72 Mbit QDR II+ at 333 MHz — the throughput ceiling for packet buffers
The CY7C25442KV18-333BZXI is a 72 Mbit synchronous SRAM organized as 2M x 36, using the QDR II+ architecture — separate read and write ports, each running double-data-rate at the 333 MHz clock. That gives a peak bandwidth of 333 MHz × 36 bits × 2 (DDR) = roughly 3 GB/s on each port, or 6 GB/s aggregate. For a line card packet buffer or a network processor lookaside memory, that throughput keeps up with 100 GbE line-rate processing without the access-cycle penalties of a shared-bus SRAM. The board designer needs a clean 1.8V rail with ±100 mV tolerance and 1% regulation across load steps; a separate LDO per device is common in dense arrays.
Industrial temp and 165-ball FBGA — the fit for outdoor or vented enclosures
The parallel interface means every address and data line is a separate ball — no serialization. The pin count is high, but the trade-off is zero latency per access; the QDR II+ port independence avoids the turnaround cycles of a common I/O bus.