Key Features

• Compatible with Crystal ESR Up to 100kΩ Allows a Crystal to be Optimized for Cost and Space
• Low-Power Operation Extends Battery Backup Run Time
  • Low Timekeeping Current of 250nA (typ)
  • Automatic Power-Fail Detect and Switch Circuitry
• Completely Manages All Timekeeping Functions
  • Real-Time Clock Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year with Leap-Year Compensation Valid Up to 2400
  • External Clock Source for Synchronization Clock Reference (e.g., 32kHz, 50Hz/60Hz Powerline, GPS 1PPS)
  • 56-Byte, Battery-Backed, General-Purpose RAM with Unlimited Writes
  • Programmable Square-Wave Output Signal
• Simple Serial Port Interfaces with Most Microcontrollers
  • I2C Serial Interface
• Industrial Temperature Range: -40°C to +85°C Supports Operation in a Wide Range of Applications
• Underwriters Laboratories (UL®) Recognized

DS1308: Typical Operating Circuit

Applications/Uses

• Consumer Electronics (Set-Top Box, Digital Recording, Network Appliance)
• Handhelds (GPS, POS Terminal)
• Medical (Glucometer, Medicine Dispenser)
• Office Equipment (Fax/Printer, Copier)
• Other (Utility Meter, Vending Machine, Thermostat, Modem)
• Telecommunications (Router, Switcher, Server)