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General Description

The MAX6342–MAX6345 family of microprocessor (µP)

supervisory circuits monitors power supplies in digital sys-

tems. These devices significantly improve system reliabili-

ty and accuracy compared to separate ICs or discrete

components.

reset threshold voltages from 2.33V to 4.63V and operate

with supply voltages between +1V and +5.5V. A +1.25V

threshold detector allows for a power-fail warning, for low-

battery detection, or for monitoring another power supply.

The MAX6342 contains an MR input and an active-low

push-pull reset. The MAX6343 and MAX6344 are identical

to the MAX6342 except they provide an active-low, open-

drain reset and an active-high, push-pull reset, respective-

ly. The MAX6345 provides a second reset output in place

of the MR input to give it an active-high push-pull reset

and an active-low push-pull reset.

All of the devices are packaged in a miniature 6-pin

SOT23.

Applications

Portable Computers

Telecom Equipment

Networking Equipment

Portable/Battery-Powered Equipment

Multivoltage Systems

Embedded Control Systems

Features

o Small 6-Pin SOT23 Package

Between 2.33V and 4.63V

o 100ms min Reset Pulse Width

o Debounced CMOS-Compatible Manual-Reset

Input

o Voltage Monitor for Power-Fail or Low-Battery

Warning

6-Pin µP Reset Circuit with

Power-Fail Comparator

________________________________________________________________

Maxim Integrated Products

1

GND

PFI

16

5

( ) ARE FOR MAX6344 ONLY.

TOP VIEW

2

34

RESET (RESET)

PFO

MR

MAX6342

MAX6343

MAX6344

SOT23-6

Selector Guide 1

Selector Guide 2

19-1568; Rev 0; 10/99

PART

MAX6342_UT-T

MAX6343_UT-T

MAX6344_UT-T

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

TEMP. RANGE

PIN-PACKAGE

6 SOT23-6

6 SOT23-6

6 SOT23-6

Note: The MAX6342–MAX6345 are available with factory-set

reset thresholds from 2.33V to 4.63V (see Selector Guides 1, 2).

Insert the letter corresponding to the desired nominal reset

threshold into the blank following the part number. There is a

2500 piece order increment required for the SOT package. SOT

Top Marks table appears at end of data sheet. All versions of

these products may not be available at time of announcement.

Contact factory for availability.

Pin Configurations

Ordering Information

MAX6345_UT-T

-40°C to +85°C

6 SOT23-6

SUFFIX

RESET THRESHOLD (V)

L

4.63

M

4.38

T

3.08

S

2.93

R

2.63

Z

2.33

PART

PUSH-PULL

RESET OUTPUT

OPEN-DRAIN

RESET OUTPUT

PUSH-PULL RESET

OUTPUT

MAX6342

—

—

MAX6343

—

—

MAX6344

—

—

MAX6345

—

MANUAL-RESET

INPUT

—

Typical Operating Circuit appears at end of data sheet.

Pin Configurations continued at end of data sheet.