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BUY DS12887A+ https://www.utsource.net/itm/p/4392708.html
IC RTC CLK/CALENDAR PAR 24-EDIP
Manufacturer: Dallas Package: DIP-19 Description: The DS12887A+ is a Real-Time Clock (RTC) and calendar integrated circuit. It includes a battery backup and provides a full binary coded decimal (BCD) clock/calendar plus 56 bytes of nonvolatile RAM. Features: Clock/calendar plus 56 bytes of nonvolatile RAM 24-hour or 12-hour time format with AM/PM indicator Programmable periodic interrupt Programmable square wave output Battery backup for continuous timekeeping Low power consumption Operating voltage range: 4.5V to 5.5V Applications: Personal computers Network servers Embedded systems Industrial controllers Automotive systems (For reference only)