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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

C, 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

C 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

SCL

SDA

BAT

GND

SQW/OUT

SCL

SDA

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

SDA

SCL

GND

X2 X1

CRYSTAL

SQW/OUT

BAT

= t

DS1307

64 x 8, Serial, I

C Real-Time Clock

DS1307 64 x 8, Serial, I

C Real-Time Clock

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ABSOLUTE MAXIMUM RATINGS

Voltage Range on Any Pin Relative to Ground ....................................................................................-0.5V to +7.0V

Operating Temperature Range (Noncondensing)

Commercial................................................................................................................................0°C to +70°C

Industrial ..................................................................................................................................-40°C to +85°C

Storage Temperature Range ............................................................................................................. -55°C to +125°C

Soldering Temperature (DIP, leads)........................................................................................+260°C for 10 seconds

Soldering Temperature (surface mount)…..……………………….Refer to the JPC/JEDEC J-STD-020 Specification.

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only,

and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is

not implied. Exposure to the absolute maximum rating conditions for extended periods may affect device reliability.

RECOMMENDED DC OPERATING CONDITIONS

= 0°C to +70°C, T

= -40°C to +85°C.) (Notes 1, 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Voltage V

4.5 5.0 5.5 V

Logic 1 Input V

2.2 V

+ 0.3 V

Logic 0 Input V

-0.3 +0.8 V

BAT

Battery Voltage V

BAT

2.0 3 3.5 V

DC ELECTRICAL CHARACTERISTICS

= 4.5V to 5.5V; T

= 0°C to +70°C, T

= -40°C to +85°C.) (Notes 1, 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Input Leakage (SCL) I

-1 1

μA

I/O Leakage (SDA, SQW/OUT) I

-1 1

μA

Logic 0 Output (I

= 5mA) V

0.4 V

Active Supply Current

SCL

= 100kHz)

CCA

1.5 mA

Standby Current I

CCS

(Note 3) 200

μA

BAT

Leakage Current I

BATLKG

5 50 nA

Power-Fail Voltage (V

BAT

= 3.0V) V

1.216 x

BAT

1.25 x

BAT

1.284 x

BAT

DC ELECTRICAL CHARACTERISTICS

= 0V, V

BAT

= 3.0V; T

= 0°C to +70°C, T

= -40°C to +85°C.) (Notes 1, 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

BAT

Current (OSC ON);

SQW/OUT OFF

BAT1

300 500 nA

BAT

Current (OSC ON);

SQW/OUT ON (32kHz)

BAT2

480 800 nA

BAT

Data-Retention Current

(Oscillator Off)

BATDR

10 100 nA

WARNING: Negative undershoots below -0.3V while the part is in battery-backed mode may cause loss of data.

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