MAX809 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX809

3-Pin Microprocessor Reset Circuits

Maxim Integrated 

19-0344; Rev 6; 12/05

3-Pin Microprocessor Reset Circuits

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

reset signal whenever the VCC supply voltage declines

below a preset threshold, keeping it asserted for at

least 140ms after VCC has risen above the reset thresh-

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

VCC. The MAX803/MAX809 have an active-low RESET

output, while the MAX810 has an active-high RESET

output. The reset comparator is designed to ignore fast

transients on VCC, and the outputs are guaranteed to

be in the correct logic state for VCC down to 1V.

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

Typical Operating Circuit

VCC

VCC

MAX803

MAX809

RESET

VCC

RPULL-UP*

µP

RESET

INPUT

____________________________Features

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

+5V Power-Supply Voltages

♦ Fully Specified Over Temperature

♦ Available in Three Output Configurations

Open-Drain RESET Output (MAX803)

Push-Pull RESET Output (MAX809)

Push-Pull RESET Output (MAX810)

♦ 140ms min Power-On Reset Pulse Width

♦ 12µA Supply Current

♦ Guaranteed Reset Valid to VCC = +1V

♦ Power Supply Transient Immunity

♦ No External Components

♦ 3-Pin SC70 and SOT23 Packages

Ordering Information

PART

TEMP. RANGE PIN-PACKAGE

MAX803_EXR-T

-40°C to +125°C 3 SC70-3

MAX803_EXR-T10 -40°C to +125°C 3 SC70-3

MAX809_EXR-T

-40°C to +125°C 3 SC70-3

MAX809_EXR-T10 -40°C to +125°C 3 SC70-3

MAX809_EUR-T

-40°C to +105°C 3 SOT23-3

MAX809_EUR-T10 -40°C to +105°C 3 SOT23-3

MAX810_EXR-T

-40°C to +125°C 3 SC70-3

MAX810_EXR-T10 -40°C to +125°C 3 SC70-3

MAX810_EUR-T

-40°C to +105°C 3 SOT23-3

MAX810_EUR-T10 -40°C to +105°C 3 SOT23-3

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.

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

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

Pin Configuration

TOP VIEW

GND 1

MAX803

MAX809

MAX810

3 VCC

GND

GND

RESET (RESET) 2

*MAX803 ONLY

( ) ARE FOR MAX810.

SC70-3/SOT23-3

MAX803 AVAILABLE IN SC70-3 ONLY.

________________________________________________________________ Maxim Integrated Products 1

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.

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