72 Mbit QDR II SRAM at 250 MHz — what it means for the data path
The Cypress CY7C1525KV18-250BZXIT is a 72 Mbit synchronous SRAM using the QDR II (Quad Data Rate II) architecture, clocked at 250 MHz. This is a high-bandwidth memory part designed for applications that demand sustained read and write throughput without bus-turnaround penalties — think network packet buffers, high-end test equipment, or FPGA-based signal processing chains where every clock cycle counts. The 8M x 9 organization (72 Mbit total) gives you a 9-bit-wide data bus per port, typical for QDR II parts that separate read and write ports to eliminate dead cycles. The 1.7–1.9 V supply range keeps core power low, matching the I/O voltage of many modern ASICs and FPGAs. The industrial temperature grade (-40 to 85 °C) covers outdoor telecom cabinets, factory-floor controllers, and engine-bay electronics without needing a commercial-only derating. The 165-ball FBGA (13x15 mm) footprint is a dense BGA that requires careful PCB layout for signal integrity at 250 MHz — expect controlled-impedance traces and proper decoupling close to the balls.
Where this part fits — network buffering and FPGA companion memory
The QDR II architecture with separate read and write ports enables simultaneous read and write access without arbitration overhead. Typical uses include packet buffers in Ethernet switches and look-up tables in baseband processing.