The Cypress CY7C028-15AC is a 1 Mbit dual-port asynchronous SRAM organized as 64K words by 16 bits. It gives two independent ports — each with its own address, data, and control lines — simultaneous access to the same memory array, which is the defining feature for shared-memory designs like multiprocessor mailboxes, FIFO emulation, or video frame buffers where two bus masters need to read and write without arbitration latency.
100-TQFP — package and footprint reality
The CY7C028-15AC comes in a 100-lead TQFP with a 14x14 mm body. Surface-mount only.
No last-time-buy window is open through the authorized channel. Because this is a dual-port SRAM in a specific 100-TQFP footprint with a 5 V supply and 15 ns timing, a drop-in replacement is not trivial. The Cypress CY7C028 family shares the same base pinout across speed grades, but an exact same-function, same-package replacement from another vendor would need to match the 15 ns access time, the 64K x 16 organization, the 5 V supply, and the 100-TQFP footprint — a narrow parametric window. For dual-sourcing or a new-design alternative, the evaluation should start with the 5 V dual-port SRAMs from Renesas (formerly IDT) or Cypress's own higher-density siblings, but every candidate requires a pin-to-pin and timing comparison against the board's specific bus loading.