15 ns EE PLD in a 24-pin DIP — what you're working with
The Microchip ATF22V10B-15PC is an electrically-erasable programmable logic device (EE PLD) from the industry-standard 22V10 architecture family. It packs 10 macrocells with a 15 ns propagation delay, running from a single 5V supply, in a 24-pin through-hole DIP package.
15 ns speed — timing margin for your bus
The 15 ns propagation delay (tPD) sets the maximum clock frequency and the timing budget for address decoding, state machine sequencing, or bus interface logic. At 5V, this part can typically handle system clocks up to about 50-66 MHz with adequate margin, depending on the combinatorial path depth.
10 macrocells — logic capacity for glue logic
Ten macrocells, each configurable as registered or combinatorial output with programmable polarity, give you enough logic for address decoders, simple state machines (4-8 states), or bus-interface handshaking. The EE cell means you can reprogram it in-circuit without UV erasure — handy for prototyping or field updates.
There is no official direct replacement listed in the available records; the ATF22V10C series is a later process variant but pin compatibility and timing differences must be verified against your specific design.
24-pin DIP — through-hole legacy fit
The 24-DIP (0.300-inch body width, 7.62 mm) through-hole package is the classic PLCC-alternative footprint. It fits standard 0.600-inch-wide DIP sockets or solders directly into plated through-holes on a 0.100-inch pitch grid. No special reflow profile needed — hand-solder or wave-solder compatible.