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Maxim > Products > Real-Time Clocks 
DS1339, DS1339C, DS1339U
I²C Serial Real-Time Clock

RTC Provides System Flexibility with Multiple Programmable Features


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Data Sheet
FULL DATA SHEET (PDF, 404kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

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.

Key Features   Applications/Uses
  • 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 (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

 
  		• 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)

    Key Specifications:   Timekeeping & Real-Time Clocks
    Part Number Time Format (hh = sec/100) Date Format Interface Supply Voltage (V) Time- keeping Current (typ) (nA) CL, Load Capacitance (pF) Memory Type Number of Time of Day Alarms Features RoHS Available Package Operating Temp. Range (°C) Price**
    DS1339  HH:MM:SS YY-MM-DD I2C 2
    3
    3.3
    5     		400 6 None 2
    •SOIC Package with Integrated Crystal
    •Square-Wave Output
    •Trickle Charger
    		 Yes SOIC/16
    uSOP/8     		-40 to +85 $1.12 @ 1k
    See All Timekeeping & Real-Time Clocks (86)
    Notes:
    **This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

    Application Notes
  		• Application Note 58: Crystal Considerations with Dallas Real-Time Clocks (RTCs) - DS1339, DS1339
  		• Application Note 95: Interfacing the DS1307 with an 8051-Compatible Microcontroller - DS1339
  		• Application Note 504: Design Considerations for Dallas Semiconductor Real-Time Clocks - DS1339
  		• Application Note 505: Lithium Coin-Cell Batteries: Predicting an Application Lifetime - DS1339
  		• Application Note 701: Using the DS32kHz with Dallas Real-Time Clocks - DS1339
  		• Application Note 3300: Interfacing I²C Serial Real-Time Clocks to a Microcontroller - DS1339
  		• Application Note 3517: Estimating Super Capacitor Backup Time on Trickle-Charger Real-Time Clocks - DS1339
  		• Application Note 3572: FAQ About the Integrated-Crystal Package Option - DS1339
  		• Application Note 3816: Selecting a Backup Source for Real-Time Clocks - DS1339, DS1339
  		• Application Note 3921: Using a DS1307 with a PIC Microcontroller - DS1339

    Evaluation Kits
    none

    Design Guides
  		• REAL-TIME CLOCKS (PDF)

    Reliability Reports
  		• Reliability Report: DS1339.pdf
  		• Request Reliability Report for:

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-17 of 17

    DS1339C Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1339C-2  
    		SOIC;16 pin;
    Dwg: 56-G4009-001
    Use pkgcode/variation: W16-H2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1339C-33#T&R  
    		SOIC;16 pin;
    Dwg: 56-G4009-001
    Use pkgcode/variation: W16#H2*
    		-40°C to +85°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    DS1339C-33#  
    		SOIC;16 pin;
    Dwg: 56-G4009-001
    Use pkgcode/variation: W16#H2*
    		-40°C to +85°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    DS1339C-3#  
    		SOIC;16 pin;
    Dwg: 56-G4009-001
    Use pkgcode/variation: W16#H2*
    		-40°C to +85°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    DS1339C-2#  
    		SOIC;16 pin;
    Dwg: 56-G4009-001
    Use pkgcode/variation: W16#H2*
    		-40°C to +85°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    DS1339C-33  
    		SOIC;16 pin;
    Dwg: 56-G4009-001
    Use pkgcode/variation: W16-H2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1339C-3  
    		SOIC;16 pin;
    Dwg: 56-G4009-001
    Use pkgcode/variation: W16-H2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1339U Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1339U-2+T&R  
    		uMAX;8 pin;
    Dwg: 21-0036K (PDF)
    Use pkgcode/variation: U8+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1339U-2+  
    		uMAX;8 pin;
    Dwg: 21-0036K (PDF)
    Use pkgcode/variation: U8+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1339U-33+T&R  
    		uMAX;8 pin;
    Dwg: 21-0036K (PDF)
    Use pkgcode/variation: U8+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1339U-3+T&R  
    		uMAX;8 pin;
    Dwg: 21-0036K (PDF)
    Use pkgcode/variation: U8+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1339U-3+  
    		uMAX;8 pin;
    Dwg: 21-0036K (PDF)
    Use pkgcode/variation: U8+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1339U-33+  
    		uMAX;8 pin;
    Dwg: 21-0036K (PDF)
    Use pkgcode/variation: U8+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1339U-33/T&R  
    		uMAX;8 pin;
    Dwg: 21-0036K (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1339U-33  
    		uMAX;8 pin;
    Dwg: 21-0036K (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1339U-3  
    		uMAX;8 pin;
    Dwg: 21-0036K (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1339U-2  
    		uMAX;8 pin;
    Dwg: 21-0036K (PDF)
    Use pkgcode/variation: U8-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis

    More Information
  		• New Product Press Release 2002-08-01 
  		• RTC Calculator
  		• Super Capacitor Calculator

    Related Products
    DS1337, DS1337C I²C Serial Real-Time Clock

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    2008-10-02
    This page last modified: 2008-10-02




             


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