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www.maxim-ic.com
DS1337
Serial Real-Time Clock
FEATURES
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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
Available in 8-Pin DIP, SO, or
mSOP
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.
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ORDERING INFORMATION
PART
DS1337
DS1337S
DS1337U
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 DIP (300mil)
8 SO (150mil)
8
mSOP
TOP
MARK
DS1337
DS1337
1337
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)
PIN CONFIGURATIONS
TOP VIEW
X1
X2
DS1337
INTA
GND
VCC
SQW/INTB
SCL
SDA
TYPICAL OPERATING CIRCUIT
DIP
X1
X2
INTA
GND
DS1337
VCC
SQW/INTB
SCL
SDA
SO,
mSOP
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:
1 of 13
REV: 012003
DALLAS [ DALLAS SEMICONDUCTOR ]
