Try the 74HC595. It's a serial shift register. It can be controlled
like any 3-wire serial device....


> Hi
>
> I am looking for a way to multiplex the port pins on the PIC16C73A.  I
 currently require a further 5 input pins and further 8 output pins.  This is
 after having used up most of the pins available on >
> I have been advised by a local contractor to use the MC14094 shift register
 for the output multiplexer as I need to latch the values on the port.  He also
 advised the 74HC597A as an input multiplexer>
> My problem is that the 74HC597A is not commonly available (Yes I tried Avnett
 Kopp).  Is there a different method of mulitplexing the pins on the micro,
 bearing in mind that the output must be latche>
> Any suggestions will be greatly appreciated.
>
> Kind Regards
>
> Martin McArthur
> Weaponted
>