The Cypress CY7C1623KV18-250BZXC is a 144 Mbit synchronous DDR II SRAM organized as 8M x 18 bits, clocked at 250 MHz over a parallel interface. The DDR II (Double Data Rate II) architecture transfers data on both clock edges, effectively doubling the data rate without increasing the bus clock — a design choice that saves pins and board space compared to a wider QDR or NoBL part at the same throughput.
The DDR II interface transfers data on both clock edges at 250 MHz.
Cypress (now part of Infineon) has discontinued this exact speed and temperature grade.