DS1337
I
2
C Serial Real-Time Clock
www.maxim-ic.com
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 through an
I
2
C* 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.
FEATURES
Real-Time Clock (RTC) Counts Seconds,
Minutes, Hours, Day, Date, Month, and Year
with Leap-Year Compensation Valid Up to
2100
Available in a Surface-Mount Package with an
Integrated Crystal (DS1337C)
I
2
C 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
µSOP
-40°C to +85°C Operating Temperature Range
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, Switch, Server)
Other (Utility Meter, Vending Machine, Thermostat,
Modem)
ORDERING INFORMATION
PART
DS1337
DS1337+
DS1337S
DS1337S+
DS1337U
DS1337U+
DS1337C
DS1337C#
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 DIP (300 mils)
8 DIP (300 mils)
8 SO (150 mils)
8 SO (150 mils)
8
µSOP
8
µSOP
16 SO (300 mils)
16 SO (300 mils)
TOP
MARK†
DS1337
DS1337
DS1337
DS1337
1337
1337
DS1337C
DS1337C
TYPICAL OPERATING CIRCUIT
+ Denotes a lead-free/RoHS-compliant device.
# Denotes a RoHS-compliant device that may include lead that is
exempt under the RoHS requirements. The lead finish is JESD97
category e3, and is compatible with both lead-based and lead-free
soldering processes.
†
A “+” anywhere on the top mark denotes a lead-free device. A
“#” denotes a RoHS-compliant device.
Pin Configurations appear at end of data sheet.
*Purchase
of I C components from Maxim Integrated Products, Inc.,
or one of its sublicensed Associated Companies, conveys a license
2
2
under the Philips I C Patent Rights to use these components in an I C
2
system, provided that the system conforms to the I C Standard
Specification as defined by Philips.
2
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, go to:
1 of 15
REV: 092706
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
