GENERAL DESCRIPTION

The DS1307 serial real-time clock (RTC) is a lowpower,

full binary-coded decimal (BCD) clock/calendar

plus 56 bytes of NV SRAM. Address and data are

transferred serially through an I2C, bidirectional bus.

The clock/calendar provides seconds, minutes, hours,

day, date, month, and year information. The end of

the month date 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 DS1307 has a

built-in power-sense circuit that detects power failures

and automatically switches to the backup supply.

Timekeeping operation continues while the part

operates from the backup supply.

FEATURES

Real-Time Clock (RTC) Counts Seconds,

Minutes, Hours, Date of the Month, Month, Day of

the week, and Year with Leap-Year

Compensation Valid Up to 2100

56-Byte, Battery-Backed, General-Purpose RAM

with Unlimited Writes

I2C Serial Interface

Programmable Square-Wave Output Signal

Automatic Power-Fail Detect and Switch Circuitry

Consumes Less than 500nA in Battery-Backup

Mode with Oscillator Running

Optional Industrial Temperature Range:

-40°C to +85°C

Available in 8-Pin Plastic DIP or SO

Underwriters Laboratories (UL) Recognized