DS1283S Maxim Integrated Products, DS1283S Datasheet

DS1283S

Manufacturer Part Number

DS1283S

Description

Real Time Clock

Manufacturer

Maxim Integrated Products

Datasheet

1.DS1283S.pdf (27 pages)

Specifications of DS1283S

Function

Clock, Calendar, NV Timekeeping RAM, Alarm

Package / Case

SOIC-28

Time Format

HH:MM:SS:hh

Rtc Memory Size

50 B

Supply Voltage (max)

5.5 V

Supply Voltage (min)

2.5 V

Mounting Style

SMD/SMT

Rtc Bus Interface

Parallel

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The DS12885, DS12887, and DS12C887 real-time

clocks (RTCs) are designed to be direct replacements

for the DS1285 and DS1287. The devices provide a

real-time clock/calendar, one time-of-day alarm, three

maskable interrupts with a common interrupt output, a

programmable square wave, and 114 bytes of battery-

backed static RAM (113 bytes in the DS12C887 and

DS12C887A). The DS12887 integrates a quartz crystal

and lithium energy source into a 24-pin encapsulated

DIP package. The DS12C887 adds a century byte at

address 32h. For all devices, the date at the end of the

month is automatically adjusted for months with fewer

than 31 days, including correction for leap years. The

devices also operate in either 24-hour or

12-hour format with an AM/PM indicator. A precision

temperature-compensated circuit monitors the status of

automatically switches to a backup supply. A lithium

coin-cell battery can be connected to the V

pin on the DS12885 to maintain time and date operation

when primary power is absent. The device is accessed

through a multiplexed byte-wide interface, which sup-

ports both Intel and Motorola modes.

Rev 0; 6/05

Pin Configurations and Ordering Information appear at end of data sheet.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

. If a primary power failure is detected, the device

Embedded Systems

Utility Meters

Security Systems

Network Hubs, Bridges, and Routers

DS83C520

Typical Operating Circuit

General Description

R/W

AD(0–7)

IRQ

MOT

CRYSTAL

DS12885

GND

Applications

______________________________________________ Maxim Integrated Products

RESET

RCLR

SQW

BAT

input

♦ Drop-In Replacement for IBM AT Computer

♦ RTC Counts Seconds, Minutes, Hours, Day, Date,

♦ Binary or BCD Time Representation

♦ 12-Hour or 24-Hour Clock with AM and PM in

♦ Daylight Saving Time Option

♦ Selectable Intel or Motorola Bus Timing

♦ Interfaced with Software as 128 RAM Locations

♦ 14 Bytes of Clock and Control Registers

♦ 114 Bytes of General-Purpose, Battery-Backed

♦ RAM Clear Function (DS12885, DS12887A, and

♦ Interrupt Output with Three Independently

♦ Time-of-Day Alarm Once Per Second to Once

♦ Periodic Rates from 122µs to 500ms

♦ End-of-Clock Update Cycle Flag

♦ Programmable Square-Wave Output

♦ Automatic Power-Fail Detect and Switch Circuitry

♦ Optional 28-Pin PLCC Surface Mount Package or

♦ Optional Encapsulated DIP (EDIP) Package with

♦ Optional Industrial Temperature Range Available

♦ Underwriters Laboratory (UL) Recognized

Clock/Calendar

Month, and Year with Leap Year Compensation

Through 2099

12-Hour Mode

RAM (113 Bytes in the DS12C887 and

DS12C887A)

Maskable Interrupt Flags

Per Day

32-Pin TQFP (DS12885)

Integrated Crystal and Battery (DS12887,

DS12887A, DS12C887, DS12C887A)

Real-Time Clock

Features

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