ENGLISH • 简体中文 • 日本語 • 한국어  

    Login | Register 


   
 
Enter keywords or part number    


What's New Products Solutions Design AppNotes Support Sales About Us Members

Maxim > Products > [Real-Time Clocks] 
DS1306
Serial Alarm Real-Time Clock


  QuickView     Technical Documents     Ordering Info     More Information     User Comments (0)     All  
Status
Part Number Status
DS1306 Active: In Production. But some versions of the family are No Longer Available. See Ordering Information.

Data Sheet
FULL DATA SHEET (PDF, 388kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
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®.

Key Features
  • 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
  • 96-byte nonvolatile 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
  • Serial interface supports Motorola serial peripheral interface (SPI) serial data ports or standard 3-wire interface
  • Burst mode for reading/writing successive addresses in clock/RAM
  • 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
  • Available in space-efficient 20-pin TSSOP package
  • Underwriters Laboratories (UL®) Recognized

Key Specifications:  Timekeeping & Real-Time Clocks
Part Number Date/ Time Format Interface VSUPPLY
(V)		 Time Keeping Current
(nA)		 CL
(pF)		 Memory Type Memory Size
(Bytes)		 Time of Day Alarms Price
hh = sec/100 typ See Notes
DS1306  YY-MM-DD/ HH:MM:SS
3-Wire
SPI
2
3
3.3
5
 450 6 NV SRAM 96 2 $1.84 @1k
See All Timekeeping & Real-Time Clocks (80)

Diagram
DS1306: Typical Operating Circuit
Typical Operating Circuit

Application Notes
  		• Application Note 58: Crystal Considerations with Dallas Real-Time Clocks (RTCs) - DS1306
  		• Application Note 502: Interfacing SPI Real-Time Clocks (RTCs) with a Microcontroller - DS1306
  		• Application Note 504: Design Considerations for Dallas Semiconductor Real-Time Clocks - DS1306
  		• Application Note 505: Lithium Coin-Cell Batteries: Predicting an Application Lifetime - DS1306
  		• Application Note 701: Using the DS32kHz with Dallas Real-Time Clocks - DS1306
  		• Application Note 2361: Interfacing an SPI-Interface RTC with a PIC Microcontroller - DS1306
  		• Application Note 2833: Interfacing an SPI RTC with a Motorola DSP - DS1306
  		• Application Note 3510: Interfacing a DS1305 RTC with an 8051-Type Microcontroller - DS1306
  		• Application Note 3816: Selecting a Backup Source for Real-Time Clocks - DS1306

    Design Guides
  		• Real-Time Clocks (PDF)

    Reliability Reports
  		• Reliability Report: DS1306.pdf
  		• Underwriters Laboratories (UL®) Recognized

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-13 of 13

    DS1306 Free
    Sample    		 Buy Status Recommended Replacement
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1306    
    		Active
    		PDIP(N);16 pin;158 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P16-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1306+  
    		Active
    		PDIP(N);16 pin;158 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P16+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1306N    
    		Active
    		PDIP(N);16 pin;158 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P16-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1306N+    
    		Active
    		PDIP(N);16 pin;158 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1306E/T&R     N/A No Longer Available DS1306E+
    		 TSSOP;20 pin;45 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0116 (PDF)
    Use pkgcode/variation: U20-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1306EN     N/A No Longer Available DS1306EN+
    		 TSSOP;20 pin;45 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0116 (PDF)
    Use pkgcode/variation: U20-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1306EN/T&R     N/A No Longer Available DS1306EN+
    		 TSSOP;20 pin;45 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0116 (PDF)
    Use pkgcode/variation: U20-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1306EN/T&R/C04     N/A No Longer Available DS1306EN+

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    DS1306E    
    		Active
    		TSSOP;20 pin;45 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0116 (PDF)
    Use pkgcode/variation: U20-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1306E+  
    		Active
    		TSSOP;20 pin;45 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0116 (PDF)
    Use pkgcode/variation: U20+3*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1306E+T&R    
    		Active
    		TSSOP;20 pin;45 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0116 (PDF)
    Use pkgcode/variation: U20+3*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1306EN+    
    		Active
    		TSSOP;20 pin;45 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0116 (PDF)
    Use pkgcode/variation: U20+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1306EN+T&R    
    		Active
    		TSSOP;20 pin;45 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0116 (PDF)
    Use pkgcode/variation: U20+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• RTC Calculator
  		• Super Capacitor Calculator

    Related Products
    DS1302 Trickle-Charge Timekeeping Chip
    DS1305 Serial Alarm Real-Time Clock
    MAX6902 SPI-Compatible RTC in a TDFN
    MAX6901 3-Wire Serial RTC in a TDFN
    DS1390, DS1391, DS1392, DS1393, DS1394 Low-Voltage SPI/3-Wire RTCs with Trickle Charger

    More Like This: View Product Families for Similar Products

    Didn't Find What You Need?
  • Next Day Product Selection Assistance from Applications Engineers
  • Parametric Search
  • Applications Help

    •  QuickView   Technical Documents   Ordering Info   More Information  
     Description 
     Key Features 
     Applications/Uses 
     Key Specifications 
     Diagram 

    		 Data Sheet 
     Application Notes 
     Design Guides 
     Engineering Journals 
     Reliability Reports 
     Software/Models 
     Evaluation Kits 

    		 Price and Availability 
     Samples 
     Buy Online 
     Package Information 
     Lead-Free Information 

    		 Related Products 
     Notes and Comments 
     Evaluation Kits 

    2005-07-18
    This page last modified: 2009-05-04


            •         •         •     Privacy Policy     •     Legal Notices

        Copyright © 2009 by Maxim Integrated Products