72 Mbit QDR II+ SRAM at 450 MHz — what it does
The 450 MHz clock rate lets the device sustain back-to-back read and write operations without the dead cycles that plague conventional burst SRAM — the QDR II+ bus-turnaround scheme eliminates the idle clock between read and write direction changes.
No direct replacement or successor order code is listed in the official record. For existing BOM lines, procurement must turn to the surplus and broker channel. If you are freezing a BOM or planning a long production run, securing a last-time-buy or qualifying a pin-compatible alternative from the same QDR II+ family should be on your near-term list.