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DS1307N Real-Time Clock: Circuit, Pinout, and Datasheet

IC RTC CLK/CALENDAR I2C 8-DIP The DS1307N serial real-time clock (RTC) is a low-power clock/calendar with complete binary-coded decimal (BCD) and 56 bytes of NV SRAM. This article mainly introduces circuit, pinout, datasheet and other detailed information about Maxim Integrated DS1307N.

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Feb 2, 2022

Wanda Susan

How to use DS1307 Real Time Clock with Arduino code

 

IC RTC CLK/CALENDAR I2C 8-DIP

The DS1307N serial real-time clock (RTC) is a low-power clock/calendar with complete binary-coded decimal (BCD) and 56 bytes of NV SRAM. This article mainly introduces circuit, pinout, datasheet and other detailed information about Maxim Integrated DS1307N.

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DS1307N Description

The DS1307N serial real-time clock (RTC) is a low-power clock/calendar with complete binary-coded decimal (BCD) and 56 bytes of NV SRAM. An  I2C  bidirectional bus is used to transport address and data serially.

The clock/calendar displays information such as seconds, minutes, hours, days, dates, months, and years. For months with fewer than 31 days, the end of the month date is automatically modified, including leap year corrections. The clock has an AM/PM indicator and works in either a 24-hour or 12-hour mode. The DS1307N includes a built-in power sensor circuit that detects power outages and switches to the backup source automatically. While the part is running on the backup supply, the timekeeping operation continues.

DS1307N Pinout

The following figure is DS1307N Pinout.

Pinout

 

DS1307N CAD Model

The following figures are DS1307N Symbol, Footprint and 3D Model.

Symbol

Footprint

3D Model

DS1307N Features

• Completely Manages All Timekeeping Functions

o 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

o 56-Byte, Battery-Backed, General-Purpose RAM with Unlimited Writes

o Programmable Square-Wave Output Signal

• Simple  Serial Port  Interfaces to Most Microcontrollers

o I2C Serial Interface

• Low Power Operation Extends Battery Backup Run Time

o Consumes Less than 500nA in Battery Backup Mode with Oscillator Running

o Automatic Power-Fail Detect and Switch Circuitry

• 8-Pin DIP and 8-Pin SO Minimizes Required Space

• Optional Industrial Temperature Range: -40°C to +85°C Supports Operation in a Wide Range of Applications

• Underwriters Laboratories ® (UL) Recognized

Specifications

Maxim Integrated DS1307N technical specifications, attributes, parameters and parts with similar specifications to Maxim Integrated DS1307N.

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DS1307N Functional Block Diagram

The following figure is DS1307N Functional Block Diagram.

Functional Block Diagram

DS1307N Typical Operating Circuit

The following shows DS1307N Typical Operating Circuit.

Typical Operating Circuit

DS1307N Alternatives

Part Number Description Manufacturer
DS1307NMICROCONTROLLERS AND PROCESSORS Real Time Clock, Volatile, 1 Timer(s), CMOS, PDIP8, DIP-8 Dallas Semiconductor
DS1307INDUCTORS General Purpose Inductor, Falco Electronics
DS1307+MICROCONTROLLERS AND PROCESSORS Real Time Clock, Volatile, 1 Timer(s), CMOS, PDIP8, 0.300 INCH, ROHS COMPLIANT, PLASTIC, DIP-8 Maxim Integrated Products

DS1307N Applications

• Backup Supply

• AM/PM Indicator

DS1307N Package

The following figure is DS1307N Package.

Package

Datasheet PDF

Download datasheets and manufacturer documentation for Maxim Integrated DS1307N.

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Frequently Asked Questions

What is the difference between DS1307 and DS3231?
The main difference between the DS3231 and DS1370 is the accuracy of time-keeping. DS1307 comes with an external 32kHz crystal for time-keeping whose oscillation frequency is easily affected by external temperature. This usually results in the clock being off by around five or so minutes per month.
What is the purpose of DS1307 pin 3?
Battery input for any standard 3V lithium cell or other energy sources. Battery voltage should be between 2V and 3.5V for suitable operation. The nominal write-protect trip point voltage at which access to the RTC and user RAM is denied is set by the internal circuitry as 1.25 x VBAT nominal.
Is DS3231 compatible with DS1307?
Although the notes and functions in the sketch refer only to the DS3231, the code also works with the DS1307. There may be a lot of code, however, it breaks down well into manageable parts.
How many bytes of NV SRAM is the DS1307N serial real-time clock?
56 bytes.
What is used to transport address and data serially?
An I2C bidirectional bus.
In what mode does the DS1307N clock work?
24-hour or 12-hour.
What does the DS1307N include?
A built-in power sensor circuit.
What happens when the part is running on the backup supply?
The timekeeping operation continues.
FAQ
What is the difference between DS1307 and DS3231?
The main difference between the DS3231 and DS1370 is the accuracy of time-keeping. DS1307 comes with an external 32kHz crystal for time-keeping whose oscillation frequency is easily affected by external temperature. This usually results in the clock being off by around five or so minutes per month.
What is the purpose of DS1307 pin 3?
Battery input for any standard 3V lithium cell or other energy sources. Battery voltage should be between 2V and 3.5V for suitable operation. The nominal write-protect trip point voltage at which access to the RTC and user RAM is denied is set by the internal circuitry as 1.25 x VBAT nominal.
Is DS3231 compatible with DS1307?
Although the notes and functions in the sketch refer only to the DS3231, the code also works with the DS1307. There may be a lot of code, however, it breaks down well into manageable parts.
How many bytes of NV SRAM is the DS1307N serial real-time clock?
56 bytes.
What is used to transport address and data serially?
An I2C bidirectional bus.
In what mode does the DS1307N clock work?
24-hour or 12-hour.
What does the DS1307N include?
A built-in power sensor circuit.
What happens when the part is running on the backup supply?
The timekeeping operation continues.

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