20 ns EE PLD in a socket-friendly DIP
The ATF22V10CQZ-20PC is a Microchip 22V10-series electrically erasable PLD with a 20 ns propagation delay, 10 macrocells, and a 5V supply rail. It comes in a 24-DIP (0.300", 7.62mm) through-hole package that fits standard DIP sockets — no hot-air station needed for a field swap.
What the 20 ns speed means for your bus timing
A 20 ns tPD means the combinatorial output settles within 20 ns of the input changing. In a 5V system, that leaves 20 ns for the rest of the data path.
Microchip lists the ATF22V10CQZ-20PC as obsolete.
10 macrocells — how much logic fits
With 10 macrocells, each configurable as registered or combinatorial output, this PLD handles glue logic like chip-select generation, 3-to-8 decoders, or a 4-bit counter. It is not meant for a full CPU peripheral bus — that would need a larger CPLD or FPGA.
EE PLD — field reprogrammable without UV
The electrically erasable (EE) programmable type means you can reprogram it on a standard device programmer — no UV eraser needed. That makes it practical for prototyping and field updates, as long as you have a programmer that supports the ATF22V10C family.
24-DIP package — socket swap in the field
The 24-DIP (0.300", 7.62mm) through-hole package is socket-friendly. A field-service tech can swap it with a standard IC puller and a DIP socket — no lab bench, no hot air. Pin 1 orientation is clearly marked by the notch and dot on the package body.