Maxim > Products > Supervisors, Voltage Monitors, Sequencers > MAX811, MAX812

MAX811, MAX812

4-Pin µP Voltage Monitors with Manual Reset Input

4-Pin SOT Reset ICs with Manual Reset

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

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 V_CC supply voltage falls below a preset threshold, keeping it asserted for at least 140ms after V_CC 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 V_CC down to 1V), while the MAX812 has an active-high RESET output. The reset comparator is designed to ignore fast transients on V_CC. 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.

Data Sheet

Download	Rev 4	(PDF, 144kB)
E-Mail

Key Features

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 V_CC = 1V (MAX811)
Power-Supply Transient Immunity
No External Components
4-Pin SOT143 Package

Applications/Uses

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 Thresh.
(V)

Reset Out

t_RESET

Watchdog Feature

Supervisor Features

Reset Thresh. Accur.
(%)

I_CC
(µA)

Budgetary Price

min

@ +25°C

max

See Notes

MAX811

2.5 to 3.3

3.3 to 5.5

Active Low

Push-Pull

85ms to 300ms

No Watchdog

Manual Reset

1.5

$1.01 @1k

MAX812

Active High

Push-Pull

$1.01 @1k

See All Supervisors (1 Monitored Voltage) (274)

Pricing 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

Typical Operating Circuit

Application Notes

Application Note 655		Supervisor ICs Monitor Battery-Powered Equipment
Application Note 1050		Reset Circuit Ensures Valid Supply Voltage
Application Note 1212		Pulsed Sensor Extends Battery Life
Application Note 1858		Tiny IC Debounces Pushbutton Switch

Product Guides

Microprocessor Supervisory (PDF)

Reliability Reports

Reliability Report:	MAX811.pdf MAX812.pdf
Show FIT data for:

Software/Models

MAX811S IBIS Model

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX811LEUS+			Active	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+T			Active	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-T			Active	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+			Active	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+T			Active	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-T			Active	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+			Active	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+T			Active	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-T			Active	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			Active	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
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX811SEUS+			Active	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+T			Active	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-T			Active	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-TG05			Active	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/GH9-T			Active	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			Active	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+			Active	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+T			Active	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-T			Active	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-TG05			Active	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
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX811TEUS-TG077			Active	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+			Active	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			Active	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			Active	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+			Active	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+T			Active	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-T			Active	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+			Active	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			Active	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			Active	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
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX812SCUS+T			Active	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+			Active	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+T			Active	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-T			Active	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+			Active	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			Active	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			Active	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:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
* 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.

Notes and Comments

Active-low reset output (MAX811)
Active-high reset output (MAX812)

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See All Supervisors (1 Monitored Voltage) (274 Products)

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More Information

Topmark Coding	MAX811
Topmark Coding	MAX812

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Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Document Ref.: 19-0411 Rev 4; 2006-05-04
This page last modified: 2010-05-21