The 20 ns write cycle time matches the read access, so back-to-back writes at 50 MHz don't stall the bus. That matters when you're buffering real-time data or swapping context in a soft-core processor.
Package and footprint — 36-SOJ
Housed in a 36-SOJ (0.400" body width, 10.16 mm) surface-mount package, this part uses the JEDEC SOJ footprint common on 1990s–2000s embedded boards. The supplier device package is 36-SOJ, so any replacement candidate must match that mechanical outline and pinout.
Not suitable for outdoor, under-hood, or unconditioned environments. If your application sees -20°C or +85°C ambient, you need the industrial-temperature variant in this family.
For new designs, look at the current-generation asynchronous SRAMs in the same 36-SOJ footprint — many from Cypress (now Infineon) and ISSI share the pinout. No last-time-buy window remains; stock is what's in the channel.