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Read times previous topic – 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. 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 sn74lz08n 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, not 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.
SN74LS08N Texas Instruments | Ciiva
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 sn74lss08n 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. Now with Unlimited Eagle board sizes! LarryD on Dec 29, sn74lss08n, CrossRoads on Dec 29, ,