GENERAL DESCRIPTION
The DS1337 serial real-time clock is a low-power clock/calendar 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/calendar 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.

FEATURES
■ Real-Time Clock (RTC) Counts Seconds,
   Minutes, Hours, Day, Date, Month, and Year
   with Leap-Year Compensation Valid Up to
   2100
■ Available in a Surface-Mount Package with an
   Integrated Crystal (DS1337C)
■ I2C Serial Interface
■ Two Time-of-Day Alarms
■ Oscillator Stop Flag
■ Programmable Square-Wave Output
   Defaults to 32kHz on Power-Up
■ Available in 8-Pin DIP, SO, or µSOP
■ -40°C to +85°C Operating Temperature Range

APPLICATIONS
   Handhelds (GPS, POS Terminal, MP3 Player)
   Consumer Electronics (Set-Top Box, VCR/Digital Recording)
   Office Equipment (Fax/Printer, Copier)
   Medical (Glucometer, Medicine Dispenser)
   Telecommunications (Router, Switch, Server)
   Other (Utility Meter, Vending Machine, Thermostat, Modem)