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Maxim > Products > [Supervisors, Voltage Monitors, Sequencers]  [Real-Time Clocks] 
DS1374, DS1374C, DS1374U
I²C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output

Elapsed Time Counter Provides Power-On Reset, Watchdog or Alarm, and Square Wave


  QuickView     Technical Documents     Ordering Info     More Information     User Comments (0)     All  
Status
Part Number Status
DS1374 Active: In Production.
DS1374C Active: In Production. But some versions of the family are No Longer Available. See Ordering Information.
DS1374U Active: In Production. But some versions of the family are No Longer Available. See Ordering Information.

Data Sheet
FULL DATA SHEET (PDF, 200kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The DS1374 is a 32-bit binary counter designed to continuously count time in seconds. An additional counter generates a periodic alarm or serves as a watchdog timer. If disabled, this counter can be used as 3 bytes of nonvolatile (NV) RAM. Separate output pins are provided for an interrupt and a square wave at one of four selectable frequencies. A precision temperature-compensated reference and comparator circuit monitor the status of VCC to detect power failures, provide a reset output, and automatically switch to the backup supply when necessary.

Additionally, the reset pin is monitored as a pushbutton input for externally generating a reset. The device is programmed serially through an I²C serial interface.

Key Features   Applications/Uses
  • 32-Bit Binary Counter
  • Second Binary Counter Provides Time-of-Day Alarm, Watchdog Timer, or NV RAM
  • Separate Square-Wave and Interrupt Output Pins
  • I²C Serial Interface
  • Automatic Power-Fail Detect and Switch Circuitry
  • Single-Pin Pushbutton Reset Input/Open-Drain Reset Output
  • Low-Voltage Operation
  • Trickle-Charge Capability
  • -40°C to +85°C Operating Temperature Range
  • 10-Pin µSOP, 16-Pin SO
  • Available in a Surface-Mount Package with an Integrated Crystal (DS1374C)
  • Underwriters Laboratories (UL®) Recognized

  
  		• Medical Equipment
  		• Point-of-Sale Equipment
  		• Portable Instrumentation
  		• Telecommunications

    Key Specifications:  Timekeeping & Real-Time Clocks
    Part Number Functions Date/ Time Format Interface VSUPPLY
    (V)    		 Time Keeping Current
    (nA)    		 CL
    (pF)    		 Memory Type Time of Day Alarms Price
    hh = sec/100 typ See Notes
    DS1374 
    Elapsed Time Counter
    Watchdog Timekeeper
    		 Binary I2C
    1.8
    3
    3.3
    5
    		 400 6 None 1 $1.25 @1k
    See All Timekeeping & Real-Time Clocks (80)

    Diagram
    DS1374, DS1374C, DS1374U: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  		• Application Note 58: Crystal Considerations with Dallas Real-Time Clocks (RTCs) - DS1374
  		• Application Note 504: Design Considerations for Dallas Semiconductor Real-Time Clocks - DS1374
  		• Application Note 505: Lithium Coin-Cell Batteries: Predicting an Application Lifetime - DS1374
  		• Application Note 511: Using the DS1672 Low-Voltage Serial Timekeeping IC - DS1374
  		• Application Note 512: Using the Watchdog/Alarm Counter in the DS1371 and DS1374 Real-Time Clocks - DS1374
  		• Application Note 517: DS1371/DS1372/DS1374 32-Bit Binary Counter Time Conversion - DS1374
  		• Application Note 701: Using the DS32kHz with Dallas Real-Time Clocks - DS1374
  		• Application Note 3572: FAQ About the Integrated-Crystal Package Option - DS1374
  		• Application Note 3816: Selecting a Backup Source for Real-Time Clocks - DS1374

    Design Guides
  		• Real-Time Clocks (PDF)

    Reliability Reports
  		• Reliability Report: DS1374.pdf
  		• Request Reliability Report for:
  		• 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: 1-18 of 18

    DS1374C Free
    Sample    		 Buy Status Recommended Replacement
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1374C-3#T&R    
    		Active
    		SOIC(W);16 pin;111 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0107 (PDF)
    Use pkgcode/variation: W16#H2*
    		-40°C to +85°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    DS1374C-33     N/A No Longer Available DS1374C-33#
    		 SOIC(W);16 pin;111 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0107 (PDF)
    Use pkgcode/variation: W16-H2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1374C-18    
    		Active
    		SOIC(W);16 pin;111 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0107 (PDF)
    Use pkgcode/variation: W16-H2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1374C-3    
    		Active
    		SOIC(W);16 pin;111 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0107 (PDF)
    Use pkgcode/variation: W16-H2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1374C-33/T&R    
    		Active
    		SOIC(W);16 pin;111 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0107 (PDF)
    Use pkgcode/variation: W16-H2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1374C-18#  
    		Active
    		SOIC(W);16 pin;111 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0107 (PDF)
    Use pkgcode/variation: W16#H2*
    		-40°C to +85°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    DS1374C-3#  
    		Active
    		SOIC(W);16 pin;111 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0107 (PDF)
    Use pkgcode/variation: W16#H2*
    		-40°C to +85°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    DS1374C-33#  
    		Active
    		SOIC(W);16 pin;111 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0107 (PDF)
    Use pkgcode/variation: W16#H2*
    		-40°C to +85°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    DS1374C-33#T&R    
    		Active
    		SOIC(W);16 pin;111 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0107 (PDF)
    Use pkgcode/variation: W16#H2*
    		-40°C to +85°C RoHS/Lead-Free: RoHS Qualified
    Materials Analysis
    DS1374U Free
    Sample    		 Buy Status Recommended Replacement
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1374U-3     N/A No Longer Available DS1374U-3+
    		 µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1374U-33/T&R     N/A No Longer Available DS1374U-33+
    		 µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1374U-18    
    		Active
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1374U-33    
    		Active
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1374U-18+  
    		Active
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1374U-3+  
    		Active
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1374U-3+T&R    
    		Active
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1374U-33+  
    		Active
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1374U-33+T&R    
    		Active
    		µMAX;10 pin;15 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• New Product Press Release 2003-03-28 
  		• RTC Calculator
  		• Super Capacitor Calculator

    Related Products
    DS1672 I²C 32-Bit Binary Counter RTC
    DS1371 I²C, 32-Bit Binary Counter Watchdog Clock

    More Like This: View Product Families for Similar Products

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     Description 
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    2006-01-24
    This page last modified: 2009-05-15


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