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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Unconnected inputs are not good news for CMOS logic though, can cause oscillations and higher power consumption.

Apologies if I am missing something obvious, I am a first year EE student. Not the wire colour 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.

Now with Unlimited Eagle board sizes! 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. Glad things are working now. That would tend to let the magic smoke out CMOS is symmetrical and you can drive loads either way.

SN74LS08N – Texas Instruments – PCB Footprint & Symbol Download

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The 74LS08 circuit issue must be a wiring one. I am only powering the IC. Note that I OL is 8mA, which is the recommended sink current. The datasheet says that it requires a minimum of 4.

The chip should not heat up.

If it dattasheet, try a different chip- the original one may have been fried. Look for I OH. 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.

Disconnect everything but power and ground. The last thing you did is where you should start looking. You are lacking decoupling caps on your chips Datashret – don’t get into that bad habit, nF ceramic for each chip is a good starting point. See my previous post for output driving currents and suggestion. A complete newbie question here: I hope this quality is good enough.


(PDF) SN74LS08N Datasheet download

Check sn7ls08n a DVM to make sure you have things hooked up correctly and that the voltage is correct. Here are the datasheets: Start creating good wiring habits. Show us a good image of your wiring.

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Sign up using Facebook. Email Required, but never shown. I am not using any resistors. I’m not using any of the AND gates. CrossRoads on Dec 29, I apparently was trying to dataxheet the IC upside-down, sending power to ground, and ground to power. Make sure you are identifying pin 1 correctly and counting the pins in the correct direction. LarryD on Dec 29, 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 Datasheet

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policysn74l0s8n our Terms of Service. BobT 5 7.

I meant you could make use of the breadboard bus marked with a blue line. MarkT Brattain Member Posts: Make sure power’s on pin 14 and ground is on pin 7.