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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Make sure power’s on pin 14 and ground is on pin 7. Disconnect everything but dxtasheet and ground. Here are the datasheets: Sign up using Facebook.

SN74LS08N Datasheet

Sign up using Email and Password. This is the recommended operating current that can be sourced. Now with Unlimited Eagle board sizes! That would tend to let the magic smoke out 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 is working properly.

The datasheet says that it requires a minimum of 4. CMOS is symmetrical and you can drive loads either way. I’m not using any of the AND gates. You are lacking decoupling caps on your chips BTW – don’t get into that bad habit, nF ceramic for each chip is a good starting point. Not the wire colour I hope this quality is good enough.

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(PDF) SN74LS08N Datasheet download

You would fare better to use modern CMOS families like 74HC, so 74HC08 and gates, 74HC14 datsaheet gates everyone uses the ’14 because it has schmitt-trigger inputs which are very useful for signal conditioning. The chip should not heat up. Email Required, but never shown. 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. Apologies if I am sn74l0s8n something obvious, I am a first year EE student.

Make sure you are sn47ls08n pin 1 correctly and counting the pins in the correct direction. Read times previous topic – next topic. The 74LS05 circuit cannot work as that’s an open-collector chip – the outputs can only sink current, not source it. Thanks for the advice. Home Questions Tags Users Unanswered. If it does, try a different chip- the original one may have been fried. Glad things are working now.

I am not using any resistors. Show us a good image of your wiring. Note that I OL is 8mA, which is the recommended sink current. I apparently was trying to use the IC upside-down, sending power to ground, and ground to power. The 74LS08 circuit issue must be a wiring one. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. LarryD on Dec 29, Make sure that the inputs are within data sheet spec DVM again, at least for the DC levels- scope is better.


Once you see the outputs from the AND gates acting like they should, hook them up to the next stage. MarkT Brattain Member Posts: Look for I OH. Check with a DVM to make sure you have things datazheet up correctly and that the voltage is correct.

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. Yes, apparently you did next sn74ls088n I’ll zoom out a bit more when looking at a picture.

integrated circuit – Why is my SN74LS08N overheating? – Electrical Engineering Stack Exchange

BobT 5 7. 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 don’t understand, why OUT green cable still “high” and the LED on even if both inputs yellow cables are off here both are on.

Unconnected inputs are not good news for CMOS logic though, can cause oscillations and higher power consumption. Sign up or log in Sign up using Google. Power it with 5V.

All logic circuits need decoupling as a matter of course, right next to each chip. I meant you could dahasheet use of the breadboard bus marked with a blue line.

Start creating good wiring habits.