1 of 15

REV: 121906

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device

may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.

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

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, Nonvolatile (NV)

RAM for Data Storage

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 Laboratory (UL) Recognized

Typical Operating Circuit and Pin Configurations appear

at end of data sheet.

ORDERING INFORMATION

PART

TEMP RANGE

VOLTAGE

(V)

PIN-PACKAGE

TOP MARK*

DS1307

0°C to +70°C

5.0

8 PDIP (300 mils)

DS1307

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

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

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

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

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

DS1307ZN+T&R

-40°C to +85°C

5.0

8 SO (150 mils) Tape and Reel

DS1307N

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

* A “+” anywhere on the top mark indicates a lead-free device.

DS1307