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DS1307
Analog Real-Time Clock IC - RTC DS1307
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DS1307

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64 x 8, Serial, I²C Real-Time Clock

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Product Details

See parametric specs for Timekeeping & Real-Time Clocks

Key Features

See parametric specs for Timekeeping & Real-Time Clocks
Parametric specs for Timekeeping & Real-Time Clocks
Interface I2C
VSUPPLY (V) 5
Date/ Time Format (hh = sec/100) YY-MM-DD/ HH:MM:SS
Time Keeping Current (nA) (typ) 300
CL (pF) 12.5
Memory Type NV SRAM
Memory Size (Bytes) 56
Time of Day Alarms 0
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes) 		1.61
See parametric specs for Timekeeping & Real-Time Clocks
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Simplified Block Diagram

Technical Docs

Data Sheet 64 x 8, Serial, I²C Real-Time Clock Mar 23, 2015
App Note Using the DS32kHz with Maxim Real-Time Clocks
App Note Oscillator Design Considerations for Low-Current Applications
App Note Lithium Coin-Cell Batteries: Predicting an Application Lifetime
App Note Design Considerations for Maxim Real-Time Clocks
App Note Crystal Considerations with Maxim Real-Time Clocks (RTCs)
App Note Using a DS1307 with a PIC Microcontroller
App Note Selecting a Backup Source for Real-Time Clocks
App Note Interfacing the DS1307 with an 8051-Compatible Microcontroller
Tutorial The What, Why, When, Where and How of Real-Time Clocks (RTCs)
Tutorial State Machine Logic in Binary-Coded Decimal (BCD)-Formatted Real-Time Clocks
Tutorial Tips for Writing Bulletproof Real-Time Clock Control Code

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Parameters

Parametric specs for Timekeeping & Real-Time Clocks
Interface I2C
VSUPPLY (V) 5
Date/ Time Format (hh = sec/100) YY-MM-DD/ HH:MM:SS
Time Keeping Current (nA) (typ) 300
CL (pF) 12.5
Memory Type NV SRAM
Memory Size (Bytes) 56
Time of Day Alarms 0
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes) 		1.61
See parametric specs for Timekeeping & Real-Time Clocks

Key Features

  • Completely Manages All Timekeeping Functions
    • 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, Battery-Backed, General-Purpose RAM with Unlimited Writes
    • Programmable Square-Wave Output Signal
  • Simple Serial Port Interfaces to Most Microcontrollers
    • I2C Serial Interface
  • Low Power Operation Extends Battery Backup Run Time
    • Consumes Less than 500nA in Battery-Backup Mode with Oscillator Running
    • 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

Applications/Uses

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 I²C, 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.

Mobile App

Simplified Block Diagram

DS1307: Typical Operating Circuit DS1307: Typical Operating Circuit Zoom icon

Technical Docs

Data Sheet 64 x 8, Serial, I²C Real-Time Clock Mar 23, 2015
App Note Using the DS32kHz with Maxim Real-Time Clocks
App Note Oscillator Design Considerations for Low-Current Applications
App Note Lithium Coin-Cell Batteries: Predicting an Application Lifetime
App Note Design Considerations for Maxim Real-Time Clocks
App Note Crystal Considerations with Maxim Real-Time Clocks (RTCs)
App Note Using a DS1307 with a PIC Microcontroller
App Note Selecting a Backup Source for Real-Time Clocks
App Note Interfacing the DS1307 with an 8051-Compatible Microcontroller
Tutorial The What, Why, When, Where and How of Real-Time Clocks (RTCs)
Tutorial State Machine Logic in Binary-Coded Decimal (BCD)-Formatted Real-Time Clocks
Tutorial Tips for Writing Bulletproof Real-Time Clock Control Code

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .