15 ns propagation delay — the timing budget for glue-logic replacement
The ATF16V8BQL-15XC is an electrically erasable programmable logic device (EE PLD) from Microchip's 16V8 family, packing 8 macrocells in a 20-TSSOP package. Its 15 ns propagation delay sets the combinatorial path timing — fast enough to replace 74-series TTL or PAL logic in existing designs without re-timing the bus. Operating from a single 5 V supply, this part is a drop-in fit for legacy 5 V logic systems. The surface-mount 20-TSSOP (4.40 mm width) keeps the board footprint compact, but the 0.65 mm pitch demands careful soldering profile control during rework.
This means the manufacturer no longer accepts new orders or scheduled production. For a pin-compatible alternative, the buyer should evaluate other 16V8-class EE PLDs in the same 20-TSSOP package, verifying the 15 ns speed grade and 5 V supply compatibility.
8 macrocells — logic capacity and fit
Eight macrocells is the standard density for 16V8 devices, sufficient for small address decoders, state machines, or bus-interface glue. Each macrocell can be configured as registered or combinatorial output, with programmable polarity. The EE (electrically erasable) programming allows in-system reprogramming — useful for prototyping or field updates, unlike OTP equivalents. The 15 ns speed supports clock rates up to about 66 MHz in registered mode, depending on the feedback path.