DS3232M:±5ppm, I²C Real-Time Clock with SRAM

Temperature-Compensated MEMS RTC Adds Memory in Smallest of Packages

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.

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
DS3232M: Typical Operating Circuit
DS3232M: Typical Operating Circuit
  • Building Automation
  • High-Definition Video Security
  • Industrial Application
  • Power Meters
titleDownload file
DS3232M Data SheetDS3232M.pdf
Errata DS3232MDS3232M_A1.pdf
Part NumberInterfaceVSUPPLY
Time Keeping Current
Memory TypeMemory Size
Time of Day AlarmsIntegrated ResonatorFunctionsPackage/PinsBudgetary
typSee Notes
DS3232MI2C2.3 to 4.51800NV SRAM2362MEMsRTCSOIC(N)/8$3.54 @1k
Design kits & evaluation modules
Quality and Environmental Data
Related Products
  • DS3231M:±5ppm, I2C Real-Time Clock
  • DS3234:Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM
  • DS3232:Extremely Accurate I²C RTC with Integrated Crystal and SRAM
  • DS3231:Extremely Accurate I²C-Integrated RTC/TCXO/Crystal
  • DS32KHZ:32.768kHz Temperature-Compensated Crystal Oscillator
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
DS3232MZ+ActiveSOIC(N),;8 pin;31 mm²-40°C to +85°CLead Free
DS3232MZ+TRLActiveSOIC(N),;8 pin;31 mm²-40°C to +85°CLead Free
DS3232MZ/V+NRNDSOIC(N),;8 pin;31 mm²-40°C to +85°CLead Free
DS3232MZ/V+TNRNDSOIC(N),;8 pin;31 mm²-40°C to +85°CLead Free
DS3232M.pdf DS3232M
DS3232M_cn.pdf DS3232M
DS3232M_A1.pdf DS3232M
DS3232M.pdf DS3232M
DS3232M.pdf DS3232M
Tips for Writing Bulletproof Real-Time Clock Control Code DS3234
Industry Turns to MEMS for Accurate Real-Time Clocks DS3234
MEMS Technology Provides Tangible Benefits for Real-Time Clocks DS3232M
Stuxnet and Other Things that Go Bump in the Night MAX2992
State Machine Logic in Binary-Coded Decimal (BCD)-Formatted Real-Time Clocks DS3234
Implementing Flawless Designs with Accurate I²C Real-Time Clocks DS3234
Selecting a Backup Source for Real-Time Clocks DS3234
Design Considerations for Maxim Real-Time Clocks DS3234
DS3232M.pdf DS3232M
DS3232M_A1.pdf DS3232M