SN74LS08N .. Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied. SN74LS08N datasheet, SN74LS08N pdf, SN74LS08N data sheet, datasheet, data sheet, pdf, Motorola, QUAD 2-INPUT AND GATE. SN74LS08N from Texas Instruments High-Performance Analog. Find the PDF Datasheet, Specifications and Distributor Information.

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I meant you could make use of the breadboard bus marked with a blue line. Apologies if I am missing something obvious, I am a first year EE student. I’m not using any of the AND gates.

SN74LS08N from Texas Instruments

Sign up using Email and Password. Power it with 5V. See my previous post for output driving currents and suggestion. Here are the datasheets: Not ratasheet wire colour Terminate to High or Low as needed.

Show us datadheet good image of your wiring. Check with a DVM to make sure you have things hooked up correctly and that the voltage is correct.

BobT 5 7. Once you see the outputs from the AND gates acting like they should, hook them up to the next stage.

SN74LS08N Datasheet

You would fare better to use modern CMOS families like 74HC, so 74HC08 and gates, 74HC14 not gates everyone uses the ’14 because it has schmitt-trigger inputs which are very useful for signal conditioning. Note that I OL is 8mA, which is the recommended sink current. MarkT Brattain Member Posts: Home Questions Tags Users Unanswered.


A complete newbie question here: The 74LS08 circuit issue must be a wiring one. LarryD on Dec 29, Thanks for the advice. If it does, try a different chip- the original one may have been fried. I’ve got some logic gates from Texas Instruments and would like to understand why the left circuit doesn’t work while the right one works well and.

CrossRoads on Dec 29, The chip should not heat up. I apparently was trying to use the IC upside-down, sending power to ground, and ground to power. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Sign up or log in Sign up using Google. The datasheet says that it requires a minimum of 4. The key to troubleshooting these kind of problems is to break them down to their essentials and add stages only after what you start with datassheet working properly.

This is the recommended operating current that can be sourced.

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Once you have a nicely quiescent, powered up chip that doesn’t try to immolate itself you can start adding logic inputs and looking at the outputs. I am not using any resistors.



Glad things are working now. Read times previous topic – next topic. CMOS is symmetrical and you can drive loads either way. The last thing you did is where you should start looking. Sign up using Facebook. Post as a guest Name. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

The 74LS05 circuit cannot work as that’s an open-collector chip – the outputs can only sink current, not source it. Make sure power’s on pin 14 datasbeet ground is on pin 7. Make sure that the inputs are within data sheet spec DVM again, at least for the DC levels- scope is better. Unconnected inputs are not good news for CMOS logic though, can cause oscillations and higher power consumption.

I don’t understand, why OUT green sn74ls008n still “high” and the LED on even if both inputs yellow cables are off here both are on.

Look for I OH.