72 Mbit DDR II+ SRAM at 250 MHz — the bandwidth bottleneck breaker
The Cypress CY7C1518KV18-250BZXC is a 72 Mbit synchronous DDR II+ SRAM organized as 4M x 18 bits, clocked at 250 MHz. This is a volatile SRAM, so data is lost when power is removed — it's built for high-throughput buffering, not storage.
At 250 MHz, the DDR II interface transfers data on both clock edges, giving an effective 500 MT/s data rate per pin. That's the kind of bandwidth you need in a network processor lookaside buffer or a high-speed telecom line card where every nanosecond of latency matters. The 72 Mbit density (4M x 18) provides enough depth for large packet queues or lookup tables without spilling to slower DRAM.
165-FBGA package — layout and rework realities
Hand-soldering is impractical — this is a rework-station job with a hot-air nozzle and a stencil. The Tray shipping medium means it arrives in a JEDEC tray, not tape-and-reel, so factor that into your pick-and-place setup.
Obsolete — sourcing this part today
That means Cypress no longer manufactures it, and no factory orders are accepted.