> The length of the cable will be 4-5 feet 
> typically,maximum being 15 feet. 

I would guess normal CMOS/TLL would be fine for such distances, maybe
use shielding, lower the speed a bit, use 22pF caps and/or 47 ohm series
resistors.

Otherwise: use a remote PIC, communicate with RS485.

Wouter van Ooijen

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