Rainbow-electronics MAX6869 User Manual download pdf

General Description

The MAX6854–MAX6869 ultra-low-current (170nA, typ)

microprocessor (µP) supervisory circuits combine volt-

age monitoring, watchdog timer, and manual reset input

functions in a 5-pin SOT23 package. These devices

assert a reset signal whenever the monitored voltage

drops below the factory-trimmed reset threshold voltage,

manual reset is asserted, or the watchdog timer expires.

The reset output remains asserted for a minimum timeout

period after V

rises above the reset threshold and

manual reset is deasserted. Factory-trimmed reset

threshold voltages are offered from +1.575V to +4.625V

in approximately 100mV increments (see Threshold

Suffix Guide). Each device is offered with six minimum

reset timeout options, ranging from 10ms to 1200ms.

The MAX6854–MAX6869 are offered in a variety of con-

figurations (see Selector Guide). The MAX6854–

MAX6856 and MAX6861–MAX6869 provide a manual

reset input, MR. The MAX6864–MAX6869 offer a watch-

dog timer that monitors activity at the WDI input for code

execution errors. The MAX6864–MAX6869 offer watch-

dog timeout options of 3.3s or 209s (typ). The

MAX6861–MAX6863 feature a pin-selectable reset delay

period of 10ms or 150ms (min). Push-pull active-low,

push-pull active-high, and open-drain active-low reset

outputs are available.

Applications

Portable/Battery-Powered Equipment

PDAs/Cell Phones

MP3 Players/Pagers

Glucose Monitors/Patient Monitors

Features

♦ Ultra-Low 170nA (typ) Supply Current

♦ Reset Thresholds from +1.575V to +4.625V in

Approximately 100mV Increments

♦ 6 Minimum Reset Timeout Period Options from

10ms to 1200ms

♦ Manual Reset Option

♦ Watchdog Timer Option

♦ Pin-Selectable 10ms/150ms (min) Reset Timeout

Period (MAX6861/MAX6862/MAX6863)

♦ Immune to Short V

Transients

♦ Guaranteed Reset Valid to V

= +1.1V

♦ Three Reset Output Options:

Push-Pull RESET

Open-Drain RESET

♦ No External Components

♦ Small 5-Pin SOT23 Package

♦ Pin Compatible to the TPS3836–TPS3838

(MAX6861/MAX6862/MAX6863)

MAX6854–MAX6869

Nanopower µP Supervisory Circuits with

Optional Manual Reset, Watchdog Timer

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

PART

†

TEMP RANGE

PIN-PACKAGE

MAX6854UK_ _D_-T*

-40°C to +85°C

5 SOT23-5

MAX6855UK_ _D_-T*

-40°C to +85°C

5 SOT23-5

19-3139; Rev 0; 2/04

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.

Ordering Information continued on last page.

†

Insert reset threshold suffix (see Table 2, Threshold Suffix

Guide) after UK. Insert the number corresponding to the

desired reset timeout period (see Table 4, Reset Timeout

Period) after “D.”

Note: Sample stock is generally held on standard versions

only (see Table 5, Standard Versions Table). Standard versions

have an order increment of 2500 pieces. Nonstandard versions

have an order increment of 10,000 pieces. Contact factory for

availability of nonstandard versions.

*Future product—Contact factory for availability.

Pin Configurations appear at the end of data sheet.

Selector Guide appears at the end of data sheet.

Typical Operating Circuit

MAX6864

MAX6867

µP

GND

MANUAL

RESET

I/O

0.1µF

RESET

WDI

1 2 3 4 5 6 ... 16 17

MAX6854–MAX6869 1

Summary of Contents

Page 1 - MAX6854–MAX6869

General DescriptionThe MAX6854–MAX6869 ultra-low-current (170nA, typ)microprocessor (µP) supervisory circuits combine volt-age monitoring, watchdog ti

Page 2

MAX6854–MAX6869Nanopower µP Supervisory Circuits withOptional Manual Reset, Watchdog Timer10 _________________________________________________________

Page 3

MAX6854–MAX6869Nanopower µP Supervisory Circuits withOptional Manual Reset, Watchdog Timer____________________________________________________________

Page 4

MAX6854–MAX6869Transient ImmunityIn addition to issuing a reset to the µP during power-up,power-down, and brownout conditions, the MAX6854–MAX6869 are

Page 5

input at different points in the program, rather thanpulsing the watchdog input high-low-high or low-high-low. This technique avoids a stuck loop, in

Page 6

MAX6854–MAX6869Nanopower µP Supervisory Circuits withOptional Manual Reset, Watchdog Timer14 _________________________________________________________

Page 7

MAX6854–MAX6869Nanopower µP Supervisory Circuits withOptional Manual Reset, Watchdog Timer____________________________________________________________

Page 8

MAX6854–MAX6869Nanopower µP Supervisory Circuits withOptional Manual Reset, Watchdog Timer16 _________________________________________________________

Page 9

MAX6854–MAX6869Nanopower µP Supervisory Circuits withOptional Manual Reset, Watchdog TimerMaxim cannot assume responsibility for use of any circuitry

Page 10

MAX6854–MAX6869Nanopower µP Supervisory Circuits withOptional Manual Reset, Watchdog Timer2 __________________________________________________________

Page 11

MAX6854–MAX6869Nanopower µP Supervisory Circuits withOptional Manual Reset, Watchdog Timer____________________________________________________________

Page 12

NORMALIZED WATCHDOG TIMEOUT PERIODvs. TEMPERATUREMAX6854 toc04TEMPERATURE (°C)NORMALIZED tWD603510-150.60.81.01.21.41.61.80.4-40 8510 100 1000MAXIMUM

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MAX6854–MAX6869Nanopower µP Supervisory Circuits withOptional Manual Reset, Watchdog Timer____________________________________________________________

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MAX6854–MAX6869Nanopower µP Supervisory Circuits withOptional Manual Reset, Watchdog Timer6 __________________________________________________________

Page 15

MAX6854–MAX6869Nanopower µP Supervisory Circuits withOptional Manual Reset, Watchdog Timer____________________________________________________________

Page 16

MAX6854–MAX6869Nanopower µP Supervisory Circuits withOptional Manual Reset, Watchdog Timer8 __________________________________________________________

Page 17

MAX6854–MAX6869Nanopower µP Supervisory Circuits withOptional Manual Reset, Watchdog Timer____________________________________________________________

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Rainbow-electronics MAX6869 User Manual

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