550 MHz QDR II+ SRAM — what it does and where it fits
The Cypress CY7C25632KV18-550BZC is a 72 Mbit synchronous SRAM built on the QDR II+ architecture, organized as 4M x 18 bits. It clocks at 550 MHz, delivering a peak data rate that suits high-bandwidth buffer applications in networking line cards, test equipment, and telecom infrastructure where deterministic latency matters more than density. The 1.7 V to 1.9 V core supply keeps I/O levels consistent with low-voltage logic families, and the 165-FBGA package (13x15 mm) fits a standard surface-mount footprint for high-speed memory arrays.
550 MHz clock — what it buys the design
At 550 MHz, this part delivers a double-data-rate (QDR) transaction on every clock edge, effectively doubling the throughput per pin versus a single-data-rate SRAM at the same frequency. That matters when the FPGA or ASIC on the other side of the bus is running a 550 MHz memory controller and needs a matched-speed partner without wait states. The 4M x 18 organization maps directly to an 18-bit data bus; if the design calls for 36-bit width, the sibling CY7C2565XV18-633BZC (2M x 36, 633 MHz) is a higher-frequency alternative with a wider word, though at half the depth per chip.
EOL status — sourcing reality for this line
Temperature grade and package — deployment boundaries
Rated for 0°C to 70°C ambient, this SRAM is intended for indoor, temperature-controlled environments. It is not rated for industrial or outdoor use.