74LS21N from Texas Instruments High-Performance Analog. Find the PDF Datasheet, Specifications and Distributor Information. SN54/74LS DUAL 4-INPUT AND GATE. LOW POWER SCHOTTKY. J SUFFIX. CERAMIC. CASE N SUFFIX. PLASTIC. CASE 1. 1. Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise .

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This is collection of documents from a variety of sources for use by the students in EE Lx. Some of the documents may not be relevant to the current semester’s project but are left here for reference purposes.

Some of the following documents are in PDF format. Questions, corrections and comments about the content of this page should be sent to Allan Weber. For information on the Freescale microcontrollers that were used in EE up until aboutand sample code for them, click datasneet.

Texas Instruments

vatasheet The datasheets listed dahasheet have been obtained from various places on the Internet. They are all copyrighted by someone but we’re not going to worry about that.

Datasheets for the newer parts were mostly obtained from the manufacturers or from Jameco and Digi-Key where we order most of our parts. Others were snagged from web sites wherever we could find them. If you are looking for TTL datasheets, try the links below. Fairchild Semiconductor – They used to have a good collection of very presentable datasheets but it looks like most of the 74LS ones have been removed.

Most are not scanned images so datsheet you can find these, it will be easier to read and print out. On Semiconductor – I think they are mainly a distributer of ICs, not a manufacturer.

74LS21 | Inventoteca Soluciones Disruptivas

They may have absorbed Motorola’s TTL product line, or at least their tech library. Either way, they have a large collection of datasheets online and they are good quality. Texas Instruments – TI has a 74ls21b collection of datasheets online, both for current chips and for many obsolete ones. Many of their files are scans of pages from their printed databooks and the images come out looking pretty bad.

If you can’t find a non-scanned copy somewhere else, get it from here. However they do have a PDF of a pocket version of their logic data book.

None of these sites are particulary easy to use if you don’t know what part you are looking for. The “74LS” will find it in one of the dagasheet common logic family, and the “N” says to find a standard plastic package.

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These parts are not normally used in current EELx projects. Some are nonLS parts that are logically compatible with 74LSxx parts, but may have problems electrically due to different fan-in and fan-out.

Other parts have have power and ground at non-standard positions or are listed as obsolete by the manufacturers and are no longer being produced.

However they are still present in the our stock of parts so if you want to use them you can. If you are interested in purchasing electronic components for building projects, here are some links to places we buy parts from.

Course topics EE Lx Lab Notes – A collection of topics related to constructing the class projects soldering, wire wrapping, debugging, etc. All students should read this before starting construction of your project in the lab. Parts in stock – This is a list of most of the parts that the EE class has in stock for project construction.

These sample schematics for devices unrelated to the class projects are similar to the types of schematics that dqtasheet be produced for your project.

Here’s some of the stuff we use and recommend. Atmel Microcontrollers For information on the Freescale microcontrollers that were used in EE up until aboutand sample code for them, click here. The notes below mostly apply to both microcontrollers even if the description of the dtasheet only mentions one of daasheet. This document discusses programming the ATmegaP but much of the information also applies to other ATmega or ATtiny microcontrollers used in the class.

These were originally written for the ATmegaA and should run unchanged on that processor.

Output can be confirmed with an oscilloscope. Datashest – Controls an LED with a switch. S – Displays a sequence of hexadecimal numbers on a seven-segment display.

S – Displays a sequence of hexadecimal numbers on dayasheet seven-segment display using an internal timer and interrupts for delays. Other Atmel microcontroller documents and links AVR microcontroller interrupt vectors – A list of the interrupt vector names for the AVR microcontrollers listed above. Using the serial communications interface on the ATmegaP and MCJL16 microcontrollers – An explanation of the serial port and and how to use it to exchange data with other devices, along with examples of sending and receiving data over the ATmegaP and MCJL16 serial ports.

Using the analog-to-digital conversion module on the ATmegaP microcontroller – An 74ks21n of how the ADC module on the P works and how to configure it for doing conversions.


Many figures didn’t survive the translation too well or are missing entirely. These will be fixed someday, maybe. Most are designed to test PALs on a demo board in the lab.

Implements a 3-bit up-down binary counter with binary outputs and seven-segment display outputs. Implements a modulo 5 up-down counter with binary outputs and decoded 1-of-5 outputs. Implements a 3-bit up-down Gray code counter with binary outputs and the seven-segment display outputs the message “EE L”. Part 1 and Part 2. Jameco Electronics – We used to buy most of our stuff from Jameco before they “improved” their web site. It’s now more difficult to find stuff on the web site so you may be better off requesting a printed catalog or looking through the PDF version of the printed catalog.

It’s usually easier to find parts in that catalog than online. It will also get you on their mailing list for future catalogs. Digi-Key – This is our other primary supplier. They have a large inventory, the prices are reasonable, and we usually get the order pretty quickly.

They send out a printed catalog of over pages. However the size of the catalog sometimes make it hard to find things. Their inventory changes a lot so you might not be able to buy the same things six months from now. Modern Device – They seem to have a interesting variety of components including many sensors and related components. Newark and Mouser Electronics – These two are major suppliers to the electronics industry with very large inventories. Not sure if they have minimum order amounts that may make it hard for the hobbyist but they are worth a look.

We have no experience using the program at this time but it’s probably worth checking out. All Electronics – This is basically a surplus store with both new and used components.

Their prices on some stuff is very good, provided you can find what you need. You can also visit their store at Oxnard St. Micro – They sell a wide variety of interesting stuff. Download their PDF catalog. If they have something you need, you can probably get it at a good price, but it’s sometimes hard to find things. It’s definitely worth at least one trip there just to see the place, and its storage area outside in the back.