General Description

The MAX6340/MAX6421–MAX6426 low-power micro-

processor supervisor circuits monitor system voltages

from 1.6V to 5V. These devices perform a single function:

age falls below its reset threshold. The reset output

rises above the reset threshold. The reset timeout is exter-

nally set by a capacitor to provide more flexibility.

The MAX6421/MAX6424 have an active-low, push-

pull reset output. The MAX6422 has an active-high,

push-pull reset output and the MAX6340/MAX6423/

MAX6425/MAX6426 have an active-low, open-drain

reset output. The MAX6421/MAX6422/MAX6423 are

offered in 4-pin SC70 or SOT143 packages. The

MAX6340/MAX6424/MAX6425/MAX6426 are available

in 5-pin SOT23-5 packages.

Applications

Portable Equipment

Battery-Powered Computers/Controllers

Automotive

Medical Equipment

Intelligent Instruments

Embedded Controllers

Critical µP Monitoring

Set-Top Boxes

Computers

Features

o Monitor System Voltages from 1.6V to 5V

o Capacitor-Adjustable Reset Timeout Period

o Low Quiescent Current (1.6µA typ)

o Three RESET Output Options

Push-Pull RESET

Push-Pull RESET

Open-Drain RESET

o Small 4-Pin SC70, 4-Pin SOT143, and 5-Pin SOT23

Packages

o MAX6340 Pin Compatible with LP3470

o MAX6424/MAX6425 Pin Compatible with

NCP300–NCP303, MC33464/MC33465,

S807/S808/S809, and RN5VD

o MAX6426 Pin Compatible with PST92XX

Low-Power, SC70/SOT µP Reset Circuits with

Capacitor-Adjustable Reset Timeout Delay

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

GND

( ) ARE FOR THE MAX6422

SRT

MAX6421X

MAX6422X

MAX6423X

SC70

TOP VIEW

2

3

RESET

(RESET)

Pin Configurations

19-2440; Rev 2; 10/02

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.

Typical Operating Circuit appears at end of data sheet.

Selector Guide appears at end of data sheet.

PART

TEMP RANGE

PIN-PACKAGE

MAX6340UK_ _-T

-40°C to +125°C

5 SOT23-5

MAX6421XS_ _-T

-40°C to +125°C

4 SC70-4

MAX6421US_ _-T

-40°C to +125°C

4 SOT143-4

MAX6422XS_ _-T

-40°C to +125°C

4 SC70-4

MAX6422US_ _-T

-40°C to +125°C

4 SOT143-4

MAX6423XS_ _-T

-40°C to +125°C

4 SC70-4

MAX6423US_ _-T

-40°C to +125°C

4 SOT143-4

MAX6424UK_ _-T

-40°C to +125°C

5 SOT23-5

MAX6425UK_ _-T

-40°C to +125°C

5 SOT23-5

MAX6426UK_ _-T

-40°C to +125°C

5 SOT23-5

Note: The MAX6340/MAX6421–MAX6426 are available with fac-

tory-trimmed reset thresholds from 1.575V to 5.0V in approxi-

mately 0.1V increments. Insert the desired nominal reset

threshold suffix (from Table 1) into the blanks. There are 50 stan-

dard versions with a required order increment of 2500 pieces.

Sample stock is generally held on standard versions only (see

Standard Versions Table). Required order increment is 10,000

pieces for nonstandard versions. Contact factory for availability.

All devices are available in tape-and-reel only.

Pin Configurations continued at end of data sheet.