64Kbit dual-port SRAM — 55 ns asynchronous arbitration
The CY7C144-55JXC: It allows two independent processors or controllers to read/write the same memory array without clock coordination — each port has its own address, data, and control lines.
No official successor or pin-compatible replacement is recorded from the original manufacturer. Availability is lot-specific and confirmed at RFQ — no stock-holding claim is made. Buyers should qualify an alternate dual-port SRAM in the same 68-PLCC footprint if a long-term supply is required.
55 ns access time — what it means for bus timing
The 55 ns access time sets the minimum read/write cycle window. In a dual-port arbitration scenario, each port's address setup-to-data-valid delay is 55 ns max — this governs the bus speed ceiling. A 20 MHz bus with a 50 ns cycle leaves only 5 ns margin; consider a faster part (e.g., 25 ns or 15 ns) if the system clock exceeds 18 MHz.