72 Mbit QDR II+ SRAM at 400 MHz — what the clock buys you
The CY7C25652KV18-400BZXI is a 72 Mbit synchronous QDR II+ SRAM organized as 2M x 36. The 400 MHz clock rate means the memory delivers a peak data rate of 1.6 Gbps per I/O pin using the quad-data-rate architecture — two read and two write ports per clock cycle. This suits high-throughput applications like network packet buffers, line cards, and test equipment where the SRAM must keep up with the ASIC or FPGA without wait states.
Industrial temperature and supply tolerance
The 1.7 V to 1.9 V supply rail gives the board designer headroom: a 1.8 V nominal rail with ±5 % tolerance stays within the operating window, and the core logic is compatible with 1.8 V I/O standards common in high-performance FPGAs and network processors.
Supplied in a 165-ball LBGA (13x15 mm FBGA), the 1.0 mm ball pitch requires a standard 4-layer or 6-layer PCB with via-in-pad for the inner rows. The footprint is identical to other 165-ball QDR II+ SRAMs from Cypress/Infineon, so a single board layout can accommodate density upgrades without a respin. The tray packaging is typical for volume assembly — no reel, so plan for pick-and-place feeder changeover.