At 09:01 AM 19/05/2002 -0700, you wrote:
>> 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?
>
>First, all PIC outputs have low side drivers, so when the other circuit is
>off the PIC output pin will be actively driven to 0V.  Leakage into the
>other circuit is not an issue.  Second, whatever "leakage" there is thru the
>disabled high side drivers when a totem pole output is low is there anyway,
>it just goes thru the low side driver instead of to the output.
>
>Again, how much current does the other circuit draw when on?

about 3-5 mA is all.

Peter
>
>
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