MAX6823WUK+T Maxim Integrated Products, MAX6823WUK+T Datasheet

MAX6823WUK+T

Manufacturer Part Number

MAX6823WUK+T

Description

IC UP SUPERVISOR SOT23-5

Manufacturer

Maxim Integrated Products

Type

Simple Reset/Power-On Resetr

Datasheet

1.MAX6825SUKT.pdf (9 pages)

Specifications of MAX6823WUK+T

Number Of Voltages Monitored

Output

Push-Pull, Totem Pole

Reset

Active Low

Reset Timeout

140 ms Minimum

Voltage - Threshold

1.67V

Operating Temperature

-40°C ~ 125°C

Mounting Type

Surface Mount

Package / Case

SOT-23-5, SC-74A, SOT-25

Monitored Voltage

1.8 V, 2.5 V, 3 V, 3.3 V, 5 V

Undervoltage Threshold

1.61 V

Overvoltage Threshold

1.72 V

Output Type

Active Low, Push-Pull

Manual Reset

Resettable

Watchdog

Battery Backup Switching

No Backup

Power-up Reset Delay (typ)

320 ms

Supply Voltage (max)

5.5 V

Supply Voltage (min)

1 V

Supply Current (typ)

10 uA

Maximum Power Dissipation

571 mW

Maximum Operating Temperature

+ 125 C

Mounting Style

SMD/SMT

Minimum Operating Temperature

- 40 C

Power Fail Detection

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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The MAX6821–MAX6825 are low-voltage microprocessor

(µP) supervisory circuits that combine voltage monitor-

ing, watchdog timer, and manual reset input functions in

a 5-pin SOT23 package. Microprocessor supervisory cir-

cuits significantly improve system reliability and accura-

cy compared to separate ICs or discrete components.

These devices assert a reset signal whenever the moni-

tored voltage drops below its preset threshold, keeping it

asserted for a minimum timeout period after V

above the threshold. In addition, a watchdog timer moni-

tors against code execution errors. A debounced manual

reset is also available. The MAX6821–MAX6825 monitor

voltages from +1.8V to +5.0V. These outputs are guaran-

teed to be in the correct state for V

Nine preprogrammed reset threshold voltages are

available (see the Threshold Suffix Guide). The

MAX6821, MAX6822, and MAX6823 all have a manual

reset input and a watchdog timer. The MAX6821 has

push-pull RESET, the MAX6822 has open-drain RESET,

and the MAX6823 has push-pull RESET. The MAX6824

has a watchdog timer and both push-pull RESET and

push-pull RESET. The MAX6825 has a manual reset

input and both push-pull RESET and push-pull RESET.

The Selector Guide explains the functions offered in

this series of parts.

19-1868; Rev 2; 12/05

Typical Operating Circuit appears at end of data sheet.

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.

________________________Applications

Pin Configurations continued at end of data sheet.

Set-Top Boxes

Computers and

Controllers

Embedded Controllers

Intelligent Instruments

TOP VIEW

(RESET) MAX6821 ONLY

RESET(RESET)

________________________________________________________________ Maxim Integrated Products

GND

Low-Voltage SOT23 µP Supervisors with

General Description

Pin Configurations

SOT23-5

MAX6821

MAX6822

MAX6823

Automotive Systems

Critical µP Monitoring

Portable/Battery-

Powered Equipment

Manual Reset and Watchdog Timer

down to +1.0V.

WDI

rises

o Monitors +1.8V, +2.5V, +3.0V, +3.3V, +5.0V

o 140ms (min) Reset Timeout Delay

o 1.6s Watchdog Timeout Period

o Manual Reset Input

o Three Reset Output Options

o Guaranteed Reset Valid to V

o Immune to Short Negative V

o No External Components

o Small 5-Pin SOT23 Packages

*Insert the desired suffix letter (from the table below) into the blank

to complete the part number

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

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

Note: Bold indicates standard versions. Samples are typically

available for standard versions only. All parts require a 2.5k

minimum order increment. Contact factory for availability.

Selector Guide appears at end of data sheet.

MAX6821_UK-T

MAX6822_UK-T

MAX6823_UK-T

MAX6824_UK-T

MAX6825_UK-T

Supplies

(MAX6821/MAX6822/MAX6823/MAX6824)

(MAX6821/MAX6822/MAX6823/MAX6825)

Push-Pull RESET

Open-Drain RESET

PART*

SUFFIX

Threshold Suffix Guide

TEMP RANGE

-40°C to +125°C

Ordering Information

THRESHOLD (V)

Transients

= +1.0V

RESET

4.63

4.38

3.08

2.93

2.63

2.32

2.19

1.67

1.58

PIN-PACKAGE

5 SOT23-5

Features

Related parts for MAX6823WUK+T

MAX6823WUK+T Summary of contents

Page 1

... MAX6821 ONLY Pin Configurations continued at end of data sheet. Typical Operating Circuit appears at end of data sheet. ________________________________________________________________ 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. o Monitors +1.8V, +2.5V, +3.0V, +3.3V, +5.0V ...

Page 2

Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer ABSOLUTE MAXIMUM RATINGS V to GND ...........................................................-0.3V to +6.0V CC Open-Drain RESET................................................-0.3V to +6.0V Push-Pull RESET, RESET, MR, WDI ...........-0. Input Current (V ) .............................................................20mA CC Output Current ...

Page 3

Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer ELECTRICAL CHARACTERISTICS (continued +4.5V to +5.5V for MAX682_L/ +1.53V to +2.0V for MAX682_W/ -40°C to +125°C, unless otherwise specified. Typical values are at T ...

Page 4

Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer (T = +25°C, unless otherwise noted.) A SUPPLY CURRENT vs. TEMPERATURE +5V, L VERSION +3.3V, S VERSION CC 7 ...

Page 5

Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer PIN NUMBERS MAX6821 MAX6822 MAX6823 MAX6824 MAX6825 Detailed Description RESET ...

Page 6

Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer (MAX6821–MAX6823, MAX6825) WDI (MAX6821–MAX6824) Figure 1. Functional Diagram Disable the watchdog function by leaving WDI uncon- nected or by three-stating the driver connected to WDI. ...

Page 7

Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer RST RESET WDI *RESET IS THE INVERSE OF RESET. Figure 3. Watchdog Timing Relationship Resets are issued to the µP during power-up, power- down, and ...

Page 8

Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer ACTIVE-LOW FUNCTION RESET MAX6821 — MAX6822 — ✔ MAX6823 ✔ MAX6824 ✔ MAX6825 TOP VIEW RESET GND RESET Chip Information TRANSISTOR COUNT: 750 PROCESS: BiCMOS 8 _______________________________________________________________________________________ ACTIVE-HIGH OPEN-DRAIN RESET ...

Page 9

... 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. 9 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc ...

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