DS1339U-33

GENERAL DESCRIPTION 

The DS1339 serial real-time clock(RTC) is a lowpower clock/date device with two programmable time of-day alarms and a programmable square-wave output. Address and data are transferred serially through an I 2C 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.

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)

FEATURES 

Real-Time Clock(RTC)Counts Seconds,Minutes, Hours,Day,Date,Month,and Year with LeapYear Compensation Valid Up to 2100

Available in a Surface-Mount Package with an Integrated Crystal (DS1339C)

I2C Serial Interface 

Two Time-of-Day Alarms 

Programmable Square-Wave Output 

Oscillator Stop Flag 

Automatic Power-Fail Detect and Switch Circuitry 

Trickle-Charge Capability 

Underwriters Laboratory(UL)Recognized

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