72 Mbit QDR II SRAM at 300 MHz — the BOM-fit decision
The Cypress (now Infineon) CY7C1515JV18-300BZC is a 72 Mbit synchronous QDR II SRAM organized as 2M x 36, clocked at 300 MHz, in a 165-ball FBGA (15x17 mm) package. This part is designed for high-bandwidth, low-latency applications such as network packet buffers, telecom line cards, and test equipment where the QDR II architecture eliminates bus-turnaround dead cycles.
The 300 MHz clock rate delivers a peak data rate of 1.2 Gbps per I/O pin (DDR on both read and write ports). For a 36-bit-wide data bus, that translates to over 43 Gbps aggregate bandwidth — enough to keep a 10/40 GbE lookup engine fed without stalling. The QDR II architecture uses separate read and write ports, so the bus never needs turnaround cycles, which is critical for back-to-back throughput in content-addressable or flow-table applications. Designers should budget for controlled-impedance routing and per-pin termination on the 165-FBGA footprint to maintain signal integrity at this speed.
Obsolete — the sourcing reality
There is no listed L* successor in the available records, meaning no direct drop-in replacement is on offer from the original vendor. For production lines that still require this exact density and speed grade, procurement must go through independent distribution.