCD to decimal decoder/Nixie tube driver
7442
BCD to decimal decoder
7443
excess-3 to decimal decoder
7444
excess-3-Gray code to decimal decoder
7445
BCD to decimal decoder/driver
7446
BCD to seven-segment display decoder/driver with 30 v open collector outputs
7447
BCD to 7-segment decoder/driver with 15 v open collector outputs
7448
BCD to 7-segment decoder/driver with Internal Pullups
7449
BCD to 7-segment decoder/driver with open collector outputs
7450
dual 2-wide 2-input AND-OR-invert gate (one gate expandable)
7451
dual 2-wide 2-input AND-OR-invert gate
7452
expandable 4-wide 2-input AND-OR gate
7453
expandable 4-wide 2-input AND-OR-invert gate
7454
4-wide 2-input AND-OR-invert gate
7455
2-wide 4-input AND-OR-invert Gate (74H version is expandable)
7456
50:1 frequency divider
7457
60: 1 frequency divider
7458
2-input & 3-input AND-OR Gate
7459
2-input & 3-input AND-OR-invert Gate
7460
dual 4-input expander


7461
triple 3-input expander
7462
3-2-2-3-input AND-OR expander
7463
hex current sensing interface gates
7464
4-2-3-2-input AND-OR-invert gate
7465
4-2-3-2 input AND-OR-invert gate with open collector output
7468
dual 4 bit decade counters
7469
dual 4 bit binary counters
7470
AND-gated positive edge triggered J-K flip-flop with preset and clear
74H71
AND-or-gated J-K master-slave flip-flop with preset
74L71
AND-gated R-S master-slave flip-flop with preset and clear
7472
AND gated J-K master-slave flip-flop with preset and clear
7473
dual J-K flip-flop with clear
7474
dual D positive edge triggered flip-flop with preset and clear
7475
4-bit bistable latch
7476
dual J-K flip-flop with preset and clear
7477
4-bit bistable latch
74H78
dual positive pulse triggered J-K flip-flop with preset, common clock, and common clear (different pinout than 74L78 / 74Ls78)
74L78
dual positive pulse triggered J-K flip-flop with preset, common clock, and common clear
74Ls78
dual negative edge triggered J-K flip-flop with preset, common clock, and common clear
7479
dual D flip-flop
741G79
single D-type flip-flop positive edge trigger non-inverting output
7480
gated full adder


741G80
single D-type flip-flop positive edge trigger inverting output
7481
16-bit random access memory
7482
2-bit binary full adder
7483
4-bit binary full adder
7484
16-bit random access memory
7485
4-bit magnitude comparator
7486
quad 2-input XOR gate
741G86
single 2 input exclusive-OR gate
7487
4-bit true/complement/zero/one element
7488
256-bit read-only memory
7489
64-bit random access memory
7490
decade counter (separate divide-by-2 and divide-by-5 sections)
7491
8-bit shift register, serial In, serial out, gated input
7492
divide-by-12 counter (separate divide-by-2 and divide-by-6 sections)
7493
4-bit binary counter (separate divide-by-2 and divide-by-8 sections)
7494
4-bit shift register, dual asynchronous presets
7495
4-bit shift register, parallel In, parallel out, serial input
7496
5-bit parallel-In/parallel-out shift register, asynchronous preset
7497
synchronous 6-bit binary rate multiplier
741G97
configurable multiple-function gate
7498
4-bit data selector/storage register
7499
4-bit bidirectional universal shift register
74100
dual 4-bit bistable latch


