What this part is — 18 Mbit DDR II+ SRAM at 400 MHz
The CY7C1168KV18-400BZC: It is a volatile memory with a parallel interface, designed for high-throughput buffer applications where read and write bandwidth must keep pace with a fast processor or FPGA. Typical deployment is in networking equipment, test instrumentation, and high-end compute subsystems that demand sustained random-access performance. The 165-FBGA package (13x15 mm) keeps signal paths short for the 400 MHz bus.
A 400 MHz clock in a DDR II+ SRAM means the data bus toggles at 800 million transfers per second. For an 18-bit-wide data word, that yields a peak bandwidth just over 1.8 GB/s. The system architect sizes the memory controller and PCB trace impedance to close timing at this rate — any added stub or via mismatch eats into the setup-and-hold margin.
Cypress lists the CY7C1168KV18-400BZC as obsolete. That means the manufacturer has stopped production, and no last-time-buy window remains open. New designs should not target this order code. Stock that surfaces will carry date codes from the final production lots.
Temperature grade and package — fit for controlled environments
It belongs inside an air-conditioned rack or benchtop instrument, not in an unventilated enclosure or outdoor cabinet.