> On page 10 of the data sheet for the TI PCF8575 (is that PDF 
> or PCF? - data sheet says PCF) it indicates max of 300uA 
> "standard" pullup current and typ 1mA transient pullup 
> current. So, yes it is ok to have some other device driving a 
> 0 into one of these inputs even if you try to output a 1 at 
> the same time (but why would would you?).

Because you have no other option when you need to put others pins (used for
outputs) into new states. Or did I miss something?

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