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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The 74LS05 circuit cannot work as that’s an open-collector chip – the datashet can only sink current, not source it. 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. CMOS is symmetrical and you can drive loads either way. I hope this quality is good enough. All logic circuits need decoupling as a matter of course, right next to each chip.

Show us a good image of your wiring. CrossRoads on Dec 29, Home Questions Tags Users Unanswered.

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

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The chip should not heat up. Disconnect everything but power and ground.

Make sure power’s on pin 14 and ground is on pin 7. Power it with 5V. LarryD on Dec 29, I am only powering the IC. Now with Unlimited Eagle board sizes! I apparently was trying to use the IC upside-down, sending power to ground, and ground to power. The last thing you did is sn74,s08n you should start looking.

Sign up or log in Sign up using Google. MarkT Brattain Member Posts: Look for I OH. I am not using any resistors.

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

Read times previous topic – next topic. Sign up using Email and Password. Start creating good wiring habits. See my previous post for output driving currents and suggestion.

Yes, apparently you did next time I’ll zoom out a bit more when looking at a picture. The key to troubleshooting these kind sn74os08n problems is to break them down to their essentials and add stages only after what you start with is working properly.


Make sure that the inputs are within data sheet spec DVM again, at least for the DC levels- scope is better.

SN74LS08N Datasheet

This is the recommended operating current that can be sourced. Glad things are working now.

That would tend to let the magic smoke out Here are the datasheets: The datasheet says that it requires a minimum of 4. Email Required, but never shown. I’ve got datasheft logic gates from Texas Instruments and would like to understand why the left circuit doesn’t work while the right one works well and.

By datsheet “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. Note that I OL is 8mA, dwtasheet is the recommended sink current. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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