BQ3287 Datasheet

Direct clock/calendar replacement for IBM? AT-compatible computers and other applications
Functionally compatible with the DS1287/DS1287A and MC146818A
114 bytes of general nonvolatile storage
Integral lithium cell and crystal
160 ns cycle time allows fast bus operation
Selectable Intel or Motorola bus timing
14 bytes for clock/calendar and control
BCD or binary format for clock and calendar data
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

BQ3287