The CY7C1399B-15VXI is a 256Kbit asynchronous SRAM organized as 32K x 8 bits, with a 15 ns access time and a parallel memory interface. It operates from a 3 V to 3.6 V supply and is housed in a 28-SOJ surface-mount package.
15 ns access — what it buys on the bus
A 15 ns access time means the SRAM can complete a read-to-data-valid cycle in 15 ns max. The write cycle time matches at 15 ns.
Obsolete — sourcing the CY7C1399B-15VXI today
This part is officially obsolete per Cypress (now Infineon). No last-time-buy window remains open. For a BOM line that calls out this exact order code, procurement must go to the independent surplus and broker channel. We source CY7C1399B-15VXI to order against an RFQ; availability and current pricing are confirmed at quote time. No manufacturer-direct production is available. If you are freezing a new design, look at the active 28-SOJ asynchronous SRAM family from Cypress/Infineon or ISSI — but verify pinout and timing compatibility; the 32K x 8 organization and 15 ns speed grade are the constraints.
Package and footprint — 28-SOJ
The 28-SOJ package has a 0.300 inch body width, 7.62 mm. The -40°C to 85°C rating covers most industrial enclosures.