633 MHz QDR II+ SRAM — what the clock rate buys you
The 633 MHz clock rate means the part delivers back-to-back read and write transactions on every rising and falling edge — effectively a 1.266 Gbps data rate per pin pair — without the bus-turnaround dead cycles that older NoBL or late-write SRAMs incur.
Cypress has placed this part in Last Buy status. That means the manufacturer has announced a final order window — once that window closes, no more units will be produced. For any design currently using this SRAM, the procurement decision is immediate: either place a last-time-buy (LTB) order to cover the remaining production run, or qualify a replacement.
This SRAM comes in a 165-ball LBGA (13x15 mm body), surface-mount only. That's a fine-pitch BGA — the balls are small and the pitch is tight. If you're planning to hand-rework this part, you'll need a hot-air station with a nozzle that covers the full array, a good stencil for reballing, and X-ray after placement to check for shorts or head-in-pillow. The 1.7V to 1.9V supply rail is narrow; make sure your power module stays inside that window under load, or the part may not initialize cleanly.