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From: John Devereux
Subject: Re: zero-power toggle circuit; was, how to master electronics
Date: Mon, 11 Nov 2002 18:27:26 +0000
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NNTP-Posting-Date: 11 Nov 2002 18:23:39 GMT
>John Devereux wrote:
>> Fred Bloggs wrote:
>>>The practical approach is to build on what you already know how to do,
>>>and this is the story of progress. I want to see that ZERO-power 20A switch.
>> What was wrong with Kevins CMOS flip-flop driving a power
>The idea is to have ZERO current used in the off state, not just a very
>small amount :)
The current draw of a static (unclocked) CMOS 4000 series
device is effectively zero as far as I know. Internally they
are made from mosfets. OK there are more of them than in a
discrete design, but perhaps they are smaller too so it's
not obvious to me which would have a "more zero" current
> So what's wrong with discretes? If you are going to have
>a MOSFET anyway, then one additional transistor would make much more
>sense than a whole chip. Besides, when was the last time you saw a
>single flip flop? Also, if you want to use it for higher voltages, you
>might have to use a regulator for the chip, which blows the whole thing.
There's nothing wrong with discretes (I hadn't seen Win's
post. It's probably better, but required thought and
cleverness to design). The CMOS flip-flop was a
straightforward example of the sought-after "zero power"
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