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DS3234
Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM

Completely Integrated, Accurate Timing Solution Provides Better than ±2.0 Minutes per Year Accuracy Over the Industrial Temperature Range and Requires No User Calibration


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Data Sheet
FULL DATA SHEET (PDF, 300kB)
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Description
The DS3234 is a low-cost, extremely accurate SPI™ bus real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. The DS3234 incorporates a precision, temperature-compensated voltage reference and comparator circuit to monitor VCC. When VCC drops below the power-fail voltage (VPF), the device asserts the active-low RST output and also disables read and write access to the part when VCC drops below both VPF and VBAT. The active-low RST pin is monitored as a pushbutton input for generating a µP reset. The device switches to the backup supply 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 DS3234 is available in commercial and industrial temperature ranges, and is offered in an industry-standard 300-mil, 20-pin SO package.

The DS3234 also integrates 256 bytes of battery-backed SRAM. In the event of main power loss, the contents of the memory are maintained by the power source connected to the VBAT pin. 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 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 by an SPI bidirectional bus.

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 2099
  • Two Time-of-Day Alarms
  • Programmable Square-Wave Output
  • 4MHz SPI Bus Supports Modes 1 and 3
  • Digital Temp Sensor Output: ±3°C Accuracy
  • Register for Aging Trim
  • Active-Low RST Input/Output
  • 300-Mil, 20-Pin SO Package
  • Underwriters Laboratories (UL®) Recognized

 
  • GPS
  • Servers
  • Telematics
  • Utility Power Meters

    Key Specifications:   Oscillator Modules
    Part Number Frequency Oscillator Type Tuning Adjustment Type Frequency Output Type Freq. Stability vs. Temp. @0 to +40°C (±ppm) Freq. Stab. vs.Temp. @-40 to 0/ +40 to 85°C (±ppm) Frequency Stability vs. Supply Voltage (±ppm/V) Frequency Stability vs. Aging (±ppm) Supply Voltage (V) Price**
    DS3234  32.768kHz TCXO Digital CMOS Push-Pull 2 3.5 1 (typ) 5 (0-10 Years) 2.7 to 5.5
    3
    3.3
    5
    $2.62 @ 1k
    See All Oscillator Modules (28)

    Key Specifications:   Timekeeping & Real-Time Clocks
    Part Number Date/ Time Format (hh = sec/100) Interface Supply Voltage (V) Time- keeping Current (typ) (nA) Memory Type Memory Size (Bytes) Number of Time of Day Alarms Price**
    DS3234  YY-MM-DD/ HH:MM:SS SPI 2.7 to 5.5
    3
    3.3
    5
    1,500 NV SRAM 256 2 $2.62 @ 1k
    See All Timekeeping & Real-Time Clocks (85)
    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 502: Interfacing SPI Real-Time Clocks (RTCs) with a Microcontroller - DS3234
  • Application Note 504: Design Considerations for Dallas Semiconductor Real-Time Clocks - DS3234
  • Application Note 3572: FAQ About the Integrated-Crystal Package Option - DS3234
  • Application Note 3644: Power Considerations for Accurate Real-Time Clocks - DS3234
  • Application Note 3816: Selecting a Backup Source for Real-Time Clocks - DS3234
  • Application Note 4005: Interfacing a DS3234 Extremely Accurate SPI-Bus Real-Time Clock (RTC) to a Motorola Digital Signal Processor (DSP) - DS3234

    Evaluation Kits
    none

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

    Reliability Reports
  • Reliability Report: DS3234.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: 1-2 of 2

    DS3234 Free
    Sample
    Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    DS3234S#  
    SOIC(W);20 pin;137 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0108 (PDF)
    Use pkgcode/variation: W20#H2*
    0°C to +70°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    DS3234SN#  
    SOIC(W);20 pin;137 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0108 (PDF)
    Use pkgcode/variation: W20#H2*
    -40°C to +85°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis

    More Information
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    Related Products
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    DS32kHz 32.768kHz Temperature-Compensated Crystal Oscillator

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    2008-11-13
    This page last modified: 2008-11-14


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