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BUY DS12887 https://www.utsource.net/itm/p/11302432.html
IC RTC CLK/CALENDAR PAR 24-EDIP
Description: The DS12887 is a Real-Time Clock (RTC) and calendar integrated circuit from Maxim Integrated. Features: Battery-backed clock/calendar keeps time and date in the absence of power Binary coded decimal (BCD) clock/calendar 56-byte nonvolatile RAM Programmable periodic interrupt Programmable square-wave output 24-hour alarm Automatic power-fail detect and switch Low-power operation Operating temperature range: -40°C to +85°C Applications: Personal computers Network servers Automotive systems Industrial systems Home appliances (For reference only)