The CY7C018-15AC is a 576 Kbit dual-port asynchronous SRAM from Cypress, organized as 64K x 9 bits. It provides two independent ports with separate address, data, and control lines, allowing two bus masters to access the same memory array simultaneously. Typical applications include shared buffers in multi-processor systems, FIFO emulation, and mailbox registers in telecom line cards or industrial controllers.
The 15 ns access time means address-to-data valid in 15 ns max, which supports zero-wait-state operation with most 33 MHz and slower controllers. For a dual-port part, this is the arbitration latency ceiling — the time from one port asserting its address to the other port seeing the bus-busy flag. If your system runs a 40 MHz or faster bus, you will need a faster part; the 15 ns grade fits the 33 MHz and slower domain.
The CY7C018-15AC is listed as obsolete. Buyers should confirm date code and condition at quote time; stock is typically new-old-stock or surplus from decommissioned production runs. For new designs, evaluate the CY7C028 or CY7C024 family if a dual-port SRAM with similar density and 5 V supply is required — but those parts are also aging and should be checked for lifecycle status independently.