On 5/14/22 15:35, dwight via cctalk wrote:

>>> You are stuck with using an original 7474 family assuming this is driving 
>>> other early TTL. 74LS74, and others simply don't have the drive capability 
>>> to work.
>> I know LS has less fanout, but is it not able to drive plain 74xx at all?  
>> That doesn't sound right.  If the circuit in question runs near the fanout 
>> spec of plain 74 the yes, 74LS won't work.
>>
>> Spec sheets and the actual schematic will give a definitive answer.
>>

I've got a whole parts drawer full of 74S74s, which I believe exceed the
output current capabilities of the original 7474.   There's also the
74ABT74, if you want a beefer BiMOS version.  Heck, I can probably come
up with a couple of crufty old 74H74s...

--Chuck


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