Hi Folks,
A quick question about RA4 when used for output. On most devices it is open
collector. What is the max voltage I can pull this up to? For example if I
wanted to drive a MOSFET from it could I use it to pull down to zero volts
and have a resistor hooked up to say a 12V supply to turn the FET on? I have
a feeling this is not allowed but I thought I would ask. I seem to remember
something in the spec for 16F87X products saying 8V or so, but I don't have
the spec handy and I can't get to Microchips web site at the moment!

On the same subject what about other common logic families TTL/CMOS etc. Do
they have chips that take PIC level logic inputs and have open collector
outputs that could be used in this way. Or would I be better of using some
sort of driver chip that is intended for the job?

Sorry if this seems a stupid question, but I really a software kind of guy!

Andy

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