General Description
The DS3234 is a low-cost, extremely accurate SPI bus real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. The DS3234 incorporates a precision, temperature-compensated voltage reference and comparator circuit to monitor VCC.

Benefits and Features
• Highly Accurate RTC with Integrated Crystal and
   SRAM Completely Manages All Timekeeping
   Functions
   • Accuracy ±2ppm from 0°C to +40°C
   • Accuracy ±3.5ppm from -40°C to +85°C
   • Real-Time Clock Counts Seconds, Minutes, Hours,
      Day, Date, Month, and Year, with Leap Year
      Compensation Valid Up to 2099
   • Digital Temp Sensor Output: ±3°C Accuracy
   • Register for Aging Trim
   • RST Input/Output
   • Two Time-of-Day Alarms
   • Programmable Square-Wave Output
• Simple Serial Interface Connects to Most
   Microcontrollers
   • 4MHz SPI Bus Supports Modes 1 and 3
• Battery-Backup Input for Continuous Timekeeping
   • Low Power Operation Extends Battery Backup Run
      Time
• Operating Temperature Ranges: Commercial: 0°C to
   +70°C, Industrial: -40°C to +85°C
• 300-Mil, 20-Pin SO Package
• Underwriters Laboratories® (UL) Recognized

Applications
   Servers
   Utility Power Meters
   Telematics
   GPS