Memory selection memo: QDR-II SRAM at 167 MHz
The CY7C1294DV18-167BZC: It uses a parallel memory interface and is housed in a 165-LBGA package (13x15 mm). This part is a QDR-II (Quad Data Rate) device, meaning it transfers data on both edges of the clock on separate read and write ports, effectively doubling throughput per pin compared to a single-data-rate SRAM at the same clock frequency. The 167 MHz clock yields a peak data rate of 334 MHz per port, making it suited for high-bandwidth buffer applications in networking switches, base stations, and test equipment where low-latency, high-throughput memory is needed.
It is not specified for industrial or automotive environments where ambient temperatures exceed 70°C or drop below freezing. The 165-FBGA package with a 13x15 mm body and 1.0 mm ball pitch requires careful PCB layout: the BGA footprint should follow the manufacturer's recommended land pattern, and the supply decoupling caps need to sit close to the balls to keep the 1.7–1.9 V rail clean at 167 MHz.
Infineon (Cypress) no longer manufactures this part, and no successor order code is listed on the record. For existing BOM lines, the supply channel is limited to surplus and independent distribution.