General Description
The DS1339A serial real-time clock (RTC) is a lowpower clock/date device with two programmable timeof-day alarms and a programmable square-wave output.

Benefits and Features
♦ Drop-In Replacement for DS1339
♦ Real-Time Clock (RTC) Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap-Year Compensation Up to 2200 Two Time-of-Day Alarms Programmable Square-Wave Output
♦ Supports Crystals with Up to 60kΩ ESR
♦ Maintains Time Even During Power Outage with Backup Supply Pin Automatic Power-Fail Detect and Switch Circuitry Trickle-Charge Capability
♦ Supports VCC from 1.8V to 5V Oscillator Stop Flag Oscillator Runs Down to 1.15V
♦ Interfaces with a Wide Range of Microcontrollers I2C Serial Interface
♦ Underwriters Laboratories (UL) Recognized

Applications
    Handhelds (GPS, POS Terminals)
    Consumer Electronics (Set-Top Box, Digital Recording, Network Appliance)
    Office Equipment (Fax/Printers, Copier)
    Medical (Glucometer, Medicine Dispenser)
    Telecommunications (Routers, Switches, Servers)
    Other (Utility Meter, Vending Machine, Thermostat, Modem)