The Cypress CY7C1399BNL-15ZXCT is a 256Kbit asynchronous SRAM organized as 32K x 8, with a 15 ns access time and a parallel memory interface. It operates from a 3 V to 3.6 V supply and is rated for the commercial temperature range of 0°C to 70°C. This part is housed in a 28-TSSOP surface-mount package (0.465" body width, 11.80 mm width) and is supplied on Tape & Reel. Typical applications include cache memory, buffer storage, and general-purpose data buffering in embedded systems, telecom equipment, and office electronics where fast, byte-wide random access is needed.
15 ns access time — what it means for the bus
The 15 ns access time and write cycle time match, allowing back-to-back writes without wait states.
Temperature grade limits deployment
The 0°C to 70°C commercial temperature range restricts this part to indoor, climate-controlled environments. It is not rated for industrial enclosures, automotive cabins, or outdoor telecom cabinets where ambient temperatures can exceed 70°C. If the application sees extended temperature, a different SRAM with an industrial or automotive temperature grade is required.