The Cypress CY7C006A-15AXCT is a 128Kbit dual-port asynchronous SRAM organized as 16K x 8 bits, in a 64-TQFP (14x14 mm) surface-mount package. It provides two independent ports with separate address, data, and control lines, allowing two bus masters to access the same memory array without external arbitration logic.
The 15 ns access time allows zero-wait-state reads if the address-to-data path through the SRAM plus PCB trace delay stays under one clock cycle. At higher clock rates or with longer board traces, the 15 ns window may force a single wait state.
Dual-port architecture — arbitration and contention
The dual-port architecture includes internal arbitration logic to handle simultaneous access to the same memory location from both ports. The CY7C006A uses a 'busy' flag scheme: when both ports address the same byte, one port is granted access and the other's busy output asserts, telling its master to retry. In designs where both ports rarely contend (e.g., one port writes, the other reads different addresses), throughput approaches the full 15 ns cycle on each side independently.
5 V supply — legacy rail requirement
Level translation is needed if the bus masters operate at lower voltages.
The CY7C006A-15AXCT is marked obsolete by Cypress (now Infineon). Sourcing is limited to surplus inventory and the independent distribution channel. Any available stock carries date codes from the last production run, and buyers should verify date-code freshness and authenticity.