Total-Elapsed-Time Recorder with Alarm

Industry's First Crystal-less Elapsed Time Counter


The DS1682 is an integrated elapsed-time recorder containing a factory-calibrated, temperature-compensated RC time base that eliminates the need for an external crystal. Using EEPROM technology to maintain data in the absence of power, the DS1682 requires no backup power source. The DS1682 detects and records the number of events on the EVENT pin and the total cumulative event time since the DS1682 was last reset to 0. The active-low ALARM pin alerts the user when the total time accumulated equals the user-programmed alarm value. The polarity of the open-drain active-low ALARM pin can be programmed to either drive low or to become high impedance upon an alarm condition. The DS1682 is ideal for applications that monitor the total amount of time that a device has been in operation and/or the number of uses since inception of service, repair, or the last calibration.
DS1682: Block Diagram DS1682: Block Diagram Enlarge+

Key Features

  • Records the Total Time that the Event Input has Been Active and the Number of Events that have Occurred
  • 32-Bit, Nonvolatile, Elapsed Time Counter (ETC) Monitors Event Duration with Quarter-Second Resolution and Provides 34 Years of Total Time Accumulation
  • Programmable Elapsed Time Active-Low ALARM Output
  • Nonvolatile 17-Bit Event Counter Records the Total Number of Times an Event has Occurred
  • Calibrated, Temperature-Compensated RC Time Base Accurate to 2% Typical
  • 10 Bytes of EEPROM User Memory
  • Write Disable Function to Prevent the Memory from Being Changed or Erased
  • 2-Wire Serial Communication
  • Wide 2.5V to 5.5V Power-Supply Range
  • Useful in Time-of-Use Warranty, Calibration, Repair, and Maintenance Applications


  • Any System Where Time-of-Use is Important (Warranty Tracking)
  • High-Temp, Rugged, Industrial Applications Where Vibration or Shock Could Damage a Quartz Crystal
Part Number Interface VSUPPLY
Memory Type Memory Size
Time of Day Alarms Integrated Resonator Functions Package/Pins Budgetary
See Notes
DS1682  I2C
EEPROM 10 1 RC Osc Elapsed Time Counter
$2.27 @1k
See All Timekeeping & Real-Time Clocks (76)
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.

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