> Thanks Bob. I should have mentioned that I am chasing every little uA of
> current. Do you think there will be any leakage in this case? I did not
> consider running the other chips off a PIC output because I thought there
> would be some leakage. Looking at the data sheet of 1 device it suggests
> running the Vdd off a micro output but says the leakage current is some
> 5uA. Would I be better off using a FET as someone else has suggested?
>
> Thanks,
>
>
> Peter

A decent transistor in cutoff should have little or no leakage.
I'm not sure what the 5uA spec is about. If the device is powered from a PIC
pin, then the only thing that matters is the leakage on that PIC pin. If the
PIC pin is driven active low then you shouldn't have any leakage at all.

Watch out for devices being powered by their inputs thru their protection
diodes.

Bob Ammerman
RAm Systems

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