I²C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output

Elapsed Time Counter Provides Power-On Reset, Watchdog or Alarm, and Square Wave

Please check latest availability status for a specific part variant.


The DS1374 is a 32-bit binary counter designed to continuously count time in seconds. An additional counter generates a periodic alarm or serves as a watchdog timer. If disabled, this counter can be used as 3 bytes of nonvolatile (NV) RAM. Separate output pins are provided for an interrupt and a square wave at one of four selectable frequencies. A precision temperature-compensated reference and comparator circuit monitor the status of VCC to detect power failures, provide a reset output, and automatically switch to the backup supply when necessary.

Additionally, the reset pin is monitored as a pushbutton input for externally generating a reset. The device is programmed serially through an I²C serial interface.
DS1374, DS1374C, DS1374U: Typical Operating Circuit DS1374, DS1374C, DS1374U: Typical Operating Circuit Enlarge+

Key Features

  • 32-Bit Binary Counter
  • Second Binary Counter Provides Time-of-Day Alarm, Watchdog Timer, or NV RAM
  • Separate Square-Wave and Interrupt Output Pins
  • I²C Serial Interface
  • Automatic Power-Fail Detect and Switch Circuitry
  • Single-Pin Pushbutton Reset Input/Open-Drain Reset Output
  • Low-Voltage Operation
  • Trickle-Charge Capability
  • -40°C to +85°C Operating Temperature Range
  • 10-Pin µSOP, 16-Pin SO
  • Available in a Surface-Mount Package with an Integrated Crystal (DS1374C)


  • Medical Equipment
  • Point-of-Sale Equipment
  • Portable Instrumentation
  • Telecommunications

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.
Request Reliability Report for: DS1374C 
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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