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TCA6408A: If the IO ports are unused,

Hiroaki Doi
Prodigy 60 points
Part Number: TCA6408A
Hi,
 
I have a question.
If the IO ports are unused, I should set them Output (and open), or set them Input with pull up resister, right?
(I think it is necessary not to float to avoid through current.)
If possible, I just want to set them Output to reduce the number of parts.
I think the above is OK, but I would like to confirm just in case.
 
Best Regards,
Hiroaki