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MAX6715A–MAX6729A/

MAX6797A

Dual/Triple, Ultra-Low-Voltage, SOT23 μP

Supervisory Circuits

General Description

The MAX6715A–MAX6729A/MAX6797A are ultra-low-

voltage microprocessor (μP) supervisory circuits designed to

monitor two or three system power-supply voltages. These

devices assert a system reset if any monitored supply falls

below its factory-trimmed or adjustable threshold and main-

tain reset for a minimum timeout period after all supplies rise

above their thresholds. The integrated dual/triple superviso-

ry circuits significantly improve system reliability and reduce

size compared to separate ICs or discrete components.

These devices monitor primary supply voltages (V

CC1

)

from 1.8V to 5.0V and secondary supply voltages (V

from 0.9V to 3.3V with factory-trimmed reset threshold

voltage options (see the

Reset Voltage Threshold Suffix

Guide).

An externally adjustable RSTIN input option

allows customers to monitor a third supply voltage down

to 0.62V. These devices are guaranteed to be in the cor-

rect reset output logic state when either V

CC1

or V

CC2

remains greater than 0.8V.

A variety of push-pull or open-drain reset outputs along

with watchdog input, manual-reset input, and power-fail

input/output features are available (see the Selector

Guide). Select reset timeout periods from 1.1ms to

1120ms (min) (see the

Reset Timeout Period Suffix

Guide).

The MAX6715A–MAX6729A/MAX6797A are

available in small 5-, 6-, and 8-pin SOT23 packages and

operate over the -40°C to +125°C temperature range.

● Multivoltage Systems

● Telecom/Networking

Equipment

● Computers/Servers

● Portable/Battery-

Operated Equipment

● V

CC1

(Primary Supply) Reset Threshold Voltages

from 1.58V to 4.63V

● V

CC2

(Secondary Supply) Reset Threshold Voltages

from 0.79V to 3.08V

● Externally Adjustable RSTIN Threshold for Auxiliary/

Triple-Voltage Monitoring (0.62V Internal Reference)

● Watchdog Timer Option

• 35s (min) Long Startup Period

• 1.12s (min) Normal Timeout Period

● Manual-Reset Input Option

● Power-Fail Input/Power-Fail Output Option

(Push-Pull and Open-Drain Active-Low)

● Guaranteed Reset Valid Down to V

CC1

CC2

= 0.8V

● Reset Output Logic Options

● Immune to Short V

Transients

● Low Supply Current 14μA (typ) at 3.6V

● Watchdog Disable Feature

● Small 5, 6, and 8-Pin SOT23 Packages

● AEC-Q100 Qualified: MAX6719AUTTWD1/V+T

Ordering Information

continued at end of data sheet.

Pin Description

and

Selector Guide

appear at end of data

sheet.

Features

Applications

● Industrial Equipment

● Printers/Fax Machines

● Set-Top Boxes

Typical Operating Circuit

UNREGULATED

DC-DC OUT2

IN CONVERTER

OUT1

CC1

CC2

1.8V

0.9V

MAX6715A-

MAX6729A/

MAX6797A

RST

RSTIN/PFI

WDI

PFO

MAX67_ _

PUSHBUTTON

SWITCH

I/O

CORE

SUPPLY SUPPLY

RESET

I/O

NMI

µP

19-0536; Rev 6; 7/19

MAX6715A–MAX6729A/

MAX6797A

Absolute Maximum Ratings

Terminal Voltage (with respect to GND)

CC1

, V

CC2

.........................................................-0.3V to +6V

Open-Drain

RST, RST1, RST2, PFO,

RST ............-0.3V to +6V

Push-Pull RST,

RST1, PFO, RST

.......... -0.3V to (V

CC1

+ 0.3V)

Push-Pull

RST2

...................................... -0.3V to (V

CC2

+ 0.3V)

RSTIN, PFI,

MR,

WDI .............................................-0.3V to +6V

Input Current/Output Current (all pins) ...............................20mA

Dual/Triple, Ultra-Low-Voltage, SOT23 μP

Supervisory Circuits

Continuous Power Dissipation (T

= +70°C)

5-Pin SOT23-5 (derate 3.9mW/°C above +70°C) ....312.6mW

6-Pin SOT23-6 (derate 8.7mW/°C above +70°C) .......696mW

8-Pin SOT23-8 (derate 5.6mW/°C above +70°C) ....444.4mW

Operating Temperature Range ......................... -40°C to +125°C

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

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

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

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.