74101
AND-or-gated J-K negative-edge-triggered flip-flop with preset
74102
AND-gated J-K negative-edge-triggered flip-flop with preset and clear
74103
dual J-K negative-edge-triggered flip-flop with clear
74104
J-K master-slave flip-flop
74105
J-K master-slave flip-flop
74106
dual J-K negative-edge-triggered flip-flop with preset and clear
74107
dual J-K flip-flop with clear
74107a
dual J-K negative-edge-triggered flip-flop with clear
74108
dual J-K negative-edge-triggered flip-flop with preset, common clear, and common clock
74109
dual J-Not-K positive-edge-triggered flip-flop with clear and preset
74110
AND-gated J-K master-slave flip-flop with data lockout
74111
dual J-K master-slave flip-flop with data lockout
74112
dual J-K negative-edge-triggered flip-flop with clear and preset
74113
dual J-K negative-edge-triggered flip-flop with preset
74114
dual J-K negative-edge-triggered flip-flop with preset, common clock and clear
74116
dual 4-bit latch with clear
74118
hex set/reset latch
74119
hex set/reset latch
74120
dual pulse synchronizer/drivers


74121
monostable multivibrator
74122
retriggerable monostable multivibrator with clear
74123
dual retriggerable monostable multivibrator with clear
741G123
single retriggerable monostable multivibrator with clear
74124
dual voltage-controlled oscillator
74125
quad bus buffer with three-state outputs, negative enable
741G125
buffer/Line driver, three-state output with active low output enable
74126
quad bus buffer with three-state outputs, positive enable
74128
quad 2-input NOR Line driver
741G126
buffer/line driver, three-state output with active high output enable
74130
quad 2-input AND gate buffer with 30 v open collector outputs
74131
quad 2-input AND gate buffer with 15 v open collector outputs
74132
quad 2-input NAND schmitt trigger
74133
13-input NAND gate
74134
12-input NAND gate with three-state output
74135
quad exclusive-or/NOR gate
74136
quad 2-input XOR gate with open collector outputs
74137
3 to 8-line decoder/demultiplexer with address latch
74138
3 to 8-line decoder/demultiplexer
74139
dual 2 to 4-line decoder/demultiplexer
74140
dual 4-input NAND line driver


74141
BCD to decimal decoder/driver for cold-cathode indicator/Nixie tube
74142
decade counter/latch/decoder/driver for Nixie tubes
74143
decade counter/latch/decoder/7-segment driver, 15 ma constant current
74144
decade counter/latch/decoder/7-segment driver, 15 v open collector outputs
74145
BCD to decimal decoder/driver
74147
10-line to 4-line priority encoder
74148
8-line to 3-line priority encoder
74150
16-line to 1-line data selector/multiplexer
74151
8-line to 1-line data selector/multiplexer
74152
8-line to 1-line data selector/multiplexer
74153
dual 4-line to 1-line data selector/multiplexer
74154
4-line to 16-line decoder/demultiplexer
74155
dual 2-line to 4-line decoder/demultiplexer
74156
dual 2-line to 4-line decoder/demultiplexer with open collector outputs
74157
quad 2-line to 1-line data selector/multiplexer, noninverting
74158
quad 2-line to 1-line data selector/multiplexer, inverting
74159
4-line to 16-line decoder/demultiplexer with open collector outputs
74160
synchronous 4-bit decade counter with asynchronous clear


74161
synchronous 4-bit binary counter with asynchronous clear
74162
synchronous 4-bit decade counter with synchronous clear
74163
synchronous 4-bit binary counter with synchronous clear
74164
8-bit parallel-out serial shift register with asynchronous clear
74165
8-bit serial shift register, parallel Load, complementary outputs
74166
parallel-Load 8-bit shift register
74167
synchronous decade rate multiplier
74168
synchronous 4-bit up/down decade counter
74169
synchronous 4-bit up/down binary counter
74170
4 by 4 register file with open collector outputs
74172
16-bit multiple port register file with three-state outputs
74173
quad d flip-flop with three-state outputs
74174
hex d flip-flop with common clear
74175
quad d edge-triggered flip-flop with complementary outputs and asynchronous clear
74176
presettable decade (bi-quinary) counter/latch
74177
presettable binary counter/latch
74178
4-bit parallel-access shift register
74179
4-bit parallel-access shift register with asynchronous clear and complementary Qd outputs
74180
9-bit odd/even parity bit generator and checker


