For existing designs already qualified on this 144Mbit QDR II+ SRAM, procurement must shift to the independent distribution channel — verified new-old-stock or surplus inventory sourced to order. Any new design-in should target an alternative QDR II+ or QDR IV device from the same family, but pin compatibility must be validated against the 165-ball BGA footprint.
144Mbit QDR II+ at 450 MHz — the throughput story
The 450 MHz clock rate delivers a peak data rate of 1.8 Gbps per I/O pin using the QDR II+ architecture — separate read and write ports on independent buses eliminate the bus-turnaround dead cycles that plague common-I/O DDR SRAM. The 36-bit data word width (32 data + 4 parity/byte-write) maps naturally to 40-bit or 36-bit network processor or FPGA interfaces in packet buffers, traffic managers, and lookup tables.
Supply rails and signal integrity
Core supply range is 1.7V to 1.9V — a 1.8V nominal rail typical of modern high-speed SRAM and low-power FPGA I/O banks. The HSTL-18 I/O standard requires a reference voltage VREF and termination voltage VTT, both derived from the 1.8V supply. Decoupling strategy should follow the Cypress/Infineon app note for QDR II+ devices: one 0.1 µF capacitor per supply pin pair, plus bulk capacitance on the board. The 165-ball FBGA (15x17 mm) uses a 1.0 mm ball pitch — route the four-layer PCB with controlled-impedance traces for the 450 MHz clock and data strobes.
Temperature grade — indoor only
This limits the part to controlled indoor environments — networking equipment in data centers, telecom central offices, or benchtop test gear. Not suitable for outdoor base stations, industrial motor drives, or automotive without active cooling that keeps the case below 70°C.