72 Mbit DDR II SRAM at 250 MHz — what it does in the system
It clocks at 250 MHz, transferring data on both rising and falling edges of the clock for an effective 500 MT/s data rate on the 18-bit bus.
250 MHz clock and 4M x 18 organization — bus timing and memory depth
At 250 MHz the DDR II interface delivers back-to-back read/write transactions with no dead cycles between bursts, critical for pipelined data paths in FPGA-attached or ASIC-attached memory controllers. The 4M x 18 organization gives 4 million addressable locations, each 18 bits wide — a natural fit for 16-bit data words plus two parity or tag bits.
Infineon lists the CY7C1523KV18-250BZXC as Obsolete.
Supplied in a 165-ball LBGA, the supplier device package is a 165-FBGA measuring 13 mm by 15 mm. Surface-mount only. The fine-pitch BGA requires controlled impedance routing and matched trace lengths for the 250 MHz DDR interface.