74181
4-bit arithmetic logic unit and function generator
74182
lookahead carry generator
74183
dual carry-save full adder
74184
BCD to binary converter
74185
binary to BCD converter
74186
512-bit (64x8) read-only memory with open collector outputs
74187
1024-bit (256x4) read only memory with open collector outputs
74188
256-bit (32x8) programmable read-only memory with open collector outputs
74189
64-bit (16x4) ram with inverting three-state outputs
74190
synchronous up/down decade counter
74191
synchronous up/down binary counter
74192
synchronous up/down decade counter with clear
74193
synchronous up/down binary counter with clear
74194
4-bit bidirectional universal shift register
74195
4-bit parallel-access shift register
74196
presettable decade counter/latch
74197
presettable binary counter/latch
74198
8-bit bidirectional universal shift register
74199
8-bit bidirectional universal shift register with J-Not-K serial inputs
74200
256-bit ram with three-state outputs


74201
256-bit (256x1) ram with three-state outputs
74206
256-bit ram with open collector outputs
74209
1024-bit (1024x1) ram with three-state output
74210
octal buffer
74219
64-bit (16x4) ram with noninverting three-state outputs


74221
dual monostable multivibrator with schmitt trigger input
74222
16 by 4 synchronous FIFO memory with three-state outputs
74224
16 by 4 synchronous FIFO memory with three-state outputs
74225
asynchronous 16x5 FIFO memory
74226
4-bit parallel latched bus transceiver with three-state outputs
74230
octal buffer/driver with three-state outputs
74232
quad NOR Schmitt trigger
74237
1-of-8 decoder/demultiplexer with address latch, active high outputs
74238
1-of-8 decoder/demultiplexer, active high outputs
74239
dual 2-of-4 decoder/demultiplexer, active high outputs
74240
octal buffer with Inverted three-state outputs


74241
octal buffer with noninverted three-state outputs
74242
quad bus transceiver with Inverted three-state outputs
74243
quad bus transceiver with noninverted three-state outputs
74244
octal buffer with noninverted three-state outputs
74245
octal bus transceiver with noninverted three-state outputs
74246
BCD to 7-segment decoder/driver with 30 v open collector outputs
74247
BCD to 7-segment decoder/driver with 15 v open collector outputs
74248
BCD to 7-segment decoder/driver with Internal Pull-up outputs
74249
BCD to 7-segment decoder/driver with open collector outputs
74251
8-line to 1-line data selector/multiplexer with complementary three-state outputs
74253
dual 4-line to 1-line data selector/multiplexer with three-state outputs
74255
dual 4-bit addressable latch
74256
dual 4-bit addressable latch
74257
quad 2-line to 1-line data selector/multiplexer with noninverted three-state outputs
74258
quad 2-line to 1-line data selector/mulitplexer with Inverted three-state outputs
74259
8-bit addressable latch
74260
dual 5-input NOR gate


74261
2-bit by 4-bit parallel binary multiplier
74265
quad complementary output elements
74266
quad 2-input XNOR gate with open collectoroutputs
74270
2048-bit (512x4) read only memory with open collector outputs
74271
2048-bit (256x8) read only memory with open collector outputs
74273
8-bit register with reset
74274
4-bit by 4-bit binary multiplier
74275
7-bit slice Wallace tree
74276
quad J-Not-K edge-triggered Flip-Flops with separate clocks, common preset and clear
74278
4-bit cascadeable priority registers with latched data inputs
74279
quad set-reset latch
74280
9-bit odd/even Parity bit Generator/checker


