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REV: 012003

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device

may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.

GENERAL DESCRIPTION

The DS1337 serial real-time clock is a low-power

clock/calendar with two programmable time-of-day

alarms and a programmable square-wave output.

Address and data are transferred serially via a 2-wire,

bidirectional bus. The clock/calendar provides

seconds, minutes, hours, day, date, month, and year

information. The date at the end of the month is

automatically adjusted for months with fewer than 31

days, including corrections for leap year. The clock

operates in either the 24-hour or 12-hour format with

AM/PM indicator.

APPLICATIONS

Handhelds (GPS, POS Terminal, MP3 Player)

Consumer Electronics (Set-Top Box, VCR/Digital

Recording)

Office Equipment (Fax/Printer, Copier)

Medical (Glucometer, Medicine Dispenser)

Telecommunications (Router, Switcher, Server)

Other (Utility Meter, Vending Machine, Thermostat,

Modem)

FEATURES

§ Real-Time Clock (RTC) Counts Seconds,

Minutes, Hours, Day, Date, Month, and Year

with Leap-Year Compensation Valid Up to 2100

§ Two-Wire Serial Interface

§ Two Time-of-Day Alarms

§ Oscillator Stop Flag

§ Programmable Square-Wave Output

– Defaults to 32kHz on Power-Up

ORDERING INFORMATION

PART

TEMP RANGE

PIN-PACKAGE

TOP

MARK

DS1337

-40°C to +85°C

8 DIP (300mil)

DS1337

DS1337S

-40°C to +85°C

8 SO (150mil)

DS1337

DS1337U

-40°C to +85°C

8

mSOP

1337

PIN CONFIGURATIONS

DS1337

Serial Real-Time Clock

www.maxim-ic.com

www.maxim-ic.com

TYPICAL OPERATING CIRCUIT

DIP

X1

X2

GND

VCC

SCL

SDA

SQW/INTB

INTA

SO,

mSOP

X1

X2

GND

VCC

SCL

SDA

SQW/INTB

INTA

TOP VIEW

DS1337

DS1337