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Serial I²C bus real-time clock (RTC) with battery switchover
Serial real-time clock (RTC)
Low power dual CMOS timer
Serial SPI bus real-time clock (RTC) with battery switchover
5.0 or 3.3 V TIMEKEEPER® supervisor
Serial real-time clock (RTC) with 56 bytes of NVRAM
Low power single CMOS timer
3.0/3.3 V I²C combination real-time clock, NVRAM supervisor and microprocessor supervisor