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BUY DS1244Y-200 https://www.utsource.net/itm/p/367482.html
256K NV SRAM with Phantom Clock
Description: The DS1244Y-200 is a nonvolatile static RAM (NVSRAM) module from Dallas Semiconductor. It is a dual-in-line package (DIP) with a 200ns access time. Features: 200ns access time Nonvolatile static RAM (NVSRAM) Dual-in-line package (DIP) Low power CMOS technology 16K x 8 bit organization Battery backup Data retention up to 10 years Low power consumption Applications: Automotive systems Industrial automation Robotics Security systems Medical equipment Data acquisition systems Embedded systems Telecommunications (For reference only)