Features and Benefits
- 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
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.
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
DS1307 Reliability Data1/12/2023
Oscillator Design Considerations for Low-Current Applications1/26/2011
Using a DS1307 with a PIC Microcontroller9/29/2006
Selecting a Backup Source for Real-Time Clocks5/26/2006
Using the DS32kHz with Maxim Real-Time Clocks2/15/2002
Design Considerations for Maxim Real-Time Clocks2/15/2002
Crystal Considerations with Maxim Real-Time Clocks (RTCs)3/29/2001
The What, Why, When, Where and How of Real-Time Clocks (RTCs)1/22/2019
Tips for Writing Bulletproof Real-Time Clock Control Code3/28/2014
State Machine Logic in Binary-Coded Decimal (BCD)-Formatted Real-Time Clocks9/17/2012
Lithium Coin-Cell Batteries: Predicting an Application Lifetime3/27/2002
Interfacing the DS1307 with an 8051-Compatible Microcontroller3/29/2001
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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