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Maxim > Products > [Supervisors, Voltage Monitors, Sequencers] 
MAX811, MAX811L, MAX811M, MAX811R, MAX811S, MAX811T, MAX812, MAX812L, MAX812M, MAX812R, MAX812S, MAX812T
4-Pin µP Voltage Monitors with Manual Reset Input

4-Pin SOT Reset ICs with Manual Reset


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Data Sheet
FULL DATA SHEET (PDF, 192kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX811/MAX812 are low-power microprocessor (µP) supervisory circuits used to monitor power supplies in µP and digital systems. They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with 5V- powered or 3V-powered circuits. The MAX811/MAX812 also provide a debounced manual reset input.

These devices perform a single function: They assert a reset signal whenever the VCC supply voltage falls below a preset threshold, keeping it asserted for at least 140ms after VCC has risen above the reset threshold. The only difference between the two devices is that the MAX811 has an active-low RESET output (which is guaranteed to be in the correct state for VCC down to 1V), while the MAX812 has an active-high RESET output. The reset comparator is designed to ignore fast transients on VCC. Reset thresholds are available for operation with a variety of supply voltages.

Low supply current makes the MAX811/MAX812 ideal for use in portable equipment. The devices come in a 4-pin SOT143 package.

Key Features   Applications/Uses
  • Precision Monitoring of 3V, 3.3V, and 5V Power-Supply Voltages
  • 6µA Supply Current
  • 140ms Min Power-On Reset Pulse Width; active-low RESET Output (MAX811), RESET Output (MAX812)
  • Guaranteed Over Temperature
  • Guaranteed active-low RESET Valid to VCC = 1V (MAX811)
  • Power-Supply Transient Immunity
  • No External Components
  • 4-Pin SOT143 Package

 
  		• Computers: Desktop, Workstation, Server
  		• Controllers
  		• Critical µP and µC Power Monitoring
  		• Intelligent Instruments
  		• Portable Battery-Powered Equipment

    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 Supervisor Features Reset Thresh. Acc. (% @+25°C) Max. ICC (µA) Price**
    MAX811  2.5 to 3.3
    3.3 to 5.5     		Push-Pull  -  85ms to 300ms No Watchdog Manual Reset 1.5 15 $0.99 @ 1k
    MAX812   -  Push-Pull $0.99 @ 1k
    See All Supervisors (1 Monitored Voltage) (270)
    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.

    Diagram
    MAX811, MAX811L, MAX811M, MAX811R, MAX811S, MAX811T, MAX812, MAX812L, MAX812M, MAX812R, MAX812S, MAX812T: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  		• Application Note 655: Supervisor ICs Monitor Battery-Powered Equipment - MAX811
  		• Application Note 1050: Reset Circuit Ensures Valid Supply Voltage - MAX812
  		• Application Note 1858: Tiny IC Debounces Pushbutton Switch - MAX812

    Evaluation Kits
    none

    Design Guides
  		• Microprocessor Supervisory (PDF)

    Reliability Reports
  		• Reliability Report: MAX811.pdf MAX811R.pdf
  		• Show FIT data for:
  		• Request Reliability Report for:

    Software/Models
  		• MAX811S IBIS Model

    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: 1-45 of 45

    MAX811L Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX811LEUS+  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX811LEUS  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX811LEUS-T  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX811LEUS+T  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX811M Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX811MEUS+  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX811MEUS  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX811MEUS-T  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX811MEUS+T  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX811R Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX811REUS+  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX811REUS  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX811REUS-T  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX811REUS+T  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX811S Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX811SEUS-TG05  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX811SEUS+  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX811SEUS  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX811SEUS-T  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX811SEUS+T  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX811T Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX811TEUS-TG05  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX811TEUS-TG077  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX811TEUS+  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX811TEUS  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX811TEUS-T  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX811TEUS+T  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX812L Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX812LEUS  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX812LEUS+  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX812LEUS-T  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX812LEUS+T  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX812M Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX812MEUS+  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX812MEUS  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX812MEUS-T  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX812MEUS+T  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX812R Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX812REUS+  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX812REUS  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX812REUS+T  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX812REUS-T  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX812S Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX812SCUS+T  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX812SCUS+    
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX812SEUS+  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX812SEUS  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX812SEUS-T  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX812SEUS+T  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX812T Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX812TEUS+  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX812TEUS  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX812TEUS+T  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX812TEUS-T  
    		SOT;4 pin;8 mm²
    Outline Drawing: 21-0052 (PDF)
    Land Pattern: 90-0183 (PDF)
    Use pkgcode/variation: U4-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis

    Notes and Comments
  		• Active-low reset output (MAX811)
  		• Active-high reset output (MAX812)

    Related Products
    MAX6332, MAX6333, MAX6334 3-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits
    MAX6335, MAX6336, MAX6337 4-Pin, Ultra Low-Voltage, Low-Power µP Reset Circuits with Manual Reset
    MAX6326, MAX6327, MAX6328, MAX6346, MAX6347, MAX6348 3-Pin, Ultra-Low-Power SC70/SOT µP Reset Circuits
    MAX811, MAX811L, MAX811M, MAX811R, MAX811S, MAX811T, MAX812, MAX812L, MAX812M, MAX812R, MAX812S, MAX812T 4-Pin µP Voltage Monitors with Manual Reset Input
    MAX803L, MAX803M, MAX803R, MAX803S, MAX803T, MAX803Z, MAX809J, MAX809L, MAX809M, MAX809R, MAX809S, MAX809T, MAX809Z, MAX810L, MAX810M, MAX810R, MAX810S, MAX810T, MAX810Z 3-Pin Microprocessor Reset Circuits
    MAX6711, MAX6711L, MAX6711M, MAX6711R, MAX6711S, MAX6711T, MAX6711Z, MAX6712, MAX6712L, MAX6712M, MAX6712R, MAX6712S, MAX6712T, MAX6712Z, MAX6713, MAX6713L, MAX6713M, MAX6713R, MAX6713S, MAX6713T, MAX6713Z 4-Pin SC70 Microprocessor Reset Circuits with Manual Reset Input

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     Description 
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     Diagram 

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     Engineering Journals 
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    Document Ref.: 19-0411; Rev 4; 2006-05-04
    This page last modified: 2008-05-01


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