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.
The device is fully accessible through the serial interface while VCC is between 1.8V and 5.5V. I2C operation is not guaranteed below 1.8V. Timekeeping operation is maintained with VCC as low as 1.3V.

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)