QDR II at 250 MHz — why the bus width matters
The Cypress CY7C1414KV18-250BZXI is a 36Mbit QDR II synchronous SRAM organized as 1M x 36, clocked at 250 MHz. The 36-bit word width maps directly to common 36-bit processor and FPGA memory buses, so one chip fills a full data lane without needing two narrower parts. QDR II architecture gives separate read and write data ports, each transferring on both clock edges, which eliminates bus-turnaround dead cycles that standard synchronous SRAMs incur. This part targets high-throughput packet buffering in network switches, router line cards, and test equipment where back-to-back read/write throughput is the bottleneck.
250 MHz vs 300 MHz — the speed tier decision
The sibling CY7C1415KV18-300BZXC runs at 300 MHz, 50 MHz faster, but its operating temperature range is commercial 0°C to 70°C. For a line card that lives in a temperature-controlled central office, the 300 MHz part may be the pick. For outdoor small-cell base stations or factory-floor Ethernet switches that see -20°C startup, the 250 MHz industrial part is the one that keeps the link up.
The base product number CY7C1414 covers the whole KV18 family, so if a future spin requires a speed or temperature variant, the footprint and interface stay the same.
Supply rails and decoupling for the 1.7V–1.9V core
Core supply range is 1.7V to 1.9V, which means this SRAM runs from a nominal 1.8V rail. The 165-ball FBGA (13x15 mm) package has a central ground plane and multiple VDDQ and VDD balls; a 4-layer PCB with dedicated 1.8V plane and a 0.1 µF cap per supply ball pair is the standard decoupling recipe.