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Product Info

ODIN OEC12C887A Real-Time Clock


Real-Time Clock (DALLAS Semiconductor Clone by ODIN)

  • Drop-in replacement for IBM AT computer clock/calendar
  • Pin compatible with the MC146818B and DS1287A
  • 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, days, day of the week, date, month, and year with leap-year compensation valid up to 2100
  • 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
  • Interfaced with software as 128 RAM locations
    • 15 bytes of clock and control registers
    • 113 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 122s to 500ms
    • En-of-clock update cycle
  • Century register

(Data taken from DALLAS Semiconductor DS12C887A 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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