DS1339 I²C Serial Real-Time Clock0 pages

DS1339
I2C Serial Real-Time Clock
GENERAL DESCRIPTION

BENEFITS AND FEATURES

The DS1339 serial real-time clock (RTC) is a lowpower clock/date device with two programmable timeof-day alarms and a programmable square-wave
output. Address and data are transferred serially
2
through an I C bus. The clock/date 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 DS1339 has a built-in powersense circuit that detects power failures and
automatically switches to the backup supply,
maintaining time, date, and alarm operation.

Completely Manages All Timekeeping
Functions
o Real-Time Clock Counts Seconds,
Minutes, Hours, Date of the Month,
Month, Day of the
Week, and Year with Leap-Year
Compensation Valid Up to 2100
o 56-Byte, Battery-Backed, GeneralPurpose RAM with Unlimited Writes
o Programmable Square-Wave Output
Signal

Simple Serial Port Interfaces to Most
Microcontrollers
o I2C Serial Interface

Low Power Operation Extends Battery
Backup Run Time
o Consumes Less than 500nA in
Battery-Backup Mode with Oscillator
Running
o Automatic Power-Fail Detect and
Switch Circuitry

8-Pin DIP and 8-Pin SO Minimizes
Required Space

Optional Industrial Temperature Range:
-40°C to +85°C Supports Operation in a
Wide Range of Applications

Underwriters Laboratories® (UL)
Recognized

APPLICATIONS
Handhelds (GPS, POS Terminals)
Consumer Electronics (Set-Top Box, Digital
Recording, Network Appliance)
Office Equipment (Fax/Printers, Copier)
Medical (Glucometer, Medicine Dispenser)
Telecommunications (Routers, Switches, Servers)
Other (Utility Meter, Vending Machine, Thermostat,
Modem)

Pin Configurations appear at end of data sheet.

ORDERING INFORMATION
PART
DS1339C-2#
DS1339C-3#
DS1339C-33#
DS1339U-2+
DS1339U-3+
DS1339U-33+

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

VOLTAGE (V)
2.0
3.0
3.3
2.0
3.0
3.3

PIN-PACKAGE
16 SO (300 mils)
16 SO (300 mils)
16 SO (300 mils)
8 µSOP
8 µSOP
8 µSOP

TOP MARK†
DS1339C-2
DS1339C-3
DS1339C-33
1339 rr-2
1339 rr-3
1339 rr-33

+Denotes a lead(Pb)-free/RoHS-compliant package.
#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 indicates a lead(Pb)-free device. A “#” denotes a RoHS-compliant device. rr = second line, revision code

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