PicDude wrote:
> Hadn't factored in the internal protection diodes, thanks.
> I need to do this with 8 outputs, and only one OC output.  I started
> with a 2 transistor circuit (1 NPN + 1 PNP), but thought I could
> simplify it this way.

If your voltages are all well controlled, then you can set up a resistor
divider so that the base of the PNP transistor is on when the PIC output is
0V and off when 5V.  I haven't done the math to see what base current drive
level you end up with even if you max out the PIC pin current to 25mA when
low.

I don't really like this idea and would be very unlikely to put it into
production.  You only need one extra transistor to do it robustly.  This is
a jellybean NPN that costs about $.02 in volume.  The total robust solution
is only 2 transistors and 2 resistors.


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