QDR II SRAM at 333 MHz — what it means for the bus
The Infineon CY7C1525KV18-333BZXC is a 72 Mbit QDR II synchronous SRAM organized as 8M x 9, clocked at 333 MHz. That clock rate gives you a double-data-rate read and write on separate ports — no bus-turnaround dead cycles, which is the whole point of the QDR architecture. The 1.7 V to 1.9 V core supply keeps I/O levels in the low-voltage range, sized for contemporary ASICs and FPGAs that run the same rail. This part is built for high-throughput buffer applications: network packet processing, switch fabrics, and high-end test equipment where back-to-back transactions matter more than density.
Temperature grade and environment
Rated for 0 °C to 70 °C ambient — commercial temperature grade. That means this part belongs in a climate-controlled rack, not an outdoor cabinet or an engine bay. The 165-FBGA (13x15 mm) package demands careful PCB layout: fine-pitch BGA routing with controlled impedance for the 333 MHz clock and data strobes. Keep the supply decoupling tight to the ball map; the 1.7 V to 1.9 V rail has a narrow tolerance, so a local LDO or POL regulator is recommended rather than a shared bus.