The ATF22V10BQ-15PC is a 22V10-architecture EE PLD from Microchip with a 15 ns propagation delay. In a 5V system, that 15 ns provides timing margin for address decode or state-machine logic. With 10 macrocells, this part handles medium-complexity glue logic. The through-hole package fits legacy sockets and prototype boards.
Procurement for a BOM line that calls out this exact MPN will need to source through independent distribution, surplus stock, or broker channels. The 22V10 architecture is widely second-sourced by multiple manufacturers (Lattice, Cypress, TI historically), but a pin-compatible drop-in with the same 15 ns speed grade and 24-DIP package is not guaranteed without checking the specific device's timing and programming algorithm. Any replacement should be verified against the original JEDEC fuse map and the system's timing closure.
What the 15 ns speed grade means for the bus
The 15 ns spec is the tPD — propagation delay from any input through the AND-OR array to a combinatorial output. For a registered output, the clock-to-output time is typically shorter. The EE PLD technology means the device is electrically erasable and reprogrammable — no UV eraser needed. That is useful during prototyping or field-update scenarios where the logic pattern changes without pulling the part from the socket. But with the part now obsolete, the programming support (device files, programmer algorithms) may not be maintained in newer programmer models.