Maxim MAX6343ZUT-T, MAX6343LUT-T, MAX6343MUT-T, MAX6343RUT-T, MAX6343SUT-T Datasheet

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General Description

The MAX6342–MAX6345 family of microprocessor (µP) supervisory circuits monitors power supplies in digital systems. These devices significantly improve system reliability and accuracy compared to separate ICs or discrete components.

The MAX6342–MAX6345 provide factory-trimmed V

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 lowbattery 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, opendrain reset and an active-high, push-pull reset, respectively. 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

♦ Small 6-Pin SOT23 Package ♦ Precision Factory-Set V

Reset Thresholds

Between 2.33V and 4.63V

♦ Guaranteed RESET Valid to V

= +1V

♦ 100ms min Reset Pulse Width ♦ Debounced CMOS-Compatible Manual-Reset

Input

♦ Voltage Monitor for Power-Fail or Low-Battery

Warning

MAX6342–MAX6345

6-Pin µP Reset Circuit with

Power-Fail Comparator

________________________________________________________________

Maxim Integrated Products

GND

PFI

( ) ARE FOR MAX6344 ONLY.

TOP VIEW

RESET (RESET)

PFO

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

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)

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.

MAX6342–MAX6345

6-Pin µP Reset Circuit with Power-Fail Comparator

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= +1.0V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C and VCC= +3V.) (Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

VCCto GND..............................................................-0.3V to +6V

RESET, RESET

(MAX6342/MAX6344/MAX6345) ......... -0.3V to (V

+ 0.3V)

RESET (MAX6343)................................................... -0.3V to +6V

MR, PFI, PFO ..............................................-0.3V to (V

+ 0.3V)

Input Current, V

..............................................................50mA

Output Current, RESET, RESET ..........................................50mA

Continuous Power Dissipation (T

= +70°C)

6-Pin SOT23 (derate 4mW/°C above +70°C).............320mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature Range (soldering, 10sec)................. +300°C

VCC> 2.7V, I

SOURCE

= 500µA

(MAX6342/MAX6345 only)

VCC> 1.2V, I

SOURCE

= 50µA

VCC> 4.5V, I

SINK

= 3.2mA

VCC> 2.7V, I

SINK

= 1.2mA

TA= -40°C to +85°C

VCC> 1.2V, I

SINK

= 100µA

TA= 0°C to +70°C

VCC= VTHto (VTH- 100mV)

µA

MAX634_S

MAX634_Z

MAX634_T

No load

MAX634_L

MAX634_R

MAX634_M

CONDITIONS

0.8 · V

0.4

0.3

0.4

100 180 280

Reset Timeout Period

µs

VCCto Reset Delay

2.25 2.38

2.30 2.33 2.36

2.55 2.70

2.59 2.63 2.67

2.85 3.00

25 40

Supply Current

1.2 5.5

1.0 5.5

Supply Voltage Range

2.89 2.93 2.97

3.00 3.15

3.03 3.08 3.13

4.25 4.50

30 50

4.56 4.63 4.70

Reset Threshold

4.50 4.75

4.31 4.38 4.45

UNITSMIN TYP MAXSYMBOLPARAMETER

TA= +25°C TA= -40°C to +85°C TA= +25°C TA= -40°C to +85°C TA= +25°C TA= -40°C to +85°C TA= +25°C TA= -40°C to +85°C TA= +25°C TA= -40°C to +85°C TA= +25°C TA= -40°C to +85°C

VCC= 3V VCC= 5.5V

VCC> 4.5V, I

SOURCE

= 800µA

(MAX6342/MAX6345 only)

0.8 · V

RESET and RESET Outputs Drive Capability (Note 2)

MAX6342–MAX6345

6-Pin µP Reset Circuit with

Power-Fail Comparator

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +1.0V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C and VCC= +3V.) (Note 1)

CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER

MAX6343 only, VCC> V

TH(MAX)

MR Pull-Up Resistance

0.7 · V

MR Input High

0.3 · V

MR Input Low

µA

LKG

Open-Drain RESET Output Leakage Current

kΩ

MR Minimum Pulse Width

µs

MR Glitch Rejection

0.1

µs

MR to Reset Delay

0.2

µs

PFI Input Threshold

1.2 1.25 1.3

PFI Leakage Current

±0.01 ±25

PFO Output Voltage

VCC= 4.5V, I

SINK

= 3.2mA

0.4

PFO Output Voltage

VCC= 4.5V, I

SOURCE

= 800µA

0.8 · V

PFO Output Short-Circuit Current

Output sink current

Output source current

PFI to PFO Delay

OVERDRIVE

= 15mV

µs

Typical Operating Characteristics

PFI

= VCC= +5V, TA= +25°C, unless otherwise noted.)

-40 10-15 35 60 85

SUPPLY CURRENT vs. SUPPLY VOLTAGE

AND TEMPERATURE

MAX6342-01

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

VCC = 5V

VCC = 3.3V

VCC = 2.5V

VCC = 1V

1sec/div

MAX6342-02

MAX6344L/MAX6345L

RESET OUTPUT VOLTAGE

vs. SUPPLY VOLTAGE

RESET

1V/div

1sec/div

MAX6342-03

MAX6342M/MAX6345M

RESET OUTPUT VOLTAGE

vs. SUPPLY VOLTAGE

RESET

1V/div

Note 1: Overtemperature limits are guaranteed by design and not production tested. Note 2: Apply to each part in accordance with threshold voltage, output configuration, and manual reset status selected.

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