I²C, 32-Bit, Binary Counter Clock with 64-Bit ID

Ideal Clock for Portable Media Players


The DS1372 is a 32-bit binary up counter and 24-bit down counter with a unique 64-bit ID. The counters, ID, configuration, and status registers are accessed using an I²C serial interface. The DS1372 includes a SQW/active-low INT open-drain output that can output either a square wave at one of four predefined frequencies, or it can output an active-low signal when the 24-bit down counter reaches 0.
DS1372: Typical Operating Circuit DS1372: Typical Operating Circuit Enlarge+

Key Features

  • Compliant with Microsoft Windows Media® DRM 10 for Portable Devices
  • 32-Bit Binary Counter
  • Programmable Alarm
  • 64-Bit Factory-Programmed ID
  • Interrupt Output
  • I²C Serial Interface
  • Two Selectable I²C Addresses
  • 2.4V to 5.5V Operating Voltage Range
  • 1.3V to 5.5V Timekeeping Operating Range
  • -40°C to +85°C Operating Temperature Range
  • 8-Pin µSOP


  • Portable Audio and Video Players
Part Number Interface VSUPPLY
Time Keeping Current
Memory Type Time of Day Alarms Budgetary
typ See Notes
DS1372  I2C
400 12.5 None 1 $1.26 @1k
See All Timekeeping & Real-Time Clocks (83)
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.

Technical Documents

Tutorial 5791 Tips for Writing Bulletproof Real-Time Clock Control Code
App Note 58 Crystal Considerations with Maxim Real-Time Clocks (RTCs)

Quality and Environmental Data

Product Reliability Reports: DS1372.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Related Resources