> > Note though that 5V tolerant only deals with the input side 
> of the IO, 
> > outputs will not swing to 5V, so whatever you're driving has to be 
> > able to handle only getting 3.3V levels.
> 
> In case this hasn't already been suggested: you can configure 
> the outputs as 
> OC and add pull-up resistors to 5V.

Would it be necesary to use the pins as OC? I would expect the '5V
tolerancy' to remain even when the top-side transistor is conducting, or
would that inject 5V into the internal 3.3V line?

Wouter van Ooijen

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