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BUY DS1225AD-85 https://www.utsource.net/itm/p/1047231.html
64k Nonvolatile SRAM
Description: The DS1225AD-85 is a nonvolatile static RAM (NVRAM) manufactured by Dallas Semiconductor. It is a 28-pin DIP (dual in-line package) device. Features: 256K bits of nonvolatile static RAM Low power CMOS technology Battery-backed operation Automatic write protection Low power CMOS standby mode Access times of 120 ns Data retention of 10 years Single 5V supply TTL compatible 28-pin DIP package Applications: Automotive systems Industrial controllers Portable instrumentation Data logging Battery-backed memory systems Security systems (For reference only)