If it's a fairly slow device a EPROM programmed with a table might do as a
12 (or more) to 8 (or more) enables I have used this in sub 1mhz devices
with success

peter

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Justin Grimm
> Sent: Wednesday, August 04, 1999 7:18 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Logic substitutes
>
>
> Hi all
> Ive got a circuit design that uses 4 or 5 TTL chips to take in
> 16 address lines to enable various peripherals.
> Im looking to reduce the IC count to 1 chip.
> Ive heard about pal,gal and pld chips but have no idea how
> to use them or program them. Would these chips suit the job
> and if so where do I learn about them?
> Also, would a pic chip be fast enough to substitute a logic
> device?
> Thanks
> Justin