Active production — no end-of-life concern
The S27KS0642GABHV020: ROHS3 compliant, so it ships without restriction into RoHS-regulated markets.
64 Mbit PSRAM with HyperBus — what the interface means for throughput
This is a 64 Mbit PSRAM (pseudo-SRAM) organized as 8M x 8 bits, using the HyperBus memory interface. HyperBus is a high-speed, low-pin-count protocol that delivers read/write throughput up to 400 MB/s at 200 MHz double-data-rate — the 200 MHz clock frequency is the base rate; the interface toggles on both edges. Access time is 35 ns, and the write cycle time for word/page operations is also 35 ns, giving deterministic latency for the controller to budget in the bus timing.
Industrial temperature range and supply voltage
The 1.7 V to 2 V supply rail means the memory runs from a low-voltage core rail — the board designer must ensure the regulator stays within that narrow window across load transients.