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From: firstname.lastname@example.org (Win Hill)
Subject: Re: zero-power toggle circuit; was, how to master electronics
Date: 27 Nov 2002 05:29:11 -0800
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NNTP-Posting-Date: 27 Nov 2002 13:29:11 GMT
Tony Williams wrote
> 4000 CMOS is 3v Vdd(min). AFAIR, at 2.5v it is already up
> and working. The outputs are soggy and not very unusable,
> but it is logically working ok. A bistable state defined
> at 2.5v will probably be reliably maintained as Vdd increases.
According to my spice models it's working at 1.2V, and I
wouldn't be surprise if it isn't working even below that,
in the sense that it can remember and hold a state.
> | Vdd |
> | | \| | \ |
> +----|1 >o----+-----|2 >o--+
> | /| | | /
> | \
> | /R
> | \
> | |
> A single-R must be able to pull a bistable out of the wrong
> state at Vdd= 2.5v, but not pull it out of the desired state
> when working at Vdd= 3v.
> Quite a tightrope to walk...
Only if one intends working at 3V. If the minimum voltage
expected for using the switch is say 5V (a dead 9V battery,
and better suited for turning on a p-channel MOSFET), then
there's are nice design margin available.
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