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Dallas DS1287

In Stock: 15

Product Info

DALLAS DS1287 Real-Time Clock


Real Time Clock

  • Drop-in replacement for IBM AT computer clock/calendar
  • Pin compatible with the MC146818A
  • Totally nonvolatile with over 10 years of operation in the absence of power
  • Self-contained subsystem includes lithium, quartz, and support circuitry
  • Counts seconds, minutes, hours, day of the week, date, month, and year with leap year compensation
  • Binary or BCD representation of time, calendar, and alarm
  • 12- or 24-hour clock with AM and PM in 12-hour mode
  • Daylight Savings Time option
  • Selectable between Motorola and Intel bus timing
  • Multiplex bus for pin efficiency
  • nterfaced with software as 64 RAM locations
    • 14 bytes of clock and control registers
    • 50 bytes of general purpose RAM
  • Programmable square wave output signal
  • Bus-compatible interrupt signals (IRQ)
  • Three interrupts are separately software-maskable and testable
    • Time-of-day alarm once/second to once/day
    • Periodic rates from 122 µs to 500 ms
    • End of clock update cycle

(Data taken from Dallas Semiconductor DS1287 Datasheet)

NOTE: These devices contain an integrated Lithium Cell for Timekeeping and Nonvolatile RAM Operation. As these devices are second hand, the state of the lithium cell is unknown.


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