7.5 ns propagation delay — the timing budget it buys you
The ATF16V8C-7PC is a 5V electrically erasable PLD from Microchip's 16V8 family, delivering a 7.5 ns propagation delay across 8 macrocells. That speed puts it in the fast-glue-logic tier: it can decode addresses for a 40 MHz bus without adding a wait state, or generate chip-selects with enough margin that the downstream memory doesn't see a setup-time violation on a cold board at 70 °C.
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Pin-compatible replacement path
The B suffix parts use a different programming algorithm and have slightly different timing characteristics. If you are re-spinning the board anyway, the ATF16V8B is the natural successor — same 8 macrocells, same 5V rail, same 20-PDIP package. For an existing programmed ATF16V8C-7PC, the JEDEC file will need recompilation for the B variant's fuses.
20-pin DIP — the socketed legacy footprint
The 0.300-inch wide, 7.62 mm body 20-pin DIP is the standard through-hole PLCC-alternative footprint. It fits a 24-pin socket with the outer four positions unused, or a dedicated 20-pin DIP socket.