_______________General Description

The MAX6301/MAX6302/MAX6303/MAX6304* low-

power microprocessor (µP) supervisory circuits provide

maximum adjustability for reset and watchdog functions.

The reset threshold can be adjusted to any voltage

above 1.22V, using external resistors. In addition, the

reset and watchdog timeout periods are adjustable

using external capacitors. A watchdog select pin

extends the watchdog timeout period to 500x. The reset

function features immunity to power-supply transients.

These four devices differ only in the structure of their reset

outputs (see

Selector Guide). The MAX6301–MAX6304

are available in the space-saving 8-pin µMAX package,

as well as 8-pin DIP/SO.

________________________Applications

Medical Equipment

Embedded Controllers

Intelligent Instruments

Critical µP Monitoring

Portable Equipment

Set-Top Boxes

Battery-Powered

Computers

Computers/Controllers

____________________________Features

o Adjustable Reset Threshold

o Adjustable Reset Timeout

o Adjustable Watchdog Timeout

o 500x Watchdog Timeout Multiplier

o 4µA Supply Current

o RESET or

RESET Output Options

o Push/Pull or Open-Drain Output Options

o Guaranteed

RESET Asserted At or Above

o Power-Supply Transient Immunity

o Watchdog Function Can Be Disabled

o DIP/SO/µMAX Packages Available

+5V, Low-Power µP Supervisory Circuits

with Adjustable Reset/Watchdog

________________________________________________________________

Maxim Integrated Products

1

0.1µF

MAX6301

MAX6302

MAX6303

MAX6304

RESET IN

SRT

GND

SWT

WDI

WDS

RESET

µP

I/O

RESET

(RESET)

R2

R1

MAX6301

ONLY

MAX6302

ONLY

8

7

6

5

1

2

3

4

WDS = 0 FOR NORMAL MODE

WDI = 1 FOR EXTENDED MODE

( ) ARE FOR MAX6302/MAX6304.

__________________Pin Configuration

1

2

8

7

RESET (RESET)

WDI

WDS

RESET IN

GND

SRT

SWT

MAX6301

MAX6302

MAX6303

MAX6304

DIP/SO/

µMAX

TOP VIEW

3

4

6

5

( ) ARE FOR MAX6302/MAX6304.

__________Typical Operating Circuit

19-1078; Rev 0; 6/96

PART

MAX6301CPA

MAX6301CSA

MAX6301CUA

0°C to +70°C

0°C to +70°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

8 Plastic DIP

8 SO

8 µMAX

______________Ordering Information

Ordering Information continued at end of data sheet.

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

MAX6301EPA

MAX6301ESA

-40°C to +85°C

-40°C to +85°C

8 Plastic DIP

8 SO

_____________________Selector Guide

FEATURE

MAX6301 MAX6302 MAX6303 MAX6304

Active-Low

Reset



—



—

Active-High

Reset

—



—



Open-Drain

Reset Output





—

—

Push/Pull

Reset Output

—

—





Pins-Package

8-DIP/SO/

µMAX

8-DIP/SO/

µMAX

8-DIP/SO/

µMAX

8-DIP/SO/

µMAX

* Patents pending