74L series of chips should be checked for pin compatibility with anything else.? Not sure why they did that, but that's been a design problem for any number of years when substituting.
Also, not all 7400 series chips have power and ground at 14/7 or 16/8.? Surprise....
Harvey
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On 7/4/2020 2:21 PM, unclebanjoman wrote:
While checking the circuit I just discover that SN74L93 and SN74LS93 are NOT pin-to-pin compatible!
I was using the "classical" 7493 datasheet from Texas Instruments datasheet and wondering how it worked ...
I never imagined that the 74L93 had a different pinout! I found the correct pin-out in a very old National databook.
Max
