BQ3287EA

BQ3287EA Description

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BQ3287EA Datasheet (PDF)

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BQ3287EA Features

• 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

BQ3287EA Parameters

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