DS1337S+ (MAXIM INTEGRATED PRODUCTS)

The DS1337S+ is an I?C serial Real-time Clock with two programmable time-of-day alarms and a programmable square-wave output. Address and data are transferred serially through an I?C 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 1.8 and 5.5V. I?C operation is not guaranteed below 1.8V. Timekeeping operation is maintained with VCC as low as 1.3V.