No official successor is listed; the CY7C1021B-15ZXI variant shares the same base part number but differs in temperature grade (industrial vs. commercial), so verify pin-compatibility and timing before substituting.
64K x 16 organization and 15 ns timing
The 64K x 16 organization provides a 16-bit wide data bus, which suits processors and controllers that access memory in 16-bit words. The asynchronous interface eliminates the need for a clock, simplifying board layout and timing closure — a key advantage when back-fitting a memory into an existing design without re-spinning the controller logic.
Commercial temperature grade and package
If your application sees extended temperatures or requires industrial qualification, the CY7C1021B-15ZXI (industrial temperature range) is the variant to cross-reference.