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

Design Resources

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)
Email

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

$1.52 @1k

MAX812

Active High

Push-Pull

$1.44 @1k

See All Supervisors (1 Monitored Voltage) (275)

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

Notes and Comments

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

More Information

Topmark Coding	MAX811
Topmark Coding	MAX812

Didn't Find What You Need?

Information Index

Overview		Design Resources		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Technical Documents Evaluation Kits 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