BQ3401SS

Product Details

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[ UNITRODE ]

General Description

The CMOS bq3285 is a low-power microprocessor peripheral providing a time-of- day clock and 100-year calendar with alarm features and battery operation. Other features include three maskable interrupt sources, square wave output, and 114 bytes of general nonvolatile storage.

Features

➤ 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
➤ 160ns cycle time allows fast bus operation
➤ Selectable Intel or Motorola bus timing
➤ Less than 0.5µA load under battery operation
➤ 14 bytes for clock/calendar and control
➤ BCD or binary format for clock and calendar data
➤ 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
➤ Programmable square wave output
➤ Three individually maskable interrupt event flags:
- Periodic rates from 122µs to 500ms
- Time-of-day alarm once per second to once per day
- End-of-clock update cycle
➤ 24-pin plastic DIP or SOIC