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Maxim > Products > [Real-Time Clocks] 
DS1673
Portable System Controller


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 224kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The DS1673 portable system controller is a circuit that incorporates many of the functions necessary for low-power portable products integrated into one chip. The device provides a real-time clock (RTC), NV RAM controller, microprocessor monitor, and a 3-channel, 8-bit analog-to-digital converter (ADC). Communication with the DS1673 is established through a simple 3-wire interface.

The RTC provides seconds, minutes, hours, day, date, month, and year information with leap year compensation. The RTC also provides an alarm interrupt. This interrupt works when the DS1673 is powered by the system power supply or when in battery-backup operation, so the alarm can be used to wake up a system that is powered down.

Automatic backup and write protection of an external SRAM is provided through the VCCO, active-low CEOL, and active-low CEOH pins. The backup energy source used to power the RTC is also used to retain RAM data in the absence of VCC through the VCCO pin. The chip-enable outputs to RAM (active-low CEOL and active-low CEOH) are controlled during power transients to prevent data corruption.

Key Features
  • Provides 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
    • Power-Control Circuitry Supports System
    • Power-On from Day/Time Alarm
  • Microprocessor Monitor
    • Halts Microprocessor During Power Fail
    • Automatically Restarts Microprocessor after
    • Power Failure
    • Monitors Pushbutton for External Override
    • Halts and Resets an Out-of-Control
    • Microprocessor
  • NV RAM Control
    • Automatic Battery Backup and Write Protection
    • to External SRAM
  • 3-Channel, 8-Bit ADC
  • Simple 3-Wire Interface
  • +3.0V or +5.0V Operation
  • Underwriters Laboratories (UL®) Recognized

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
DS1673 
NV SRAM Control
Watchdog Timekeeper
 YY-MM-DD/ HH:MM:SS 3-Wire
3
5
 300 6 None 1 $3.44 @1k
See All Timekeeping & Real-Time Clocks (80)

Diagram
DS1673: Block Diagram
Block Diagram

Application Notes
  		• Application Note 58: Crystal Considerations with Dallas Real-Time Clocks (RTCs) - DS1673
  		• Application Note 100: DS1670 Portable System Controller - DS1673
  		• Application Note 504: Design Considerations for Dallas Semiconductor Real-Time Clocks - DS1673
  		• Application Note 505: Lithium Coin-Cell Batteries: Predicting an Application Lifetime - DS1673
  		• Application Note 701: Using the DS32kHz with Dallas Real-Time Clocks - DS1673
  		• Application Note 3816: Selecting a Backup Source for Real-Time Clocks - DS1673

    Design Guides
  		• Real-Time Clocks (PDF)

    Reliability Reports
  		• Reliability Report: DS1673.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

    DS1673 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1673S-5+T&R    
    		Active SOIC(W);20 pin;137 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0108 (PDF)
    Use pkgcode/variation: W20+3*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1673S-3    
    		Active SOIC(W);20 pin;137 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0108 (PDF)
    Use pkgcode/variation: W20-3*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1673S-5    
    		Active SOIC(W);20 pin;137 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0108 (PDF)
    Use pkgcode/variation: W20-3*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1673S-3+  
    		Active SOIC(W);20 pin;137 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0108 (PDF)
    Use pkgcode/variation: W20+3*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1673S-5+  
    		Active SOIC(W);20 pin;137 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0108 (PDF)
    Use pkgcode/variation: W20+3*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1673E-3    
    		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
    DS1673E-5    
    		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
    DS1673E-3/T&R    
    		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
    DS1673E-5/T&R    
    		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
    DS1673E-3+  
    		Active TSSOP;20 pin;45 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0116 (PDF)
    Use pkgcode/variation: U20+5*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1673E-3+T&R    
    		Active TSSOP;20 pin;45 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0116 (PDF)
    Use pkgcode/variation: U20+5*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1673E-5+  
    		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: Lead Free
    Materials Analysis
    DS1673E-5+T&R    
    		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: Lead Free
    Materials Analysis

    More Information
  		• Other Watchdog Clocks

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    2005-08-10
    This page last modified: 2009-05-05


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