The CY7C1399BN-15VXC: It operates from a 3.3V supply (3V to 3.6V range) and comes in a 28-SOJ surface-mount package. This is a volatile memory — data is retained only while power is applied. Typical applications include cache buffers, scratchpad memory, and data storage in embedded systems, telecom equipment, and industrial controllers where fast, simple read/write access is needed without refresh overhead.
The SRAM presents valid data within 15 ns of the address being stable.
The CY7C1399BN-15VXC is marked obsolete by the manufacturer.
28-SOJ package — footprint and rework notes
The 28-SOJ (Small Outline J-lead) package has a body width of 7.62 mm (0.300") and uses J-bend leads on a standard SOIC pitch. It is surface-mount but the J-leads are easier to hand-solder than fine-pitch QFP or BGA — a rework station with a hot-air pencil and some flux can handle removal and replacement. The SOJ footprint is common, so PCB layout is straightforward with standard land patterns.