Re: Timer circuit help

From: Ken Smith (kensmith_at_green.rahul.net)
Date: 11/23/04 

Date: Tue, 23 Nov 2004 17:48:49 +0000 (UTC)

In article <p2n6q0deevbq9krrtobnq7pd88mb4v9fop@4ax.com>,
John Fields <jfields@austininstruments.com> wrote:
[...]
Added note:
> Note
> \
> +--[C]--+--[R]--+
> | | * |
> | [R] |
> | | |
> | B--+ |
> +--Y | B-+
> | A--+---Y
> | A-+
> | |
> | +---------+ |
> +-O|> Q(n+2)|--+
>IN>--+--A | |
> | Y-----+--|R Qn|---A
> +--B | +---------+ Y-->OUT
> +----------------B
>
>
>* I dont believe this R is needed for CMOS, and a short should work
>just as well.

The resistor at the input, limits the current put into the substrate diode
when the node indicated by "note" swings outside the rails. This point
goes outside the rails by about 1/2Vcc. 

-- 
--
kensmith@rahul.net   forging knowledge

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