15 ns asynchronous SRAM — what the access time means for bus timing
The write cycle time matches the read access at 15 ns for word and page operations.
44-TSOP II footprint and commercial temperature grade
The package is a 44-TSOP II (0.400" body width, 10.16 mm wide) — a standard surface-mount footprint for mid-density asynchronous SRAMs. The Tape & Reel (TR) shipping format feeds directly into pick-and-place lines.
The TSOP II footprint and 3.3V supply are common enough that a pin-compatible second source from another manufacturer (e.g., ISSI, Alliance Memory) may exist, but no official cross-reference is documented in the available records. Any replacement candidate must be validated for access time, supply voltage, package footprint, and temperature grade against the original design.