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081800

FEATURES

Real time clock 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 nonvolatile RAM for data storage

2-wire serial interface

Programmable squarewave output signal

Automatic power-fail detect and switch

circuitry

Consumes less than 500 nA in battery backup

mode with oscillator running

Optional industrial temperature range

-40°C to +85°C

Available in 8-pin DIP or SOIC

Recognized by Underwriters Laboratory

ORDERING INFORMATION

DS1307

8-Pin DIP

DS1307Z

8-Pin SOIC (150 mil)

DS1307N

8-Pin DIP (Industrial)

DS1307ZN

8-Pin SOIC (Industrial)

PIN ASSIGNMENT

PIN DESCRIPTION

- Primary Power Supply

X1, X2

- 32.768 kHz Crystal Connection

- +3V Battery Input

GND

- Ground

SDA

- Serial Data

SCL

- Serial Clock

SQW/OUT

- Square wave/Output Driver

DESCRIPTION

The DS1307 Serial Real Time Clock is a low power, full BCD clock/calendar plus 56 bytes of

nonvolatile SRAM.

Address and data are transferred serially via a 2-wire bi-directional 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 less 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 which detects power failures and automatically switches to the battery

supply.

DS1307

64 X 8 Serial Real Time Clock

www.dalsemi.com

DS1307Z 8-Pin SOIC (150 mil)

DS1307 8-Pin DIP (300 mil)

X1

X2

GND

SQW/OUT

SCL

l

2

3

4

8

7

6

5

SDA

l

2

3

4

8

7

6

5

X1

X2

GND

SQW/OUT

SCL

SDA