Re: Impedance of digital inputs

[Pooh Bear]

Rich Grise wrote:

> On Tue, 04 Oct 2005 10:48:55 +0100, Pooh Bear wrote:
> > Patrick wrote:
> >
> >> Sounds good.  What about digital inputs of other logic families, e.g.
> >> TTL?  If I remember correctly TTL inputs draw a few micro-amps of
> >> current with a logic HIGH (5V) input.
> >
> > They draw a hell of a lot more when LOW.
>
> Actually, they're _sourcing_ current when low. ;-) ;-)
>
> Cheers!
> Rich

Yeah, yeah, I know ! Didn't want to spoil the flow of it though.

Graham