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BUY DS1487MX https://www.utsource.net/itm/p/11655450.html

Description: The DS1487MX is a 4Kb nonvolatile SRAM with a built-in real-time clock/calendar and a lithium energy source. Features: 4Kb nonvolatile SRAM Built-in real-time clock/calendar Lithium energy source Low power consumption Wide operating voltage range (2.2V to 5.5V) Low voltage detect Power-on reset Data retention of 10 years Single-supply operation Applications: Automotive Industrial Medical Security Telecommunications (For reference only)