On Tue, 5 Aug 2003, Mike Singer wrote:

> Vasile Surducan wrote:
> > > "...an external device _sourcing_, say, 20 mA."
> > >
> > > Open drain should sink current.
> > >
> >
> >   Are you positive sure ? I think an open drain could also
> > sink current...
> > No one say that PIC can't be supplied with Vdd = 0V and
> > GND = -5V.
> > So, in respect to the human convention of standardize
> > everything, then sourcing and sinking are just some words
> > related to ground, which can be any...
>
> Why ground? Why not a point of connection?
> The point where open drain connects to external device.
> External device sources current to open drain through this
> point. Open drain sinks current from external device.
> Current flows from "+" to "-"(ground); like water from a
> greater height to a lower.
>
> Am I wrong?
>
   No :)

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