DS12C887A

DS12C887A Description

Maxim

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 leapyear 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 softwaremaskable and testable
Time-of-day alarm once/second to once/day
Periodic rates from 122 s to 500ms
En-of-clock update cycle
Century register

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