DS1337_09 Datasheet, PDF (1/16 Pages) Maxim Integrated Products – I2C Serial Real-Time Clock

19-4652; 7/09
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
I²C 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.
The device is fully accessible through the serial
interface while V_CC is between 1.8V and 5.5V. I²C
operation is not guaranteed below 1.8V.
Timekeeping operation is maintained with V_CC as low
as 1.3V.
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)
TYPICAL OPERATING CIRCUIT
DS1337
I²C Serial Real-Time Clock
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)
 I²C 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 SOP
 -40C to +85C Operating Temperature Range
ORDERING INFORMATION
PART
DS1337+
DS1337S+
DS1337U+
DS1337C#
TEMP RANGE
-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 SO (150 mils)
8 SOP
16 SO (300 mils)
TOP
MARK†
DS1337
DS1337
1337
DS1337C
+ Denotes a lead(Pb)-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.
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: www.maxim-ic.com/errata.
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