MAX812TEUS-T Maxim Integrated Products, MAX812TEUS-T Datasheet

MAX812TEUS-T

Manufacturer Part Number

MAX812TEUS-T

Description

Microprocessor voltage monitor with manual reset input. Reset threshold voltage 3.08V. Push-pull active-high reset output.

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX812TEUS-T.pdf (8 pages)

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________________General Description

The MAX811/MAX812 are low-power microprocessor

(µP) supervisory circuits used to monitor power sup-

plies 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

below a preset threshold, keeping it asserted for at

least 140ms after V

old. 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

1V), while the MAX812 has an active-high RESET out-

put. The reset comparator is designed to ignore fast

transients on V

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.

________________________Applications

___________Typical Operating Circuit

19-0411; Rev 4; 12/05

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Computers

Controllers

Intelligent Instruments

Critical µP and µC Power Monitoring

Portable/Battery-Powered Equipment

PUSHBUTTON

MAX811

MAX812

SWITCH

GND

________________________________________________________________ Maxim Integrated Products

. Reset thresholds are available for

(RESET)

RESET

has risen above the reset thresh-

supply voltage falls

( ) ARE FOR MAX812

RESET

INPUT

GND

µP

down to

4-Pin µP Voltage Monitors

with Manual Reset Input

♦ Precision Monitoring of 3V, 3.3V, and 5V

♦ 6µA Supply Current

♦ 140ms Min Power-On Reset Pulse Width;

♦ Guaranteed Over Temperature

♦ Guaranteed R R E E S S E E T T Valid to V

♦ Power-Supply Transient Immunity

♦ No External Components

♦ 4-Pin SOT143 Package

_______________Ordering Information

*This part offers a choice of five different reset threshold volt-

ages. Select the letter corresponding to the desired nominal

reset threshold voltage, and insert it into the blank to complete

the part number.

Devices are available in both leaded and lead-free packaging.

Specify lead-free by replacing “-T” with “+T” when ordering.

___________________Pin Configuration

____________________________Features

MAX811_EUS-T

MAX812_EUS-T

Power-Supply Voltages

R R E E S S E E T T Output (MAX811), RESET Output (MAX812)

PART*

TOP VIEW

( ) ARE FOR MAX812

NOTE: SEE LAST PAGE FOR MARKING INFORMATION.

(RESET) RESET

SUFFIX

GND

RESET THRESHOLD

-40°C to +85°C

TEMP RANGE

SOT143

MAX811

MAX812

VOLTAGE (V)

4.63

4.38

3.08

2.93

2.63

= 1V (MAX811)

PIN-PACKAGE

4 SOT143

Related parts for MAX812TEUS-T

MAX812TEUS-T Summary of contents

Page 1

... MAX812 RESET (RESET) MR GND PUSHBUTTON SWITCH ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 4-Pin µP Voltage Monitors with Manual Reset Input ____________________________Features ♦ Precision Monitoring of 3V, 3.3V, and 5V Power-Supply Voltages ♦ ...

Page 2

Voltage Monitors with Manual Reset Input ABSOLUTE MAXIMUM RATINGS Terminal Voltage (with respect to GND) V ......................................................................-0.3V to 6.0V CC All Other Inputs.......................................-0. .......................................................20mA Input Current, V CC, Output Current, RESET or RESET .......................................20mA Stresses ...

Page 3

ELECTRICAL CHARACTERISTICS (continued for L/M versions 3.3V for T/S versions Typical values are +25°C.) (Note 1) A PARAMETER SYMBOL V RESET Output Voltage (MAX811) V Note 1: Production testing ...

Page 4

Voltage Monitors with Manual Reset Input __________________________________________Typical Operating Characteristics (T = +25°C, unless otherwise noted.) A SUPPLY CURRENT vs. TEMPERATURE (MAX81_R/S/T) 3 3. 3.3V CC 2.0 1.5 1.0 0 ...

Page 5

Pin Description PIN NAME MAX811 MAX812 1 1 GND Ground Active-Low Reset Output. RESET remains low while V RESET MR is held low. RESET remains low for the Reset Active Timeout Period (t 2 — conditions are terminated. Active-High ...

Page 6

Voltage Monitors with Manual Reset Input +25° MAX81 _L MAX81 _R/S 100 RESET COMPARATOR OVERDRIVE , V Figure 1. Maximum Transient Duration without Causing ...

Page 7

Interfacing to µPs with Bidirectional Reset Pins µPs with bidirectional reset pins (such as the Motorola 68HC11 series) can contend with the MAX811/MAX812 reset outputs. If, for example, the MAX811 RESET out- put is asserted high and the µP wants ...

Page 8

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2005 Maxim Integrated Products ø ...

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