The CY7C1021BN-12VXI is a 1Mbit asynchronous SRAM organized as 64K x 16 bits, with a parallel interface and a 12 ns access time. The part comes in a 44-SOJ surface-mount package, shipped in tubes.
12 ns access time and 16-bit bus — timing and fit
The 12 ns access time sets the read-cycle window for the memory bus — a slower part would miss the data-valid window on a legacy controller that expects 12 ns or faster. The 64K x 16 organization gives a full 16-bit data bus, which matches 16-bit microcontrollers and DSPs without byte-lane muxing.
Infineon lists the CY7C1021BN-12VXI as Obsolete.
Package and storage note
The 44-SOJ package (0.400-inch body width, 10.16 mm) is a surface-mount footprint with J-bend leads. Store the tubes dry — the SOJ body is not moisture-sensitive per JEDEC Level 1, but the leads are tin-plated and benefit from a dry environment to avoid oxidation before reflow.