10 Jan
2005
10 Jan
'05
6:56 a.m.
Hi
4000 series is good to around 15 volts someplace as I recall.
I don't remember how low it goes but it seems like 2.5v someplace.
It does run slower at lower voltages and even at 5 volts, it
is really slow for logic. It really depends on the application.
Dwight
From: "Scott Stevens"
<chenmel(a)earthlink.net>
---snip---
Doesn't 4000-series CMOS logic operate pretty well at non-5 volt levels
if powered to such levels? I haven't used any in years, but all the
'building block' logic components are available, i.e. the 4049 and such.
A company I worked for made a muscle stim device out of a single 4000
series 'hex converter' using feedback to make multivibrators, crude
comparators, drivers, etc. out of the gates. It wasn't powered at 5
volts, the whole thing ran from a 9 volt battery. The logic thresholds
for 4000 CMOS are 1/3 and 2/3 of VCC, for whatever VCC you supply, if I
recall.
11 Jan
11 Jan
12:32 a.m.
>>>> "Dwight" == Dwight K Elvey
<dwight.elvey(a)amd.com> writes:
Dwight> Hi 4000 series is good to around 15 volts someplace as I
Dwight> recall. I don't remember how low it goes but it seems like
Dwight> 2.5v someplace. It does run slower at lower voltages and
Dwight> even at 5 volts, it is really slow for logic. It really
Dwight> depends on the application.
True, though RTL is pretty slow too, so 4000 series CMOS might fit
well in that respect.
On the other hand, RTL logic thresholds for a given Vcc are likely to
differ from CMOS thresholds, and that would be a trouble area.
paul
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