DS1287 Dallas Semiconductor, DS1287 Datasheet

DS1287

Manufacturer Part Number

DS1287

Description

Real Time Clock

Manufacturer

Dallas Semiconductor

Datasheet

1.DS1287.pdf (1 pages)

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FEATURES

DESCRIPTION

The DS1287 Real Time Clock is designed to be a direct

replacement for the MC146818A.

description of operating conditions, electrical and

Drop-in replacement for IBM AT computer clock/ca-

lendar

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

Interfaced with software as 64 RAM locations

Programmable square wave output signal

Bus-compatible interrupt signals (IRQ)

Three interrupts are separately software-maskable

and testable

– 14 bytes of clock and control registers

– 50 bytes of general purpose RAM

– Time-of-day alarm once/second to once/day

– Periodic rates from 122 s to 500 ms

– End of clock update cycle

For a complete

PIN ASSIGNMENT

PIN DESCRIPTION

AD0–AD7

MOT

R/W

RESET

IRQ

drain)

SQW

GND

mechanical characteristics, bus timing, and pin descrip-

tions see the DS12887 data sheet.

MOT

GND

24 PIN ENCAPSULATED PACKAGE

AD0

AD1

AD2

AD3

AD4

AD5

AD6

AD7

- 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

Real Time Clock

SQW

IRQ

RESET

R/W

DS1287

050898 1/1

DS1287

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