74281
4-bit parallel binary accumulator
74283
4-bit binary Full adder
74284
4-bit by 4-bit parallel binary multiplier (low order 4 bits of product)
74285
4-bit by 4-bit parallel binary multiplier (high order 4 bits of product)
74287
1024-bit (256x4) programmable read-only memory with three-state outputs
74288
256-bit (32x8) programmable read-only memory with three-state outputs
74289
64-bit (16x4) RAM with open collector outputs
74290
decade counter (separate divide-by-2 and divide-by-5 sections)
74291
4-bit universal shift register, binary up/down counter, synchronous
74292
programmable frequency divider/digital timer
74293
4-bit binary counter (separate divide-by-2 and divide-by-8 sections)
74294
programmable frequency divider/digital timer
74295
4-bit bidirectional register with three-state outputs
74297
digital phase-locked-loop filter
74298
quad 2-input multiplexer with storage
74299
8-bit bidirectional universal shift/storage register with three-state outputs


74301
256-bit (256x1) random access memory with open collector output
74309
1024-bit (1024x1) random access memory with open collector output
74310
octal buffer with Schmitt trigger inputs
74314
1024-bit random access memory
74320
crystal controlled oscillator


74322
8-bit shift register with sign extend, three-state outputs
74323
8-bit bidirectional universal shift/storage register with three-state outputs
74324
voltage controlled oscillator (or crystal controlled)
74340
octal buffer with Schmitt trigger inputs and three-state inverted outputs


74341
octal buffer with Schmitt trigger inputs and three-state noninverted outputs
74344
octal buffer with Schmitt trigger inputs and three-state noninverted outputs
74348
8 to 3-line priority encoder with three-state outputs
74350
4-bit shifter with three-state outputs
74351
dual 8-line to 1-line data selectors/multiplexers with three-state outputs and 4 common data inputs
74352
dual 4-line to 1-line data selectors/multiplexers with inverting outputs
74353
dual 4-line to 1-line data selectors/multiplexers with inverting three-state outputs
74354
8 to 1-line data selector/multiplexer with transparent latch, three-state outputs
74356
8 to 1-line data selector/multiplexer with edge-triggered register, three-state outputs


74361
bubble memory function timing generator
74362
four-phase clock generator/driver
74365
hex buffer with noninverted three-state outputs
74366
hex buffer with Inverted three-state outputs
74367
hex buffer with noninverted three-state outputs
74368
hex buffer with Inverted three-state outputs
74370
2048-bit (512x4) read-only memory with three-state outputs
74371
2048-bit (256x8) read-only memory with three-state outputs
74373
octal transparent latch with three-state outputs
741G373
single transparent latch with three-state output
74374
octal register with three-state outputs
741G374
single d-type flip-flop with three-state output
74375
quad bistable latch
74376
quad J-Not-K flip-flop with common clock and common clear
74377
8-bit register with clock enable
74378
6-bit register with clock enable
74379
4-bit register with clock enable and complementary outputs
74380
8-bit multifunction register


74381
4-bit arithmetic logic unit/function generator with generate and propagate outputs
74382
4-bit arithmetic logic unit/function generator with ripple carry and overflow outputs
74385
quad 4-bit adder/subtractor
74386
quad 2-input XOR gate
74387
1024-bit (256x4) programmable read-only memory with open collector outputs
74388
4-bit register with standard and three-state outputs
74390
dual 4-bit decade counter
74393
dual 4-bit binary counter
74395
4-bit universal shift register with three-state outputs
74398
quad 2-input mulitplexers with storage and complementary outputs
74399
quad 2-input mulitplexer with storage


74408
8-bit parity tree
74412
multi-mode buffered 8-bit latches with three-state outputs and clear


74423
dual retriggerable monostable multivibrator
74424
two-phase clock generator/driver
74425
quad gates with three-state outputs and active low enables
74426
quad gates with three-state outputs and active high enables
74428
system controller for 8080a
74438
system controller for 8080a
74440
quad tridirectional bus transceiver with noninverted open collector outputs


