BQ4285

BQ4285 Description

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BQ4285 Manufacturer

BQ4285 Datasheet (PDF)

BQ4285 Price & Availability

BQ4285 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
• 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

BQ4285 Parameters

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