Brendan Moran <bmoran@MILLENNIUM.CA> wrote:
> I wrote:
> > Brendan Moran <bmoran@MILLENNIUM.CA> wrote:
> > > > I don't suppose you know of any 3volt three pin reset
> > > > generators that have an open collector output that can
> > > > withstand the 13volts Vpp on a PIC?  Seems like no-one makes
> > > > such a beast.
> > >
> > > I'd say don't worry about the open collector, and put a diode in
> > > series with the ouput.
> >
> > The reset generator still needs to withstand 13V if you don't want
> > any current to flow in the diode when the anode is at Vpp. It's
> > unlikely that a totem-pole device would meet this requirement with
> > a 3V supply.
>
> Erm... I think you missed the point.
>
>      |        Vpp
> Reset|         |   |
> Gen  |---|>|---+---|PIC
>      |             |
>      |
>
> That should be clearer.  No need to withstand 13V.

Ah. I naturally assumed that since the OP wanted an open-collector
driver, he wanted to sink current from the reset pin, not source
current to it.

-- Dave Tweed

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