The Cypress CY7C027V-15AC is a 512Kbit asynchronous dual-port SRAM organized as 32K words by 16 bits. It gives two independent processors or controllers simultaneous access to a common memory array through separate left and right ports, each with its own address, data, and control lines. The 15 ns access time means each port can complete a read or write cycle within that window, which sets the bus timing budget for the system interconnect. Parts in this family are commonly used in multiprocessor systems, network switches, and telecom line cards where shared data buffers or mailboxes need arbitration-free access.
At 15 ns access and 15 ns write cycle, this SRAM can keep up with moderate-speed controllers running at 33–66 MHz without wait states, provided the bus timing closes. The parallel interface means the address and data buses are separate — no multiplexing overhead. For a system architect, the 32K x 16 organization gives a 16-bit data path with 32K addressable locations, which is a common width for DSPs and 16-bit MCUs.
That means the only available units are new-old-stock or surplus inventory held by independent distributors. The 100-TQFP (14x14 mm) footprint is the same as many other Cypress dual-port SRAMs of the era, but a drop-in replacement from a different vendor is not guaranteed — the dual-port arbitration logic and timing are vendor-specific.