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BUY DS12887 https://www.utsource.net/itm/p/1891300.html
Real Time Clock
Description: The DS12887 is a Real-Time Clock (RTC) and calendar integrated circuit from Dallas/Maxim. Features: * Clock/calendar provides seconds, minutes, hours, day, date, month, and year information * Valid up to year 2100 * Programmable periodic interrupt * Programmable square wave output * Battery backup for continuous timekeeping * 24-hour or 12-hour format Applications: * Automotive * Industrial * Medical * Networking * Telecommunications (For reference only)