The Renesas 71V65603S150PFG is a 9 Mbit synchronous SRAM built on Zero Bus Turnaround (ZBT) technology, organized as 256K x 36 bits. It runs at a 150 MHz clock with a 3.8 ns access time, feeding a parallel interface that eliminates the dead bus cycle between read and write operations.
3.8 ns access time at 150 MHz – timing margin in practice
The 3.8 ns access time is the delay from address assertion to data valid on the bus. At a 150 MHz clock, that leaves margin for the receiving FPGA or ASIC.
For production BOM lines, this means no near-term obsolescence risk. The package marking and date-code consistency should be verified on receipt — the 100-TQFP form factor is a known target for re-marking in the gray market, so lot traceability back to the authorized channel is worth documenting.