633 MHz QDR II+ SRAM — what the clock rate buys you
The Infineon CY7C2563XV18-633BZXC is a 72Mbit synchronous QDR II+ SRAM organized 4M x 18, clocked at 633 MHz over a parallel interface. That clock rate translates to a read-write bus turnaround with no dead cycles — the QDR architecture delivers back-to-back transactions on separate read and write ports, so the controller never stalls waiting for the bus to flip. This part is built for high-throughput data buffers in network switches, test equipment, and signal-processing pipelines where every clock cycle carries payload.
72Mbit density and 4M x 18 organization
The 4M x 18 organization means this SRAM presents an 18-bit-wide data bus at each address. That matches well with 18-bit-wide DSP datapaths or 36-bit-wide buses when paired in a dual-device configuration. Compared to the CY7C25652KV18-500BZC, which runs at 500 MHz with a 2M x 36 organization, the CY7C2563XV18-633BZXC trades a narrower bus for a higher clock rate — pick the 633 MHz part when the controller can run at that speed and needs the extra throughput per pin, or the 500 MHz 2M x 36 part when you need a wider word in a single package.