The CY7C1021B-15VXC is a 1 Mbit asynchronous SRAM organized as 64K words by 16 bits, accessed through a parallel interface. The 44-SOJ package is surface-mount.
15 ns access time — bus timing margin for legacy controllers
Access time is 15 ns. Write cycle time is 15 ns.
Lifecycle reality — obsolete, not an active production part
The CY7C1021B-15VXC is Obsolete. No manufacturer LTB window remains.
Package and mounting — 44-SOJ surface-mount J-lead
The 44-SOJ package has a body width of 10.16 mm (0.400 inch), J-lead formed on 1.27 mm pitch, and is surface-mount soldered. Unlike a TSOP with gull-wing leads, the J-lead tucks under the body, so the solder fillet is hidden — visual inspection requires an angled mirror or X-ray. The MSL (moisture sensitivity level) is not specified in the ledger, but for a 44-SOJ from this era it is typically MSL 3 (168-hour floor life); if the original packaging seal is broken, a 24-hour bake at 125°C before reflow is prudent. The SOJ footprint is compatible with standard SOIC-44 land patterns, but the J-lead standoff is lower — ensure the solder paste stencil aperture is sized for J-lead geometry, not gull-wing.