All I could see in the data sheet said maximum 6V on all I/O pins too.
What's the point of having an open drain output then?

Stewart.


>>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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