AW: CMOS/TTL chip questions (was: Cmos Latch Octal)

[Magnus Danielson]

>>>>> "MC" == Martin Czech <martin.czech at intermetall.de> writes:

Hi!

I have been following this thread with half-open eyes, but I have
noted some differenced between how I perceive things and what I have
seen being noted here. I have thus rechecked with my source and come
up with this:

As for "A", "B" and "UB" there seems to be a slight confusion. In my
1983 RCA CMOS databook (which is a real life-safer!) I found their
definitions which I now will try to convey:

The A-Series of CMOS is the pre-JEDEC standard CMOS familly which can
safely run at powersupply from 3V to 12V. These will have a "A" after
the name (such as CD4009A).

The B-Series of CMOS is the JEDEC 13B standard CMOS familly which can
safely run at powersupply from 3V to 18V. These will have a "B" after
the name (such as CD4001B). To comply with the JEDEC standard the
outputs is buffered.

There is however a suite of components which matches the JEDEC
standard except for the output buffers, these will have a "UB" after
the name (such as CD4069UB). Note that the "U" will make it unbuffered!

Learning how to make a "quite" design is a interesting issue, and it
has many facates. Serious EMC design issues makes you learn the basics
again, but now you get it ;)

Cheers,
Magnus