1339

Real-Time Clock with Serial I2C Interface DATASHEET 1339 Description The 1339 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 1339 has a built-in power-sense circuit that detects power failures and automatically switches to the backup supply, maintaining time, date, and alarm operation. Applications Handhelds (GPS, POS terminals) Consumer Electronics (Set-Top Box, Digital Recording, Network Applications) Office (Fax/Printers, Copiers) Medical (Glucometer, Medicine Dispensers) Telecomm (Routers, Switches, Servers) Other (Thermostats, Vending Machines, Modems, Utility Meters) Features Real-Time Clock (RTC) counts seconds, minutes, hours, day, date, month, and year with leap-year compensation valid up to 2100 Packaged in 8-TSSOP, 8-SOIC, or 16-SOIC (surface-mount package with an integrated crystal) Fast mode I2C Serial interface Two time-of-day alarms Programmable square-wave output Oscillator stop flag Automatic power-fail detect and switch circuitry Trickle-charge capability Industrial tempe...