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DS1285
Real Time Clock
DS1285/DS1285QReal Time Clock
DS1285/DS1285Q
050898 1/1
FEATURES Drop-in replacement for IBM AT computer clock/ca-
lendarPin configuration closely matches MC146818ACounts seconds, minutes, hours, day of the week,
date, month, and year with leap year compensationBinary or BCD representation of time, calendar, and
alarm12- or 24-hour clock with AM and PM in 12-hour modeDaylight Savings Time optionSelectable between Motorola and Intel bus timingMultiplex bus for pin efficiencyInterfaced with software as 64 RAM locations14 bytes of clock and control registers50 bytes of general purpose RAMProgrammable square wave output signalBus compatible interrupt signals (IRQ)
and testableTime-of-day alarm once/second to once/dayPeriodic rates from 122 μs to 500 msEnd of clock update cycleOptional 28-pin PLCC surface mount package
DESCRIPTIONThe DS1285 Real Time Chip is a direct replacement for
the MC146818A in IBM AT computer clock/calendar
and other applications. For a complete description of
operating conditions, electrical and mechanical charac-
teristics, bus timing, and pin descriptions see the
DS12885 data sheet.
PIN ASSIGNMENTDS1285 24–PIN DIP
MOT
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
RCLR
VBAT
IRQ
RESET
GND
R/W
DS1285Q 28-PIN PLCCMOTVCC
SQW
AD6AD7
GND131415161718
AD0
AD1
AD2
AD3
AD4
AD5
PIN DESCRIPTIONAD0-AD7–Multiplexed Address/Data Bus –No Connection
MOT–Bus Type Selection –Chip Select –Address Strobe
R/W–Read/Write Input –Data Strobe
RESET–Reset Input
IRQ–Interrupt Request Output (open drain)
SQW–Square Wave Output
VCC–+5 Volt Supply
GND–Ground
X1,X2–32.768 KHz Crystal Connections
VBAT–+3 Volt Battery Input
RCLR–RAM Clear
This datasheet has been :
www.ic-phoenix.com
Datasheets for electronic components.
