Texas Instruments

Real-Time Clock counts seconds through years in BCD format On-chip battery-backup switchover circuit with nonvolatile control for external SRAM Less than 500nA of clock operation current in backup mode Microprocessor reset valid to VCC =VSS Independent watchdog timer with a programmable time-out period Power-fail interrupt warning Programmable clock alarm interrupt active in battery-backup mode Programmable periodic interrupt Battery-low warning