MAX6323-MAX6324 datasheet, PDF

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MAX6323-MAX6324: DescriptionuP Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset; File Size698KB，12 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html

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MAX6323-MAX6324 Overview

uP Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset

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19-1838; Rev 3; 3/04

µP Supervisory Circuits with Windowed

(Min/Max) Watchdog and Manual Reset

General Description

The MAX6323/MAX6324 microprocessor (µP) supervi-

sory circuits monitor power supplies and µP activity in

digital systems. A watchdog timer looks for activity out-

side an expected window of operation. Six laser-

trimmed reset thresholds are available with ±2.5%

accuracy from +2.32V to +4.63V. Valid

RESET

output is

guaranteed down to V

= +1.2V.

The

RESET

output is either push-pull (MAX6323) or

open-drain (MAX6324).

RESET

is asserted low when

falls below the reset threshold, or when the manual

reset input (MR) is asserted low.

RESET

remains assert-

ed for at least 100ms after V

rises above the reset

threshold and

is deasserted.

The watchdog pulse output (WDPO) utilizes an open-

drain configuration. It can be triggered either by a fast

timeout fault (watchdog input pulses are too close to

each other) or a slow timeout fault (no watchdog input

pulse is observed within the timeout period). The

watchdog timeout is measured from the last falling

edge of watchdog input (WDI) with a minimum pulse

width of 300ns.

WDPO

is asserted for 1ms when a fault

is observed. Eight laser-trimmed timeout periods are

available.

The MAX6323/MAX6324 are offered in a 6-pin SOT23

package and operate over the extended temperature

range (-40°C to +125°C).

♦

Min/Max (Windowed) Watchdog,

8 Factory-Trimmed Timing Options

♦

Pulsed Open-Drain, Active-Low Watchdog Output

♦

Power-On Reset

♦

Precision Monitoring of +2.5V, +3.0V, +3.3V,

and +5.0V Power Supplies

♦

Open-Drain or Push-Pull

RESET

Outputs

♦

Low-Power Operation (23µA typ)

♦

Debounced Manual Reset Input

♦

Guaranteed Reset Valid to V

= +1.2V

Features

MAX6323/MAX6324

Ordering Information

PART*

TEMP

RANGE

PIN-

PACKAGE

RESET

OUTPUT

Applications

Automotive

Industrial

Medical

Embedded Control Systems

MAX6323_UT__-T

-40°C to +125°C 6 SOT23-6 Push-Pull

MAX6324_UT__-T

-40°C to +125°C 6 SOT23-6 Open Drain

*These devices are factory trimmed to one of eight watchdog-

timeout windows and one of six reset voltage thresholds. Insert

the letter corresponding to the desired watchdog-timeout window

(A, B, C, D, E, F, G, or H) into the blank following the number

6323 or 6324 (see Watchdog Timeout table). Insert the two-digit

code (46, 44, 31, 29, 26, or 23) after the letters UT for the desired

nominal reset threshold (see Reset Threshold Range table at end

of data sheet).

Note:

There are eight standard versions of each device available

(see Standard Versions table). Sample stock is generally held on

standard versions only. Standard versions have an order incre-

ment requirement of 2500 pieces. Nonstandard versions have an

order increment requirement of 10,000 pieces. Contact factory for

availability of nonstandard versions.

Pin Configuration

TOP VIEW

RESET

Watchdog Timeout

SUFFIX

WATCHDOG TIMEOUT*

FAST

SLOW

MAX

MIN

UNITS

1.5

100

300

719

1.3

GND

MAX6323

MAX6324

WDPO

WDI

SOT23

Typical Operating Circuit appears at end of data sheet.

*See

Figure 1 for operation.

________________________________________________________________

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.

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