At 23:30 4/07/99 -0700, you wrote:
>RA.4 can be pulled as high as 14V IIRC on the F84 part, should be fine,
>so long as your 12V supply doesn't spike or anything <G>
>
>  Mark

I am not saying Mark is right or wrong here but I would ask for a second
opinion before doing something as drastic as this. I just had a quick
look at the specs to confirm my suspicion and I did not see anything off hand
that would suggest you can do this. IIRC only the 17Cxx parts have high
voltage
pins (and some new 16C5x family member in the future parts list.)

Jim

>Stewart Pye 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.
>
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