General Description

The MAX803/MAX809/MAX810 are microprocessor (µP)

supervisory circuits used to monitor the power supplies

in µP and digital systems. They provide excellent circuit

reliability and low cost by eliminating external compo-

nents and adjustments when used with +5V, +3.3V,

+3.0V, or +2.5V powered circuits.

These circuits perform a single function: they assert a

below a preset threshold, keeping it asserted for at

old. Reset thresholds suitable for operation with a vari-

ety of supply voltages are available.

The MAX803 has an open-drain output stage, while the

MAX809/MAX810 have push-pull outputs. The

MAX803’s open-drain RESET output requires a pull-up

resistor that can be connected to a voltage higher than

output, while the MAX810 has an active-high RESET

output. The reset comparator is designed to ignore fast

Low supply current makes the MAX803/MAX809/

MAX810 ideal for use in portable equipment. The

MAX803 is available in a 3-pin SC70 package, and the

MAX809/MAX810 are available in 3-pin SC70 or SOT23

packages.

Applications

Computers

Controllers

Intelligent Instruments

Critical µP and µC Power Monitoring

Portable/Battery-Powered Equipment

Automotive

____________________________Features

o Precision Monitoring of +2.5V, +3V, +3.3V, and

+5V Power-Supply Voltages

o Fully Specified Over Temperature

o Available in Three Output Configurations

Open-Drain RESET Output (MAX803)

Push-Pull RESET Output (MAX809)

Push-Pull RESET Output (MAX810)

o 140ms min Power-On Reset Pulse Width

o 12µA Supply Current

o Power Supply Transient Immunity

o No External Components

o 3-Pin SC70 and SOT23 Packages

3-Pin Microprocessor Reset Circuits

________________________________________________________________ Maxim Integrated Products

1

TOP VIEW

RESET (RESET)

1

GND

MAX803

MAX809

MAX810

SC70-3/SOT23-3

2

3

( ) ARE FOR MAX810.

MAX803 AVAILABLE IN SC70-3 ONLY.

MAX803

MAX809

RESET

RESET

INPUT

GND

GND

*MAX803 ONLY

µP

Pin Configuration

Typical Operating Circuit

19-0344; Rev 5; 1/01

Note: These parts are offered in 2.5k or 10k reels, and must be

ordered in 2.5k or 10k increments. Order MAX803_EXR-T for

2.5k reels and MAX803_EXR-T10 for 10k reels. Insert the

desired suffix letter from the Selector Guide into the blank to

complete the part number. All versions of these products may

not be available at the time of announcement. Contact factory for

availability.

3 SC70-3

-40°C to +125°C

MAX803_EXR-T10

3 SC70-3

PIN-PACKAGE

TEMP. RANGE

-40°C to +125°C

MAX803_EXR-T

PART

3 SC70-3

-40°C to +125°C

MAX809_EXR-T10

3 SC70-3

-40°C to +125°C

MAX809_EXR-T

3 SOT23-3

-40°C to +105°C

MAX809_EUR-T10

3 SOT23-3

-40°C to +105°C

MAX809_EUR-T

3 SC70-3

-40°C to +125°C

MAX810_EXR-T10

3 SC70-3

-40°C to +125°C

MAX810_EXR-T

3 SOT23-3

-40°C to +105°C

MAX810_EUR-T10

3 SOT23-3

-40°C to +105°C

MAX810_EUR-T

Ordering Information

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.