Eric at Svetlana Electron Devices svetengr at
Mon Mar 2 19:03:19 CET 1998

>> Still lacking a replacement source for some 74C components that needs
>> to run of +12 V... the 74HC familly isn't much of a help. Anyone
>> remember the 74C familly?

Having been messing with CMOS logic since 1973, I hav made that
same mistake many times.

Here are a few easy things to remember:

1. Assume all 74C, 74HC, 74HCT etc. are meant for 5v only.
2. Assume all 4000A and 4000B are usable from 3v to 15v.
3. There are a few 74HC4000 types--assume they are 5v only.

Eric Barbour
Svetlana Electron Devices
Portola Valley CA USA

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