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
DS1339A Applications
Consumer Electronics (Set-Top Box, Digital Recording, Network Appliance)
Handhelds (GPS, POS Terminals)
Medical (Glucometer, Medicine Dispenser)
Office Equipment (Fax/Printers, Copier)
Other (Utility Meter, Vending Machine, Thermostat, Modem)
Telecommunications (Routers, Switches, Servers)
DS1339A Description
The DS1339A serial real-time clock (RTC) is a low-power clock/date device with two programmable time-of-day alarms and a programmable square-wave output. Address and data are transferred serially through an I²C bus. The clock/date provides seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. The DS1339A has a builtin power-sense circuit that detects power failures and automatically switches to the backup supply, maintaining time, date, and alarm operation.
