Rainbow Electronics DS1337 - Manual

1 of 15 REV: 091404
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 .
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.
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
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 mSOP
ORDERING INFORMATION
PART TEMP RANGE PIN-PACKAGE
TOP
MARK
DS1337 -40°C to +85°C 8 DIP (300 mils) DS1337
DS1337S -40°C to +85°C 8 SO (150 mils) DS1337
DS1337U -40°C to +85°C 8 mSOP 1337
DS1337C -40°C to +85°C 16 SO (300 mils) DS1337C
Pin Configurations appear at end of data sheet.
DS1337
I
2
C Serial Real-Time Clock
www.maxim-ic.com
I 2 C is a trademark of Philips Corp. Purchase of I 2 C components from
Maxim Integrated Products, Inc., or one of its sublicensed Associated
Companies, conveys a license under the Philips I
2 C Patent Rights to
use these components in an I 2 C system, provided that the system
conforms to the I 2 C Standard Specification as defined by Philips.
DS1337
CPU
V
CC
V
CC
V
CC
SDA
SCL
GND
X2 X1
V
CC
RPU RPU
CRYSTAL
SQW/ INTB
INTA i
RPU = t
R
/ C
B
i
i