I have a relay mux that I am actuating using a PIC16F84A, a bunch of
74HC595 serial to parallel shift registers and ULN2803 drivers.

Given that I have the SCLK, RCLK, CLR lines all tied in parallel on the
74HC595's, how many 74HC595's can a PIC drive?

Is there a table somewhere that shows the current requirements for driving
each chip family?

TIA
Dave

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