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DS1306: Serial Alarm Real-Time Clock Data Sheet (Rev. 4)4/27/2015PDF371K
Overview
Features and Benefits
- Completely Manages All Timekeeping Functions
- 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
- 96-Byte, Battery-Backed NV RAM for Data Storage
- Two Time-Of-Day Alarms, Programmable on Combination of Seconds, Minutes, Hours, and Day of the Week
- 1Hz and 32.768kHz Clock Outputs
- Standard Serial Port Interfaces with Most Microcontrollers
- Supports Motorola SPI (Serial Peripheral Interface) Modes 1 and 3 or Standard 3-Wire Interface
- Burst Mode for Reading/Writing Successive Addresses in Clock/RAM
- Multiple Power Supply Pins Ease Adding Battery For Backup
- Dual-Power Supply Pins for Primary and Backup Power Supplies
- Optional Trickle Charge Output to Backup Supply
- 2.0V to 5.5V Operation
- Optional Industrial Temperature Range: -40°C to +85°C Supports Operation in a Wide Range of Applications
- 20-Pin TSSOP Minimizes Required Space
- Underwriters Laboratory (UL®) Recognized
Product Details
The DS1306 serial alarm real-time clock (RTC) provides a full binary coded decimal (BCD) clock calendar that is accessed by a simple serial interface. 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. In addition, 96 bytes of NV RAM are provided for data storage.
An interface logic-power supply input pin (VCCIF) allows the DS1306 to drive SDO and 32kHz pins to a level that is compatible with the interface logic. This allows an easy interface to 3V logic in mixed supply systems. The DS1306 offers dual-power supplies as well as a battery-input pin. The dual-power supplies support a programmable trickle charge circuit that allows a rechargeable energy source (such as a super cap or rechargeable battery) to be used for a backup supply. The VBAT pin allows the device to be backed up by a non-rechargeable battery. The DS1306 is fully operational from 2.0V to 5.5V.
Two programmable time-of-day alarms are provided by the DS1306. Each alarm can generate an interrupt on a programmable combination of seconds, minutes, hours, and day. "Don't care" states can be inserted into one or more fields if it is desired for them to be ignored for the alarm condition. A 1Hz and a 32kHz clock output are also available.
The DS1306 supports a direct interface to SPI™ serial data ports or standard 3-wire interface. An easy-to use address and data format is implemented in which data transfers can occur 1-byte at a time or in multiple-byte Burst Mode®.
Product Categories
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
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DS1306 Reliability Data1/12/2023PDF19K
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Oscillator Design Considerations for Low-Current Applications1/26/2011
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Selecting a Backup Source for Real-Time Clocks5/26/2006
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Interfacing a DS1305 RTC with an \r\n8051-Type Microcontroller5/24/2005
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Estimating Super Capacitor Backup Time on Trickle-Charger Real-Time Clocks5/24/2005
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Interfacing an SPI RTC with a Motorola DSP11/21/2003
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Using the DS32kHz with Maxim Real-Time Clocks2/15/2002
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Design Considerations for Maxim Real-Time Clocks2/15/2002
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Interfacing SPI Real-Time Clocks (RTCs) with a Microcontroller5/22/2001
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Crystal Considerations with Maxim Real-Time Clocks (RTCs)3/29/2001
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Tips for Writing Bulletproof Real-Time Clock Control Code3/28/2014
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State Machine Logic in Binary-Coded Decimal (BCD)-Formatted Real-Time Clocks9/17/2012
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Interfacing an SPI-Interface RTC with a PIC Microcontroller8/25/2003
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Using the Dallas Tricklecharge Timekeeper6/7/2002
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Lithium Coin-Cell Batteries: Predicting an Application Lifetime3/27/2002
Design Resources
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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