300 MHz QDR II — the throughput driver
The Infineon CY7C1415KV18-300BZI is a 36Mbit synchronous QDR II SRAM organized as 1M x 36, clocked at 300 MHz. That clock rate delivers a peak bandwidth of 2.4 GB/s on a single 36-bit port (double-data-rate on both read and write ports). This part is built for the memory wall in high-end networking packet buffers, telecom line cards, and test equipment where back-to-back transactions with zero dead cycles are non-negotiable. The QDR II architecture eliminates bus-turnaround cycles by dedicating separate read and write ports, so a 300 MHz clock translates directly into sustained throughput — no arbitration overhead.
That means new designs should not target this device; for existing BOM lines, the only channel is independent distribution — surplus stock, excess inventory, or broker-sourced units. If you are qualifying a replacement, look for a QDR II+ or QDR IV SRAM in the same 165-FBGA footprint and 1.7V–1.9V supply rail — but verify pin compatibility against the original layout; the QDR family has evolved its pinout across generations.
1.7V–1.9V supply and industrial temperature range
The supply range of 1.7V to 1.9V places this in the low-voltage QDR II generation, compatible with 1.8V nominal core logic. The 165-FBGA package (13x15 mm) is a fine-pitch BGA; layout needs controlled-impedance traces for the 300 MHz clock and data lines, plus adequate decoupling capacitance distributed across the ball field. No thermal pad is exposed on this package — dissipation is through the solder balls and PCB copper.