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REV: 100208

GENERAL DESCRIPTION

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

power, full binary-coded decimal (BCD) clock/calendar

plus 56 bytes of NV SRAM. Address and data are

transferred serially through an I

2C, 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.

TYPICAL OPERATING CIRCUIT

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

I

2C 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

PIN CONFIGURATIONS

V

CC

SCL

SDA

X1

X2

V

BAT

GND

SQW/OUT

V

CC

SCL

SDA

X1

X2

V

BAT

GND

SQW/OUT

PDIP (300 mils)

SO (150 mils)

TOP VIEW

ORDERING INFORMATION

PART

TEMP RANGE

VOLTAGE (V) PIN-PACKAGE

TOP MARK*

DS1307+

0°C to +70°C

5.0

8 PDIP (300 mils)

DS1307

DS1307N+

-40°C to +85°C

5.0

8 PDIP (300 mils)

DS1307N

DS1307Z+

0°C to +70°C

5.0

8 SO (150 mils)

DS1307

DS1307ZN+

-40°C to +85°C

5.0

8 SO (150 mils)

DS1307N

DS1307Z+T&R

0°C to +70°C

5.0

8 SO (150 mils) Tape and Reel

DS1307

DS1307ZN+T&R

-40°C to +85°C

5.0

8 SO (150 mils) Tape and Reel

DS1307N

+Denotes a lead-free/RoHS-compliant package.

*A “+” anywhere on the top mark indicates a lead-free package. An “N” anywhere on the top mark indicates an industrial temperature range

device.

DS130

CPU

VCC

VCC

VCC

SDA

SCL

GND

X2

X1

VCC

RPU

RPU

CRYSTAL

SQW/OUT

VBAT

RPU = tr/Cb

DS1307

64 x 8, Serial, I2C Real-Time Clock