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

Read times previous topic ns74ls08n next topic. A complete newbie question here: 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.

Here are the datasheets: Show us a good image of your wiring. The last thing you did is where you should start looking. Look for I OH.


SN74LS08N from Texas Instruments

This is the recommended operating current that can be sourced. Note that I OL is 8mA, which is the recommended sink current. I hope this quality is good enough. 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.

See my previous post for output driving currents and suggestion.

MarkT Brattain Member Posts: The 74LS05 circuit cannot work as that’s an open-collector chip – the outputs can only sink current, datasgeet source it. 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. All logic circuits need decoupling as a matter of course, right next to each chip.

The 74LS08 circuit issue must be a wiring one. CMOS is symmetrical and you can drive loads either way. 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.


Unconnected inputs are not good news for CMOS logic though, can cause oscillations and higher power consumption. Not the wire colour I meant you could make use of the breadboard bus marked with a blue line. Terminate to High or Low as needed.

Start creating good wiring habits. Yes, apparently you did next time I’ll zoom out a bit more when looking at a picture.

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