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Maxim > Products > Supervisors, Voltage Monitors, Sequencers 
DS1814, DS1819
5 Volt and 3.3 Volt MicroMonitor


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Data Sheet
FULL DATA SHEET (PDF, 160kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The DS1814 5-Volt MicroMonitor and the DS1819 3.3V MicroMonitor monitor three vital conditions for a microprocessor: power supply, software execution, and external override. First, a precision temperature-compensated reference and comparator circuit monitor the status of VCC. When an out-of-tolerance condition occurs, an internal power-fail signal is generated which forces the reset(s) to an active state. When VCC returns to an in-tolerance condition, the reset signal is kept in the active state for a minimum of 140ms to allow the power supply and processor to stabilize. The DS1814/DS1819 ‘A' and ‘C' perform pushbutton reset control. They debounce the pushbutton input and generate an active reset pulse width of 140ms minimum. The DS1814/9 'A' and 'B' versions perform a watchdog function. The watchdog is an internal timer that forces the reset signals to the active state if the strobe input does not change state every 1.12 seconds. The watchdog timer function can be disabled by leaving the watchdog strobe input disconnected.

Key Features
  • Halts and restarts an out-of-control microprocessor
  • Holds microprocessor in check during power transients
  • Automatically restarts microprocessor after power failure
  • Monitors pushbutton for external override
  • Accurate 5%, 10%, or 20% (3V only) microprocessor power monitoring
  • Eliminates the need for discrete components
  • 20% tolerance for use with 3.0V systems
  • Pin- and function-compatible with the MAX823/24/25 products
  • Low cost SOT-23-5 package
  • Industrial temperature range: -40°C to +85°C

Key Specifications:   Supervisors (1 Monitored Voltage)
Part Number Reset Threshold Range (V) Active-Low Reset Output Active-High Reset Output Min. Reset Timeout Range Watchdog Feature Nom. Watchdog Timeout Range Supervisor Features Reset Thresh. Acc. (% @+25°C) Max. ICC (µA) RoHS Available Package Operating Temp. Range (°C) Price**
DS1814A  3.3 to 5.5 Push-Pull  -  85ms to 300ms Input (WDI) 1s to 2s Manual Reset 2.5 15 Yes SOT-23/5 -40 to +85
0 to +70 		$0.72 @ 1k
DS1814B  3.3 to 5.5 Push-Pull Input (WDI) 1s to 2s  -  15 $0.72 @ 1k
DS1814C  3.3 to 5.5 Push-Pull No Watchdog  -  Manual Reset 15 $0.72 @ 1k
DS1819A  2.5 to 3.3  -  Input (WDI) 1s to 2s Manual Reset 12 $0.61 @ 1k
DS1819B  2.5 to 3.3 Push-Pull Input (WDI) 1s to 2s  -  12 $0.72 @ 1k
DS1819C  2.5 to 3.3 Push-Pull No Watchdog  -  Manual Reset 12 $0.72 @ 1k
See All Supervisors (1 Monitored Voltage) (268)
Notes:
**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Application Notes
  		• Application Note 164: Using the DS1814 MicroMonitor to Control Microprocessor Resets - DS1814A, DS1814B, DS1814C
  		• Application Note 3316: Dallas Semiconductor Microprocessor Supervisor Selection Guide - DS1814A, DS1814B, DS1814C, DS1819A, DS1819B, DS1819C

    Evaluation Kits
    none

    Design Guides
  		• MICROPROCESSOR SUPERVISORY (PDF)

    Reliability Reports
  		• Reliability Report: DS1814.pdf DS1819.pdf
  		• Request Reliability Report for:

    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: 1-59 of 59

    DS1814A Notes Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1814AR-5/T&R   5V-5%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1814AR-10-U+  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1814AR-5-U+  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1814AR-5+T&R   5V-5%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1814AR-10/T&R   5V-10%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1814AR-5-U   5V-5%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1814AR-10-U   5V-10%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1814B Notes Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1814BR-5/T&R   5V-5%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1814BR-10-U+  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1814BR-5-U+  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1814BR-5+T&R   5V-5%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1814BR-10+T&R   5V-10%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1814BR-10/T&R   5V-10%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1814BR-5-U   5V-5%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1814BR-10-U   5V-10%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1814C Notes Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1814CR-5-U   5V-5%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1814CR-5+T&R   5V-5%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1814CR-5/T&R   5V-5%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1814CR-10-U+  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1814CR-5-U+  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1814CR-10+T&R   5V-10%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1814CR-10/T&R   5V-10%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1814CR-10-U   5V-10%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1819A Notes Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1819AR-10+T&R   3.3V-10%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1819AR-20+T&R   3.3V-20%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1819AR-10-U+  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1819AR-20-U+  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1819AR-5-U+  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1819AR-5+T&R   3.3V-5%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1819AR-5-U   3.3V-5%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1819AR-10-U   3.3V-10% Less Than 3k
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1819AR-20-U   3.3V-20%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1819AR-20/T&R   3.3V-20%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1819AR-10/T&R   3.3V-10% 3k Per Reel
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1819AR-5/T&R   3.3V-5%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1819B Notes Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1819BR-10/T&R   3.3V-10%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1819BR-20/T&R   3.3V-20%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1819BR-5+T&R   3.3V-5%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1819BR-20+T&R   3.3V-20%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1819BR-10+T&R   3.3V-10%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1819BR-10-U   3.3V-10%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1819BR-5-U   3.3V-5%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1819BR-20-U   3.3V-20%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1819BR-10-U+  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1819BR-20-U+  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1819BR-5-U+  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1819BR-5/T&R   3.3V-5%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1819C Notes Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1819CR-20+T&R   3.3V-20%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1819CR-20/T&R   3.3V-5%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1819CR-10-U   3.3V-10%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1819CR-5-U+  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1819CR-20-U+  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1819CR-10-U+  
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1819CR-5-U   3.3V-5%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1819CR-10/T&R   3.3V-10%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1819CR-5/T&R   3.3V-20%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1819CR-10+T&R   3.3V-10%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1819CR-5+T&R   3.3V-5%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5+1*
    		-40°C to +85°C See data sheet
    Materials Analysis
    DS1819CR-20-U   3.3V-20%
    		SOT-23;5 pin;
    Dwg: 21-0057F (PDF)
    Use pkgcode/variation: U5-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis

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    1999-11-19
    This page last modified: 2007-10-09




             


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