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.

Cheers,
-Neil.



Dario Greggio (in giro) wrote:
> 
> 
> Internal protection diodes of PIC's pins will make your transistor 
> conduct all the time - since they shunt to 5.3Vcc (VDD+0.3 or so).
> 
> You should use a true Open Collector pin. Or place an intermediate 
> transistor in between.
> 
> -- 
> Ciao, Dario
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