15 ns — the timing budget for address decode and state machines
The Microchip ATF22V10C-15JU is an electrically-erasable PLD from the 22V10 family, delivering a 15 ns propagation delay across 10 macrocells. That propagation delay sets the floor for your address-to-output valid window — if your bus cycle time is 50 ns, this part leaves 35 ns for the rest of the path. It runs on a single 5V supply, so it mates directly with 5V TTL/CMOS buses without level translation.
10 macrocells — right-sized for glue logic consolidation
Ten macrocells cover a handful of 74-series logic functions or a small state machine. Each macrocell can be configured as registered or combinatorial, with programmable output polarity. The 22V10 architecture is well-known — any legacy GAL/PAL design ported to this part reuses the same JEDEC fuse-map concepts, though the programming algorithm differs. The 28-PLCC package with J-leads fits standard 28-pin PLCC sockets or direct solder pads. The J-lead profile gives better mechanical compliance than a gull-wing on boards subject to thermal cycling, which matters in industrial or telecom environments where the 5V rail is still in service.
