10 ns asynchronous SRAM for timing-critical byte-wide buses
The parallel interface and 3V to 3.6V supply mean this part fits into a 3.3 V memory bus without level translation, provided the controller also runs at that rail.
Obsolete — plan for last-time-buy or alternate sourcing
That means the manufacturer no longer accepts orders for this exact order code, and no further production runs are scheduled.
Package and supply — what the 54-TSOP II means for the board
The 54-TSOP II (0.400", 10.16 mm width) is a standard thin small-outline package for high-density SRAMs. It is surface-mount and reflow-compatible, but the 54-pin count and 0.5 mm pitch call for careful solder-paste stencil design — a 125 µm stencil thickness is typical for this pitch. Decoupling with a 100 nF ceramic per supply pin pair, placed within 2 mm of the package, keeps switching noise under the 10 ns access-time window.