> I think that if you set them high & then use them as inputs 
> you are OK. If you only read from them then the high current 
> pulse output is not enabled. The only time it is enabled is 
> if you are writing to them as outputs and are going through a 
> low-high transistion.

Right, but how does one avoid writing a 1 to the pins you are using as
inputs while at the exact same time writing 1's or 0's to the other pins
which you are using as outputs?

> >
> > http://focus.ti.com/lit/ds/symlink/pcf8575.pdf
> >

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