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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(PDF) SN74LS08N Datasheet download

A complete newbie question here: LarryD on Dec 29, 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. I hope this quality is good enough. Not the wire colour Read times previous topic – next topic. 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.

Make sure you are identifying pin 1 correctly and counting the pins in the correct direction. Power it with 5V. The chip should not heat up. I am not using any resistors. Disconnect everything but power and ground. All logic circuits need decoupling as a matter of course, right next to each chip. Apologies if I am missing something obvious, I am a first year EE student.

Here are the datasheets: 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.


Glad things are working now.

SN74LS08N and SN74LS05N doesn’t work?

CMOS is symmetrical and you can drive loads either way. That would tend to let the magic smoke out Post Your Answer Discard 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.

See my previous post for output driving currents and suggestion. If it does, try an74ls08n different chip- the original one may have been fried. Email Required, but never shown. Look for I OH. Thanks for the advice. This is the recommended operating current that can be sourced. Make sure that the inputs are within data sheet spec DVM again, at least for the DC levels- scope is better.

Now with Unlimited Eagle board sizes! I meant you could make use of the breadboard bus marked with a blue line.

SN74LS08N Datasheet

Start creating good wiring habits. MarkT Brattain Member Posts: Daasheet 74LS08 circuit issue must be a wiring one. I am only powering the IC. 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.

Sign up using Facebook. Show us a good image of your wiring. Home Questions Tags Users Unanswered. Unconnected inputs are not good news for CMOS logic though, can cause oscillations and higher power consumption.

BobT 5 7. I’m not using any of the AND gates. The datasheet says that it requires a minimum of 4. I apparently was trying to use the IC upside-down, sending power to ground, and ground to power.


CrossRoads on Dec 29, 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. 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. Once you see the outputs from the AND gates acting like they should, hook them up to the next stage.

Terminate to High or Low as needed. Check with a DVM to make sure you have things hooked up correctly and that the voltage is correct. The last thing you did is where you should start looking. Make sure power’s on pin 14 and ground is on pin 7.

Sign up using Email and Password. 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. Post as a guest Name. 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 74LS05 circuit cannot work as that’s an open-collector chip – the outputs can only sink current, not source it.