Direct clock/calendar replacement for IBM® AT-compatible computers and other applications
Functionally compatible with the DS1285
- Closely matches MC146818A pin configuration
114 bytes of general nonvolatile storage
Automatic backup and write-protect control to external SRAM
160 ns cycle time allows fast bus operation
Less than 0.5µA load under battery operation
14 bytes for clock/calendar and control
Calendar in day of the week, day of the month, months, and years, with automatic leap-year adjustment
Time of day in seconds, minutes, and hours
- 12- or 24-hour format
- Optional daylight saving adjustment
BCD or binary format for clock and calendar data
Programmable square wave out-put
Three individually maskable interrupt event flags:
- Periodic rates from 122 us to 500 ms
- Time-of-day alarm once per second to once per day
- End-of-clock update cycle
24-pin plastic DIP or SOIC

BQ4285S-SB2 Parameters

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