15 ns propagation delay — timing budget for legacy 5 V glue logic
The Microchip ATF16V8B-15SU is an electrically erasable PLD (EE PLD) from the 16V8 family, offering 8 macrocells and a 15 ns propagation delay.
8 macrocells — what the density covers
Eight macrocells map to roughly 8 to 16 registered or combinatorial logic equations — enough to absorb a handful of 74-series glue-logic packages (decoders, state machines, address decoders) on a single chip. The 15 ns propagation delay keeps combinatorial paths within a 33 MHz clock domain without wait-state penalties.
20-SOIC wide-body footprint
The 20-SOIC package measures 0.295" (7.50 mm) wide — the wide-body variant, not the narrower 0.300-inch SOIC. The 1.27 mm pitch is standard for SOIC-20, but the wider body means the land pattern differs from the narrow SOIC-20 used by some competitors. Verify the existing board footprint before committing.