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I²C Serial Real-Time Clock

RTC Provides System Flexibility with Multiple Programmable Features

Product Details

Key Features

Parametric specs for Timekeeping & Real-Time Clocks
Interface I2C
VSUPPLY (V) 1.8 to 5.5
Date/ Time Format (hh = sec/100) YY-MM-DD/ HH:MM:SS
Time Keeping Current (nA) (typ) 400
CL (pF) 6
Memory Type None
Time of Day Alarms 2
Package/Pins SOIC (W)/16
UMAX/8
Budgetary
Price (See Notes)
1.76
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Simplified Block Diagram

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Parameters

Parametric specs for Timekeeping & Real-Time Clocks
Interface I2C
VSUPPLY (V) 1.8 to 5.5
Date/ Time Format (hh = sec/100) YY-MM-DD/ HH:MM:SS
Time Keeping Current (nA) (typ) 400
CL (pF) 6
Memory Type None
Time of Day Alarms 2
Package/Pins SOIC (W)/16
UMAX/8
Budgetary
Price (See Notes)
1.76

Key Features

  • Completely Manages All Timekeeping Functions
    • 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
    • Two Time-of-Day Alarms
    • Programmable Square-Wave Output
    • Oscillator Stop Flag
  • Interfaces to Most Microcontrollers
    • I2C Serial Interface
  • Low-Power Operation Extends Battery Backup Run Time
    • Automatic Power-Fail Detect and Switch Circuitry
    • Trickle-Charge Capability
  • Underwriters Laboratories® (UL) Recognized
  • Surface-Mount Package with an Integrated Crystal (DS1339C Saves Additional Space and Simplifies Design

Applications/Uses

  • Consumer Electronics (Set-Top Box, Digital Recording, Network Appliance)
  • Handhelds (GPS, POS Terminal)
  • Medical (Glucometer, Medicine Dispenser)
  • Office Equipment (Fax/Printer, Copier)
  • Other (Utility Meter, Vending Machine, Thermostat, Modem)
  • Telecommunications (Router, Switcher, Server)

Description

The DS1339 serial real-time clock (RTC) is a low-power clock/date device 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/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 power-sense circuit that detects power failures and automatically switches to the backup supply, maintaining time, date, and alarm operation.

Simplified Block Diagram

DS1339, DS1339C, DS1339U: Typical Operating Circuit DS1339, DS1339C, DS1339U: Typical Operating Circuit Zoom icon

Support & Training

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Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .