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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See my previous post for output driving currents and suggestion. I’m not using any of the AND gates. The 74LS08 circuit issue must be a wiring one. Unconnected inputs are not good news for CMOS logic though, can cause oscillations and higher power consumption.

dwtasheet Read times previous topic – next topic. Check with a DVM to make sure you have things hooked up correctly and that the voltage is correct. Not the wire colour 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.

SN74LS08N – Texas Instruments – PCB Footprint & Symbol Download

Here are the datasheets: The last thing you did is where you should start looking. Start creating good wiring habits. Make sure power’s on pin 14 and ground is on pin 7. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.


I meant you could make use of the breadboard bus marked with a blue line.

Power it with 5V. Glad things are working now. LarryD on Dec 29, Look for I OH. Once you see the outputs from the AND gates acting like they should, hook them up to the next stage. Disconnect everything but power and ground. 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.

(PDF) SN74LS08N Datasheet download

Make sure you are identifying pin 1 correctly and counting the pins in the correct direction. I am not using any resistors. CrossRoads on Dec 29, 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. The datasheet says that it requires a minimum of 4. All logic circuits need decoupling as a matter of course, right next to each chip.

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Terminate to High or Low as needed. Sign up using Facebook.

SN74LS08N from Texas Instruments

If it does, try a different chip- the original one may have been fried. Email Required, but never shown. Note that I OL is 8mA, which is the recommended sink current. Apologies if I am missing something obvious, I am a first year EE student.

SN74LS08N Datasheet

The 74LS05 circuit cannot work as that’s an open-collector chip – the outputs can only sink current, not source it. CMOS is symmetrical and you can drive loads either way.

I am only powering the IC. That would tend to let the magic smoke out 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! Thanks for the advice. The chip should not heat up. Sign up using Email and Password. 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.

Show us a good image of your wiring. I hope this quality is good enough. Post as a guest Name.