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Maxim > Products > [Real-Time Clocks]  [Oscillators]  [Automotive] 
DS3231
Extremely Accurate I²C-Integrated RTC/TCXO/Crystal


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 372kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
Live Demo!
Industry's Most Accurate RTC
The DS3231 is a low-cost, extremely accurate I²C real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. The device incorporates a battery input, and maintains accurate timekeeping when main power to the device is interrupted. The integration of the crystal resonator enhances the long-term accuracy of the device as well as reduces the piece-part count in a manufacturing line. The DS3231 is available in commercial and industrial temperature ranges, and is offered in a 16-pin, 300-mil SO package.

The RTC maintains 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 an active-low AM/PM indicator. Two programmable time-of-day alarms and a programmable square-wave output are provided. Address and data are transferred serially through an I²C bidirectional bus.

A precision temperature-compensated voltage reference and comparator circuit monitors the status of VCC to detect power failures, to provide a reset output, and to automatically switch to the backup supply when necessary. Additionally, the active-low RST pin is monitored as a pushbutton input for generating a µP reset.

Key Features   Applications/Uses
  • Accuracy ±2ppm from 0°C to +40°C
  • Accuracy ±3.5ppm from -40°C to +85°C
  • Battery Backup Input for Continuous Timekeeping
  • Operating Temperature Ranges
    • Commercial: 0°C to +70°C
    • Industrial: -40°C to +85°C
  • Low-Power Consumption
  • Real-Time Clock Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Valid Up to 2100
  • Two Time-of-Day Alarms
  • Programmable Square-Wave Output
  • Fast (400kHz) I²C Interface
  • 3.3V Operation
  • Digital Temp Sensor Output: ±3°C Accuracy
  • Register for Aging Trim
  • Active-Low RST Output/Pushbutton Reset Debounce Input
  • Underwriters Laboratories (UL®) Recognized

  
  		• Global Positioning Systems (GPS)
  		• Servers
  		• Telematics
  		• Utility Power Meters

    Key Specifications:  Oscillator Modules
    Part Number Freq. Osc. Type Tuning Adjustment Type Freq. Output Type Frequency Stability
    (±ppm/yr)    		 Frequency Stability
    (±ppm/yr)    		 Frequency Stability
    (±ppm/yr)    		 Frequency Stability
    (±ppm)    		 VSUPPLY
    (V)    		 Price
    0 to +40°C -40 to 0°C/ +40 to +85°C vs. VCC vs. Aging See Notes
    DS3231  32.768kHz TCXO Digital CMOS Open-Drain 2 3.5 1 (typ) 5 (0-10 Years)
    2.3 to 5.5
    3
    3.3
    5
    		 $2.55 @1k
    See All Oscillator Modules (28)

    Key Specifications:  Timekeeping & Real-Time Clocks
    Part Number Date/ Time Format Interface VSUPPLY
    (V)    		 Time Keeping Current
    (nA)    		 Memory Type Time of Day Alarms Price
    hh = sec/100 typ See Notes
    DS3231  YY-MM-DD/ HH:MM:SS I2C
    2.3 to 5.5
    3
    3.3
    5
    		 840 None 2 $2.55 @1k
    See All Timekeeping & Real-Time Clocks (80)

    Diagram
    DS3231: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  		• Application Note 504: Design Considerations for Dallas Semiconductor Real-Time Clocks - DS3231
  		• Application Note 3506: Interfacing a DS3231 with an 8051-Type Microcontroller - DS3231
  		• Application Note 3572: FAQ About the Integrated-Crystal Package Option - DS3231
  		• Application Note 3644: Power Considerations for Accurate Real-Time Clocks - DS3231
  		• Application Note 3816: Selecting a Backup Source for Real-Time Clocks - DS3231

    Design Guides
  		• Thermal Management (PDF)
  		• Real-Time Clocks (PDF)
  		• System Timing & Control (PDF)

    Reliability Reports
  		• Reliability Report: DS3231.pdf
  		• Underwriters Laboratories (UL®) Recognized

    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: 1-8 of 8

    DS3231 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS3231S  
    		Active SOIC(W);16 pin;111 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0107 (PDF)
    Use pkgcode/variation: W16-H2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS3231S/T&R    
    		Active SOIC(W);16 pin;111 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0107 (PDF)
    Use pkgcode/variation: W16-H2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS3231S#  
    		Active SOIC(W);16 pin;111 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0107 (PDF)
    Use pkgcode/variation: W16#H2*
    		0°C to +70°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    DS3231S#T&R    
    		Active SOIC(W);16 pin;111 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0107 (PDF)
    Use pkgcode/variation: W16#H2*
    		0°C to +70°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    DS3231SN  
    		Active SOIC(W);16 pin;111 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0107 (PDF)
    Use pkgcode/variation: W16-H2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS3231SN/T&R    
    		Active SOIC(W);16 pin;111 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0107 (PDF)
    Use pkgcode/variation: W16-H2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS3231SN#  
    		Active SOIC(W);16 pin;111 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0107 (PDF)
    Use pkgcode/variation: W16#H2*
    		-40°C to +85°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    DS3231SN#T&R    
    		Active SOIC(W);16 pin;111 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0107 (PDF)
    Use pkgcode/variation: W16#H2*
    		-40°C to +85°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis

    More Information
  		• New Product Press Release 2005-04-12 
  		• Product Ad: Download

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    2008-11-12
    This page last modified: 2009-01-19


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