74441
quad tridirectional bus transceiver with Inverted open collector outputs
74442
quad tridirectional bus transceiver with noninverted three-state outputs
74443
quad tridirectional bus transceiver with Inverted three-state outputs
74444
quad tridirectional bus transceiver with Inverted and noninverted three-state outputs
74448
quad tridirectional bus transceiver with Inverted and noninverted open collector outputs
74450
16-to-1 multiplexer with complementary outputs
74451
dual 8-to-1 multiplexer
74452
dual decade counter, synchronous
74453
dual binary counter, synchronous
74453
quad 4-to-1 multiplexer
74454
dual decade up/down counter, synchronous, preset input
74455
dual binary up/down counter, synchronous, preset input
74456
NBCD (Natural binary coded decimal) adder
74460
bus transfer switch


74461
8-bit presettable binary counter with three-state outputs
74462
fiber-optic link transmitter
74463
fiber-optic link receiver
74465
octal buffer with three-state outputs
74468
dual mos-to-ttL level converter
74470
2048-bit (256x8) programmable read-only memory with open collector outputs
74471
2048-bit (256x8) programmable read-only memory with three-state outputs
74472
programmable read-only memory with open collector outputs
74473
programmable read-only memory with three-state outputs
74474
programmable read-only memory with open collector outputs
74475
programmable read-only memory with three-state outputs


74481
4-bit slice processor elements
74482
4-bit slice expandable control elements
74484
BCD-to-binary converter
74485
binary-to-BCD converter
74490
dual decade counter
74491
10-bit binary up/down counter with limited preset and three-state outputs
74498
8-bit bidirectional shift register with parallel inputs and three-state outputs


74508
8-bit multiplier/divider
74520
8-bit comparator


74521
8-bit comparator
74526
fuse programmable identity comparator, 16 bit
74527
fuse programmable identity comparator, 8 bit + 4 bit conventional Identity comparator
74528
fuse programmable Identity comparator, 12 bit
74531
octal transparent latch with 32 ma three-state outputs
74532
octal register with 32 ma three-state outputs
74533
octal transparent latch with inverting three-state Logic outputs
74534
octal register with inverting three-state outputs
74535
octal transparent latch with inverting three-state outputs
74536
octal register with inverting 32 ma three-state outputs
74537
BCD to decimal decoder with three-state outputs
74538
1 of 8 decoder with three-state outputs
74539
dual 1 of 4 decoder with three-state outputs
74540
inverting octal buffer with three-state outputs


74541
non-inverting octal buffer with three-state outputs
74544
non-inverting octal registered transceiver with three-state outputs
74558
8-bit by 8-bit multiplier with three-state outputs
74560
4-bit decade counter with three-state outputs


74561
4-bit binary counter with three-state outputs
74563
8-bit d-type transparent latch with inverting three-state outputs
74564
8-bit d-type edge-triggered register with inverting three-state outputs
74568
decade up/down counter with three-state outputs
74569
binary up/down counter with three-state outputs
74573
octal D-type transparent latchwith three-state outputs
74574
octal D-type edge-triggered flip-flop with three-state outputs
74575
octal D-type flip-flop with synchronous clear, three-state outputs
74576
octal D-type flip-flop with inverting three-state outputs
74577
octal D-type flip-flop with synchronous clear, inverting three-state outputs
74580
octal transceiver/latch with inverting three-state outputs


74589
8-bit shift register with input latch, three-state outputs
74590
8-bit binary counter with output registers and three-state outputs
74592
8-bit binary counter with input registers
74593
8-bit binary counter with input registers and three-state outputs
74594
serial-in shift register with output registers
74595
serial-in shift register with output latches
74596
serial-in shift register with output registers and open collector outputs
74597
serial-out shift register with input latches
74598
shift register with input latches
74600
dynamic memory refresh controller, transparent and burst modes, for 4K or 16K drams


