550 MHz QDR II+ SRAM — what the clock rate buys you
The CY7C25652KV18-550BZXI is a Cypress 72 Mbit QDR II+ synchronous SRAM clocked at 550 MHz, organized as 2M x 36. This is a high-bandwidth memory part designed for networking gear, ASIC testers, and telecom line cards where the bus needs back-to-back read and write throughput without dead cycles — QDR II+ eliminates the bus-turnaround penalty that conventional SRAMs incur.
Expect limited availability and date-code variance — any trays on the spot market are pulled from last-time-buy stock or overruns. Sourcing this part means qualifying the supplier's screening process for counterfeit risk and verifying the date code matches your assembly reflow profile (the 165-FBGA is moisture-sensitive).
The 165-FBGA (13x15 mm) footprint is a fine-pitch BGA — 1.0 mm ball pitch, 165 balls. That means a multi-layer PCB with via-in-pad or microvia escape routing is the norm.