Read the .PDF file; no protection diodes to Vdd on /MClr or RA4,
definitely.

I'll ask my favorite FAE, though I'm pretty certain.

  Mark

Sean Breheny wrote:
> 
> Hi Robert,
> 
> I don't think there are any protection diodes (or at least, none to Vdd) on
> RA4, just because of this. In addition, there is no way the chip could go
> into melt down through a 10K resistor.
> 
> Sean
> 
> At 10:02 PM 7/5/99 -0700, you wrote:
> >        Probable the results would be rather catastrophic, There is a
> 200ľa limit
> >in current injected into any pin. If for ANY reason the protection diodes
> >are forward biased the chip will go into melt down. This comdition has been
> >known to burn labels off of 'JW' parts... One of the sure ways to destruct
> >a chip.
> >
> >                Robert K. Johnson
> >                rkj1@ix.netcom.com
> >
> >At 04:30 PM 7/5/99 +1000, you wrote:
> >>Hi....
> >>
> >>I'm interfacing a 16F84 to a 4051 analog mux with a 12V supply.
> >>Is it safe to put a 10k pullup resistor to +12V from the open drain output
> >>RA4?.
> >>
> >>
> >>Thanks
> >>Stewart.
> >
> |
> | Sean Breheny
> | Amateur Radio Callsign: KA3YXM
> | Electrical Engineering Student
> \--------------=----------------
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