74601
dynamic memory refresh controller, transparent and burst modes, for 64K drams
74602
dynamic memory refresh controller, cycle steal and burst modes, for 4K or 16K drams
74603
dynamic memory refresh controller, cycle steal and burst modes, for 64K drams
74604
octal 2-input multiplexer with latch, high-speed, with three-state outputs
74605
octal 2-input mulitplexer with |latch, high-speed, with open collector outputs
74606
octal 2-input mulitplexer with latch, glitch-free, with three-state outputs
74607
octal 2-input mulitplexer with latch, glitch-free, with open collector outputs
74608
memory cycle controller
74610
memory mapper, latched, three-state outputs
74611
memory mapper, latched, open collector outputs
74612
memory mapper, three-state outputs
74613
memory mapper, open collector outputs
74620
octal bus transceiver, inverting, three-state outputs


74621
octal bus transceiver, noninverting, open collector outputs
74622
octal bus transceiver, inverting, open collector outputs
74623
octal bus transceiver, noninverting, three-state outputs
74624
voltage-controlled oscillator with enable control, range control, two-phase outputs
74625
dual voltage-controlled oscillator with two-phase outputs
74626
dual voltage-controlled oscillator with enable control, two-phase outputs
74627
dual voltage-controlled oscillator
74628
voltage-controlled oscillator with enable control, range control, external temperature compensation, and two-phase outputs
74629
dual voltage-controlled oscillator with enable control, range control
74630
16-bit error detection and correction (EDAC) with three-state outputs
74631
16-bit error detection and correction with open collector outputs
74632
32-bit error detection and correction
74638
octal bus transceiver with inverting three-state outputs
74639
octal bus transceiver with noninverting three-state outputs
74640
octal bus transceiver with inverting three-state outputs


74641
octal bus transceiver with noninverting open collector outputs
74642
octal bus transceiver with inverting open collector outputs
74643
octal bus transceiver with mix of inverting and noninverting three-state outputs
74644
octal bus transceiver with mix of inverting and noninverting open collector outputs
74645
octal bus transceiver
74646
octal bus transceiver/latch/multiplexer with noninverting three-state outputs
74647
octal bus transceiver/latch/multiplexer with noninverting open collector outputs
74648
octal bus transceiver/latch/multiplexer with inverting three-state outputs
74649
octal bus transceiver/latch/multiplexer with inverting open collector outputs
74651
octal bus transceiver/register with inverting three-state outputs
74652
octal bus transceiver/register with noninverting three-state outputs
74653
octal bus transceiver/register with inverting three-state and open collector outputs
74654
octal bus transceiver/register with noninverting three-state and open collector outputs
74658
octal bus transceiver with Parity, inverting
74659
octal bus transceiver with Parity, noninverting


74664
octal bus transceiver with Parity, inverting
74665
octal bus transceiver with Parity, noninverting
74668
synchronous 4-bit decade Up/down counter
74669
synchronous 4-bit binary Up/down counter
74670
4 by 4 register File with three-state outputs
74671
4-bit bidirectional shift register/latch /multiplexer with three-state outputs
74672
4-bit bidirectional shift register/latch/multiplexer with three-state outputs
74673
16-bit serial-in serial-out shift register with output storage registers, three-state outputs
74674
16-bit parallel-in serial-out shift register with three-state outputs
74677
16-bit address comparator with enable
74678
16-bit address comparator with latch
74679
12-bit address comparator with latch
74680
12-bit address comparator with enable


74681
4-bit parallel binary accumulator
74682
8-bit magnitude comparator
74683
8-bit magnitude comparator with open collector outputs
74684
8-bit magnitude comparator
74685
8-bit magnitude comparator with open collector outputs
74686
8-bit magnitude comparator with enable
74687
8-bit magnitude comparator with enable
74688
8-bit equality comparator
74689
8-bit magnitude comparator with open collector outputs
74690
4-bit decimal counter/latch/multiplexer with asynchronous reset, |three state outputs
74691
4-bit binary counter/latch/multiplexer with asynchronous reset, three-state outputs
74692
4-bit decimal counter/latch/multiplexer with synchronous reset, three-state outputs
74693
4-bit binary counter/latch/multiplexer with synchronous reset, three-state outputs
74694
4-bit decimal counter/latch/multiplexer with synchronous and asynchronous resets, three-state outputs
74695
4-bit binary counter/latch/multiplexer with synchronous and asynchronous resets, three-state outputs
74696
4-bit decimal counter/register/multiplexer with asynchronous reset, three-state outputs
74697
4-bit binary counter/register/multiplexer with asynchronous reset, three-state outputs
74698
4-bit decimal counter/register/multiplexer with synchronous reset, three-state outputs
74699
4-bit binary counter/register/multiplexer with synchronous reset, three-state outputs


