It clocks at 400 MHz, delivering back-to-back read and write transactions on separate buses without dead cycles — the defining feature of the QDR family. It comes in a 165-ball FBGA (13x15 mm) package, surface-mount only. This density and speed target networking gear — switches, routers, and base stations — where large lookup tables, packet buffers, or statistics counters need deterministic, high-throughput access.
Obsolete — last-time-buy has passed
The manufacturer has marked the CY7C2565KV18-400BZI as Obsolete. Any available stock is surplus or broker-channel material, and date-code provenance matters — verify the parts are genuine and within the original factory shelf life.
400 MHz clock — timing closure and bus margin
At 400 MHz, the bus cycle time is 2.5 ns. The QDR II+ architecture uses separate read and write data ports, each clocked on both edges, so the effective data rate is 800 Mbps per pin. That puts tight demands on the PCB layout — controlled impedance, matched trace lengths, and clean supply decoupling within 1.7V to 1.9V.
Industrial temperature grade — outdoor and enclosure environments
The 1.7V to 1.9V core supply aligns with 1.8V-class FPGA I/O banks, which is the typical host interface for QDR SRAM in a networking design.