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DS1287A Dataheets PDF



Part Number DS1287A
Manufacturers Dallas Semiconductor
Logo Dallas Semiconductor
Description Real Time Clock
Datasheet DS1287A DatasheetDS1287A Datasheet (PDF)

DS1287A DS1287A Real Time Clock FEATURES www.DataSheet4U.com PIN ASSIGNMENT MOT NC NC AD0 AD1 AD2 AD3 AD4 AD5 AD6 AD7 GND 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VCC SQW NC RCLR NC IRQ RESET DS NC R/W AS CS • 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 • Counts subsystem includes lithium, quartz, and support circuitry seconds,.

  DS1287A   DS1287A



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DS1287A DS1287A Real Time Clock FEATURES www.DataSheet4U.com PIN ASSIGNMENT MOT NC NC AD0 AD1 AD2 AD3 AD4 AD5 AD6 AD7 GND 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VCC SQW NC RCLR NC IRQ RESET DS NC R/W AS CS • 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 • Counts subsystem includes lithium, quartz, and support circuitry seconds, minutes, hours, day of the week, date, month, and year with leap year compensation alarm • Binary or BCD representation of time, calendar, and • 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 64 RAM locations – 14 bytes of clock and control registers – 50 bytes of general purpose RAM 24 PIN ENCAPSULATED PACKAGE PIN DESCRIPTION AD0–AD7 NC MOT CS AS R/W DS RESET IRQ drain) SQW VCC GND RCLR Multiplexed address/data bus No connection Bus type selection Chip select Address strobe Read/write input Data strobe Reset input Interrupt request output (open Square wave output +5 volt supply Ground RAM clear • 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 ms to 500 ms – End of clock update cycle DESCRIPTION The DS1287A is identical to the DS1287 with the addition of the RAM clear pin. For a complete description of operating conditions, electrical and mechanical characteristics, bus timing, and pin descriptions see the DS12887A data sheet. 022798 1/1 .


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