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BUY DS1225AB-150 https://www.utsource.net/itm/p/620495.html
64k Nonvolatile SRAM
Description: The DS1225AB-150 is a non-volatile static RAM (NVRAM) from Dallas Semiconductor. It is a 28-pin DIP package with a 150ns access time. Features: 32K x 8 bit non-volatile static RAM 150ns access time Low power CMOS technology Automatic write protection Low power standby mode Battery backup TTL compatible inputs and outputs 28-pin DIP package Applications: Automotive systems Industrial control systems Data logging Data acquisition Instrumentation Robotics Security systems (For reference only)