HMNR28D nvsram equivalent, timekeeper nvsram.
* INTEGRATED LOW POWER SRAM, REAL TIME CLOCK, POWER-FAIL CONTROL CIRCUIT, BATTERY and CRYSTAL
* BCD CODED YEAR, MONTH, DAY, DATE, HOURS, MINUTES, and SECONDS
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* 10 YEARS OF DATA RETENTION and CLOCK OPERATION IN THE ABSENCE OF POWER PIN and FUNCTION COMPATIBLE WITH INDUSTRY S.
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