Features and Benefits

  • Highly Accurate RTC with Integrated MEMS Resonator Completely Manages All Timekeeping Functions
    • Complete Clock Calendar Functionality Including Seconds, Minutes, Hours, Day, Date, Month, Year, and Century with Leap-Year Compensation Up to Year 2199
    • Timekeeping Accuracy ±5ppm (±0.432 second/day) from -40°C to 85°C
    • Two Time-of-Day Alarms
    • Temperature-Compensated Programmable Square-Wave Output
    • Uncompensated Programmable Clock Outputs
    • Automatically Switch over to Backup Battery or Supercapacitor on Power-Fail
    • Digital Temperature Sensor with ±3°C Accuracy
    • +1.6V to +5.5V Supply Voltage
  • 64-Byte RAM for User Data Storage
  • Simple Serial Interface Connects to Most Microcontrollers
    • I2C Interface
  • Battery-Backup Input for Continuous Timekeeping
  • Low-Power Operation Extends Battery-Backup Runtime
  • Operating Temperature Range: -40°C to 85°C
  • 2.1mm x 2.3mm, 8-Pin WLP Package
  • 4mm x 3mm, 8-Pin TDFN Package
  • Underwriters Laboratories® (UL) Recognized

Product Details

The MAX31343 is a low-cost, extremely accurate, I2C real-time clock (RTC). The device incorporates a battery input and maintains accurate timekeeping when main power to the device is interrupted. The integration of the microelectromechanical systems (MEMS) resonator enhances the long-term accuracy of the device and eliminates the external crystal requirement in the system. The MAX31343 is available in the 8-pin WLP and TDFN packages.

The RTC maintains seconds, minutes, hours, day, date, month, year, and century information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year up to year 2199. The clock operates in the 24-hour format. Other features including two programmable time-of-day alarms, interrupt output, uncompensated programmable clock output, and temperature-compensated programmable square-wave output. Address and data are transferred serially through an I2C bidirectional bus. A voltage reference and comparator circuit monitors the status of VCC to detect power failures and automatically switch to the backup supply when necessary. See the Typical Application Circuit for more details.


  • Action Cameras
  • Communications
  • Handheld Instrumentation
  • Industrial
  • Power Meters
  • Wearables

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.