±5ppm, I²C Real-Time Clock with SRAM

Temperature-Compensated MEMS RTC Adds Memory in Smallest of Packages

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The DS3232M is a low-cost, extremely accurate, I²C real-time clock (RTC) with 236 bytes of battery-backed SRAM. 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 reduces the piece-part count in a manufacturing line.

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 1Hz 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 microprocessor reset. See the Block Diagram in the data sheet for more details.
DS3232M: Typical Operating Circuit DS3232M: Typical Operating Circuit Enlarge+

Key Features

  • Timekeeping Accuracy ±5ppm (±0.432 Second/Day) from -40°C to +85°C
  • 236 Bytes of Battery-Backed User SRAM
  • Battery Backup for Continuous Timekeeping
  • Low Power Consumption
  • Functionally Compatible to DS3232
  • Complete Clock Calendar Functionality Including Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Up to Year 2100
  • Two Time-of-Day Alarms
  • 1Hz and 32.768kHz Outputs
  • Reset Output and Pushbutton Input with Debounce
  • Fast (400kHz) I²C-Compatible Serial Bus
  • +2.3V to +4.5V Supply Voltage
  • Digital Temp Sensor with ±3°C Accuracy
  • -40°C to +85°C Temperature Range
  • 8-Pin SO (150 mils) Package
  • Underwriters Laboratories (UL) Recognized


  • Building Automation
  • High-Definition Video Security
  • Industrial Application
  • Power Meters

See parametric specs for Timekeeping & Real-Time Clocks (78)

Part NumberInterfaceVSUPPLY
Time Keeping Current
Memory TypeMemory Size
Time of Day AlarmsIntegrated ResonatorFunctionsPackage/PinsBudgetary
typSee Notes
DS3232M I2C2.3 to 4.51800NV SRAM2362MEMsRTC
$3.72 @1k

Pricing 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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

DS3231MZEVKIT: Evaluation Kits for the DS3231M or DS3232M
DS3232MEVKIT: Evaluation Kits for the DS3231M or DS3232M
Product Reliability Reports: DS3232M.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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Related Resources

±5ppm, I2C Real-Time Clock with Integrated MEMS Oscillator

  • Highly Accurate RTC with Integrated MEMS Resonator Completely Manages All Timekeeping Functions
  • 64-Byte RAM for User Data Storage
  • Simple Serial Interface Connects to Most Microcontrollers