The Infineon CY7C136-25JXC is a 16Kbit dual-port asynchronous SRAM organized as 2K x 8 bits, in a 52-PLCC package with J-leads for surface-mount assembly. It provides two independent ports with separate address, data, and control lines, allowing two bus masters to read or write the same memory array without external arbitration logic.
The 25 ns access time applies to both read and write cycles (write cycle time is also 25 ns). In a dual-port system, that means each port can complete a full transaction in 25 ns, and the part supports back-to-back accesses on either port without dead cycles. If your shared-memory window is, say, a 40 MHz bus (25 ns period), this part matches the bus clock one-to-one — no wait-state penalty. Below 20 MHz you have margin for PCB trace delay and capacitive loading on the parallel interface.
Infineon lists the CY7C136-25JXC as obsolete. No last-time-buy window or successor part number is provided in the official record.
Supply and temperature — fit check
That rules out outdoor, under-hood, or unventilated enclosures.