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BUY DS1231-50 https://www.utsource.net/itm/p/713253.html
Power Supply Supervisor
Description: The DS1231-50 is a nonvolatile, low-power, 8-pin CMOS static RAM with a built-in lithium energy source and control circuitry. Features: Nonvolatile memory with a lithium energy source Low power consumption 8-pin DIP package Access time of 250ns Data retention of 10 years Automatic write protection Low standby current Low voltage operation Single +3V to +5.5V power supply Applications: Automotive systems Industrial control systems Portable instrumentation Battery-backed RAM Data logging Security systems (For reference only)