74716
programmable decade counter
74718
programmable binary counter
74724
voltage controlled multivibrator


74740
octal buffer/Line driver, inverting, three-state outputs
74741
octal buffer/Line driver, noninverting, three-state outputs, mixed enable polarity
74744
octal buffer/Line driver, noninverting, three-state outputs
74748
8 to 3-line priority encoder


74779
8-bit bidirectional binary counter (3-state)
74783
synchronous address mulitplexer
74790
error detection and correction (EDAC)
74794
8-bit register with readback
74795
octal buffer with three-state outputs
74796
octal buffer with three-state outputs
74797
octal buffer with three-state outputs
74798
octal buffer with three-state outputs


74804
hex 2-input NAND drivers
74805
hex 2-input NOR drivers
74808
hex 2-input AND drivers


74832
hex 2-input OR drivers
74848
8 to 3-line priority encoder with three-state outputs


74873
octal transparent latch
74874
octal d-type flip-flop
74876
octal d-type flip-flop with inverting outputs
74878
dual 4-bit d-type flip-flop with synchronous clear, noninverting three-state outputs
74879
dual 4-bit d-type flip-flop with synchronous clear, inverting three-state outputs
74880
octal transparent latchwith inverting outputs


74882
32-bit lookahead carry generator
74888
8-bit slice processor
74922
16-key encoder
74923
20-key encoder
74926
4-digit counter/display driver
74935
3.5-digit digital voltmeter (DVM) support chip for multiplexed 7-segment displays
74936
3.75-digit digital voltmeter (DVM) support chip for multiplexed 7-segment displays


741005
hex inverting buffer with open-collector output
741035
hex noninverting buffers with open-collector outputs
742960
error detection and correction (EDAC)


742961
edac bus buffer, inverting
742962
edac bus buffer, noninverting


742968
dynamic memory controller
742969
memory timing controller for use with EDAC
742970
memory timing controller for use without EDAC


741G3208
single 3 input OR-AND Gate;
744002
dual 4-input NOR gate
744015
dual 4-bit shift registers
744017
5-stage ÷10 Johnson counter
744020
14-stage binary counter


744024
7 stage ripple carry binary counter
744028
BCD to decimal decoder
744040
12-stage binary ripple counter


744046
phase-locked loop and voltage-controlled oscillator
744049
hex inverting buffer
744050
hex buffer/converter (non-inverting)
744051
high-speed CMOS 8-channel analog mulitplexer/demultiplexer
744052
dual 4-channel analog multiplexer/demultiplexers
744053
triple 2-channel analog multiplexer/demultiplexers
744059
programmable divide-by-N counter
744060
14-stage binary ripple counter with oscillator


744066
quad bilateral switches
744067
16-channel analog multiplexer/demultiplexer
744075
triple 3-input OR gate
744078
8-input OR/NOR gate


744094
8-bit three-state shift register/latch


744316
quad analog switch


744511
BCD to 7-segment decoder
744520
dual 4-bit synchronous binary counter
744538
dual retriggerable precision monostable multivibrator


747007
hex buffer


747266
quad 2-input XNOR gate


7429841
10-bit bus-interface D-type latch with 3-state outputs


7440103
presettable 8-bit synchronous down counter
7440105
4-bit by 16-word FIFO register

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