- Direct clock/calendar replacement for IBM? AT-compatible computers and other applications
- Functionally compatible with the DS1287/DS1287A and MC146818A/ MC146818B
- 242 bytes of general nonvolatile storage
- Provides a 32.768kHz output for power management
- System wake-up capability-alarm interrupt active in battery-backup mode
- Integral lithium cell and crystal
- 160 ns cycle time allows fast bus operation
- 14 bytes for clock/calendar and control
- Time of day in seconds, minutes, and hours
- 12- or 24-hour format
- Optional daylight saving adjustment
- Calendar in day of the week, day of the month, months, and years with automatic leap year adjustment
- Programmable square wave output
- Three individually maskable interrupt event flags:
- Periodic rates from 122us to 500ms
- Time-of-day alarm once per second to once per day
- End-of-clock update cycle
- Better than one minute per month clock accuracy
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