4 Nov
2011
4 Nov
'11
6:02 p.m.
On 4 Nov 2011 at 22:42, Tony Duell wrote:
And there are quite a few 'odd' fucntions in
the 4000 series CMOS
range that were not commonly used and never made it into 74HCxxx, My
older Philips 4000 series data book lists an HPIB talker.listner state
machine IC, for example.
And I think (without checking the databooks) that 4000 series will
stand a higher supply voltage thea 74HCxxx
That is true--74HCxx are generally rated at +7V max. I believe that
the "middle" voltage (i.e. recommended) voltage for 4000 CMOS was
10V. At 5V, the speed dropped to less than half that at 10V. Back
then, 10 or 15V was commonly thought of as "CMOS logic levels". If
someone uses that term today, it's likely he means 3.3V or less.
National also had a parallel series of CMOS chips, with 4000
equivalents, the MM56xx series.
I still have the pile of 4010 buffers I bought new. I was using
them in a too-clever PMOS-to-TTL conversion setup (I don't recall the
details or even if it worked). They have 1976 date codes.
For a time, it seemed as if 4000 CMOS couldn't find itself. Lots of
counters and shift registers. Did anyone actually use a 4581 ALU in
anything? I've always wondered if anyone built up a CPU from 4000
CMOS...
4000 series CMOS is still in current production.
--Chuck