The Cypress CY7C1564XV18-366BZXC is a 72Mbit synchronous SRAM using the QDR II+ architecture — double-data-rate read and write on separate I/O ports, eliminating bus-turnaround dead cycles. Organized 2M x 36, it clocks at 366 MHz, giving a peak bandwidth of about 14.7 Gbps on a 36-bit bus. The 1.7V to 1.9V core supply keeps I/O levels in the 1.8V range, matching low-voltage FPGA and ASIC interfaces. This part is built for high-throughput, low-latency lookup tables, packet buffers, and cache memory in networking switches, baseband processors, and test equipment — applications where every nanosecond of read-to-write turnaround matters.
At 366 MHz, the QDR II+ interface delivers back-to-back transactions without idle cycles between read and write. For a system moving 36-bit words, that translates to roughly 1.46 GWords/s peak. The timing closure challenge is real — the 165-ball FBGA footprint (13x15 mm) needs careful signal-integrity layout, with matched trace lengths and adequate decoupling right at the BGA balls.
This means Cypress (now Infineon) has stopped production; there is no active last-time-buy window. For new designs, a current-generation QDR II+ or QDR IV SRAM from the same vendor would be the natural migration path, but that requires a board respin and timing revalidation.
The 165-LBGA (supplier device package 165-FBGA, 13x15 mm) is a fine-pitch BGA.