> But will putting 9V
> into the open-collector output cause problems?  I'd
> like to see if anyone knows from experience before I
> kill a good chip.  :)   If this won't work, does
> anyone have any other low-parts count alternatives?

In my experience it will not hurt the chip. My WISP programmer uses RA4 of a
16x84 to switch the (13V) VPP to the target chip. But the relevant figure is
not in the datasheet. Note that for a 16f62x the 'maximum open drain
voltage' IS in the datasheet: 8.5 V.

Wouter van Ooijen

Van Ooijen Technische Informatica: http://www.voti.nl
Jal compiler for PIC uC's:  http://www.xs4all.nl/~wf/wouter/pic/jal

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