MAX6394US480D3/V+T Maxim Integrated, MAX6394US480D3/V+T Datasheet

MAX6394US480D3/V+T

Manufacturer Part Number

MAX6394US480D3/V+T

Description

Supervisory Circuits High-Accuracy uP Reset Circuit

Manufacturer

Maxim Integrated

Series

MAX6394r

Datasheet

1.MAX6394US480D3VT.pdf (7 pages)

Specifications of MAX6394US480D3/V+T

Rohs

yes

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The MAX6394 low-power CMOS microprocessor (µP)

supervisory circuit is designed to monitor power sup-

plies in µP and digital systems. It offers excellent circuit

reliability by providing 1% accurate thresholds over

temperature and by eliminating external components

and adjustments. The MAX6394 also provides a

debounced manual reset input.

This device performs a single function: it asserts a reset

signal whenever the V

preset threshold or whenever manual reset is asserted.

RESET remains asserted for an internally programmed

interval (reset timeout period) after V

the reset threshold or manual reset is deasserted. The

MAX6394’s open-drain RESET output can be pulled up

to a voltage higher than V

The MAX6394 comes with factory-trimmed reset thresh-

old voltages from 2.4V to 4.8V. Preset timeout periods

of 0.7ms, 14ms, 105ms, and 826ms are also available.

The device comes in a SOT143 package.

19-3202; Rev 0; 1/08

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

TOP VIEW

Computers

Controllers

Intelligent Instruments

Critical μP and μC Power Monitoring

Portable/Battery-Powered Equipment

RESET

GND

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Maxim Integrated Products

General Description

SOT143

MAX6394

supply voltage falls below a

Pin Configuration

Applications

High-Accuracy µP Reset Circuit

has risen above

VCC

o ±0.6% Threshold Accuracy at T

o ±1.0% Threshold Accuracy from -40°C to +125°C

o Small SOT143 Package

o Open-Drain RESET Output Can Exceed V

o Precision, Factory-Set V

o Four Reset Timeout Periods Available:

o Immune to Short V

o 5µA Supply Current

Note: This device is specified over the -40°C to +125°C operat-

ing temperature range.

+ Denotes a lead-free package.

Note: The "_ _ _" is a placeholder for the input voltage thresholds.

Nine threshold options are available. See Tables 1 and 2 for more

information.

Note: The "_" is a placeholder for the timeout option. Four

options are available. See the Timeout Options section for more

information.

Four standard versions are available (see the Standard Versions

Selector Guide section). Samples are generally available in standard

versions. Contact factory for availability of nonstandard versions.

Note: All devices are available in tape-and-reel only. Tape and

reel is offered in 2.5k increments.

MAX6394US_ _ _D_+T

Nine Options from 2.4V to 4.8V

0.7ms, 14ms, 105ms, and 826ms (minimum)

PART

CIRCUITRY

RESET

Typical Operating Circuit

MAX6394

GND

VCC

Ordering Information

Transients

LASER-

TRIMMED

RESISTORS

4 SOT143-4

PIN-PACKAGE

RESET

Reset Thresholds:

= +25°C

Features

RESET

PKG CODE

μP

U4-1

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MAX6394US480D3/V+T Summary of contents

Page 1

... Maxim Integrated Products ...

Page 2

High-Accuracy µP Reset Circuit ABSOLUTE MAXIMUM RATINGS VCC .......................................................................-0.3V to +6.0V RESET....................................................................-0.3V to +6.0V All Other Pins..............................................-0. Input Current (V ) .............................................................20mA CC Output Current (RESET)......................................................20mA Rate of Rise (V ) ...........................................................100V/µs CC Stresses beyond those listed under ...

Page 3

A SUPPLY CURRENT vs. TEMPERATURE -50 -30 - TEMPERATURE (°C) ...

Page 4

High-Accuracy µP Reset Circuit Detailed Description A microprocessor’s (µP’s) reset input starts the µ known state. The MAX6394 asserts a reset signal to prevent code-execution errors during power-up, power- down, or brownout conditions. RESET is guaranteed to be ...

Page 5

Table 1. ±0.6% of Thresholds ±0.6% OF THRESHOLD (V) SUFFIX MIN TYP 480 4.771 4.800 470 4.672 4.700 455 4.523 4.550 445 4.423 4.450 317 3.149 3.168 310 3.083 3.102 300 2.985 3.003 294 2.919 2.937 240 2.386 2.400 Timeout ...

Page 6

High-Accuracy µP Reset Circuit (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages ...

Page 7

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7 © 2008 Maxim Integrated Products High-Accuracy µ ...

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