The ATF22V10CQZ-20SI is officially obsolete per Atmel's lifecycle status.
20 ns speed — 10 macrocells — 5V EE PLD
This is an electrically erasable programmable logic device (EE PLD) from the 22V10 series, delivering a propagation delay of 20 ns. The 10 macrocells provide the logic fabric for glue-logic integration, state machines, or address decoding in 5V systems. The 20 ns speed means the combinatorial output settles within 20 ns of the input transition — this sets the maximum system clock rate the part can support without pipeline stages. The 5V-only supply rail is typical of legacy 5V logic families — no core or I/O voltage translation is needed when interfacing with 5V TTL or CMOS peripherals.
