DS1337U+T&R

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.

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)

Key features

• Completely Manages All Timekeeping Functions
• Real-Time Clock (RTC) Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap-Year Compensation Valid Up to 2100
• Two Time-of-Day Alarms
• Programmable Square-Wave Output Defaults to 32kHz on Power-Up
• Oscillator Stop Flag
• Interfaces with Most Microcontrollers
• I2C Serial Interface
• Surface-Mount Package with an Integrated Crystal (DC1337C) Saves Additional Space and Simplifies Design
• -40°C to +85°C Industrial Temperature Range
• Supports Operation in a Wide Range of Applications