Package Information

5 SOT23

PACKAGE CODE

Outline Number

Land Pattern Number

Thermal Resistance, Four-Layer Board:

Junction to Ambient (θ

)

Junction to Case (θ

)

Thermal Resistance, Multilayer Board:

Junction to Ambient (θ

)

Junction to Case (θ

)

255.9°C/W

81°C/W

U6+1/U6+1A

21-0058

90-0175

N/A

80°C/W

115°C/W

80°C/W

K8SN+1

21-0078

90-0176

N/A

80°C/W

180°C/W

60°C/W

324.3°C/W

82°C/W

21-0057

90-0174

U5+1

6 SOT23

PACKAGE CODE

Outline Number

Land Pattern Number

Thermal Resistance, Four-Layer Board:

Junction to Ambient (θ

)

Junction to Case (θ

)

Thermal Resistance, Multilayer Board:

Junction to Ambient (θ

)

Junction to Case (θ

)

8 SOT23

PACKAGE CODE

Outline Number

Land Pattern Number

Thermal Resistance, Four-Layer Board:

Junction to Ambient (θ

)

Junction to Case (θ

)

Thermal Resistance, Multilayer Board:

Junction to Ambient (θ

)

Junction to Case (θ

)

For the latest package outline information and land patterns (footprints), go to

www.maximintegrated.com/packages.

Note that a “+”, “#”, or “-” in the package

code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.

Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on

package thermal considerations, refer to

www.maximintegrated.com/thermal-tutorial.

www.maximintegrated.com

Maxim Integrated │

MAX6715A–MAX6729A/

MAX6797A

Electrical Characteristics

PARAMETER

Supply Voltage

Dual/Triple, Ultra-Low-Voltage, SOT23 μP

Supervisory Circuits

CC1

= 0.8V to 5.5V, V

CC2

= 0.8V to 5.5V, GND = 0V, T

= -40°C to +125°C, unless otherwise noted. Typical values are at

= +25°C.) (Note 1)

SYMBOL

CC1

Supply Current

CC2

CONDITIONS

CC1

< 5.5V all I/O connections open,

outputs not asserted

CC1

< 3.6V all I/O connections open,

outputs not asserted

CC2

< 3.6V all I/O connections open,

outputs not asserted

CC2

< 2.75V all I/O connections open,

outputs not asserted

L (falling)

M (falling)

T (falling)

S (falling)

CC1

Reset Threshold

TH1

R (falling)

Z (falling)

Y (falling)

W (falling)

V (falling)

T (falling)

S (falling)

R (falling)

Z (falling)

Y (falling)

W (falling)

CC2

Reset Threshold

TH2

V (falling)

I (falling)

H (falling)

G (falling)

F (falling)

E (falling)

D (falling)

4.500

4.250

3.000

2.850

2.550

2.250

2.125

1.620

1.530

3.000

2.850

2.550

2.250

2.125

1.620

1.530

1.350

1.275

1.080

1.020

0.810

0.765

MIN

0.8

4.625

4.375

3.075

2.925

2.625

2.313

2.188

1.665

1.575

3.075

2.925

2.625

2.313

2.188

1.665

1.575

1.388

1.313

1.110

1.050

0.833

0.788

TYP

MAX

5.5

4.750

4.500

3.150

3.000

2.700

2.375

2.250

1.710

1.620

3.150

3.000

2.700

2.375

2.250

1.710

1.620

1.425

1.350

1.140

1.080

0.855

0.810

UNITS

µA

www.maximintegrated.com

Maxim Integrated │ 3

MAX6715A–MAX6729A/

MAX6797A

Electrical Characteristics (continued)

PARAMETER

Reset Threshold Tempco

Reset Threshold Hysteresis

to Reset Output Delay

SYMBOL

ΔV

/°C

HYST

Dual/Triple, Ultra-Low-Voltage, SOT23 μP

Supervisory Circuits

CC1

= 0.8V to 5.5V, V

CC2

= 0.8V to 5.5V, GND = 0V, T

= -40°C to +125°C, unless otherwise noted. Typical values are at

= +25°C.) (Note 1)

CONDITIONS

Referenced to V

typical

MIN

TYP

0.5

1.1

8.8

17.5

140

280

560

1120

611

-100

RSTIND

PFI

PFH

DPF

0.7 x V

CC1

100

First watchdog period after reset timeout

period

Normal mode

(Note 2)

200

PFI

+ 30mV) to (V

PFI

- 30mV)

RSTIN

to (V

RSTIN

- 30mV)

