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 via a 2-wire, bidirectional 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

■ Two-Wire 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

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, Switcher, Server)

Other (Utility Meter, Vending Machine, Thermostat,

Modem)