611

-100

0.3 x V

CC1

626.5

642

+100

1.65

13.2

26.25

52.5

210

420

840

1680

626.5

2.2

17.6

280

560

1120

2240

642

+100

µs

CC1

= (V

TH1

+ 100mV) to (V

TH1

- 100mV) or

CC2

= (V

TH2

+ 75mV) to (V

TH2

- 75mV)

D7 (MAX6797A only)

Reset Timeout Period

D8 (MAX6797A only)

RSTIN Input Threshold

RSTIN Input Current

RSTIN Hysteresis

RSTIN to Reset Output Delay

PFI Input Threshold

PFI Input Current

PFI Hysteresis

PFI to

PFO

Delay

POWER-FAIL INPUT (MAX6728A/MAX6729A)

RSTIN

MAX

UNITS

ppm/°C

µs

ADJUSTABLE RESET COMPARATOR INPUT (MAX6719A/MAX6720A/MAX6723A–MAX6727A)

MANUAL-RESET INPUT (MAX6715A–MAX6722A/MAX6725A–MAX6729A)

Input Voltage

Minimum Pulse Width

Glitch Rejection

to Reset Delay

Pullup Resistance

WATCHDOG INPUT (MAX6721A–MAX6729A)

Watchdog Timeout Period

WDI Pulse Width

WDI Input Voltage

WDI Input Current

WDI

= 0V or V

CC1

1.12

0.3 x V

CC1

0.7 x V

CC1

-1

1.68

2.24

µA

µs

kΩ

www.maximintegrated.com

Maxim Integrated │

MAX6715A–MAX6729A/

MAX6797A

Electrical Characteristics (continued)

PARAMETER

RESET/POWER-FAIL OUTPUTS

SYMBOL

Dual/Triple, Ultra-Low-Voltage, SOT23 μP

Supervisory Circuits

CC1

= 0.8V to 5.5V, V

CC2

= 0.8V to 5.5V, GND = 0V, T

= -40°C to +125°C, unless otherwise noted. Typical values are at

= +25°C.) (Note 1)

CONDITIONS

CC1

or V

CC2

≥ 0.8V, I

SINK

= 1µA,

output asserted

CC1

or V

CC2

≥ 1.0V, I

SINK

= 50µA,

output asserted

CC1

or V

CC2

≥ 1.2V, I

SINK

= 100µA,

output asserted

CC1

or V

CC2

≥ 2.7V, I

SINK

= 1.2mA,

output asserted

CC1

or V

CC2

≥ 4.5V, I

SINK

= 3.2mA,

output asserted

RST/RST1/PFO

Output High

(Push-Pull Only)

CC1

≥ 1.8V, I

SOURCE

= 200µA, output not

asserted

CC1

≥ 2.7V, I

SOURCE

= 500µA, output not

asserted

CC1

≥ 4.5V, I

SOURCE

= 800µA, output not

asserted

CC1

≥ 1.8V, I

SOURCE

= 200µA, output not

asserted

CC1

≥ 2.7V, I

SOURCE

= 500µA, output not

asserted

CC1

≥ 4.5V, I

SOURCE

= 800µA, output not

asserted

CC1

≥ 1.0V, I

SOURCE

= 1µA, reset asserted

RST

Output High

(Push-Pull Only)

CC1

≥ 1.8V, I

SOURCE

= 150µA,

reset asserted

CC1

≥ 2.7V, I

SOURCE

= 500µA,

reset asserted

CC1

≥ 4.5V, I

SOURCE

= 800µA,

reset asserted

RST

Output Low

(Push-Pull or Open Drain)

CC1

or V

CC2

≥ 1.8V, I

SINK

= 500µA,

reset not asserted

CC1

or V

CC2

≥ 2.7V, I

SINK

= 1.2mA,

reset not asserted

CC1

or V

CC2

≥ 4.5V, I

SINK

= 3.2mA,

reset not asserted

Output not asserted

Output asserted

0.8 x V

CC1

0.8 x V

CC1

0.8 x V

CC1

0.8 x V

CC2

0.8 x V

CC2

0.8 x V

CC2

0.8 x V

CC1

0.8 x V

CC1

0.8 x V

CC1

0.8 x V

CC1

0.3

0.4

0.5

µA

MIN

TYP

MAX

UNITS

0.3

0.4

RST/RST1/RST2/PFO

Output Low

(Push-Pull or Open-Drain)

RST2

Output High

(Push-Pull Only)

RST/RST1/RST2/PFO

Output

Open-Drain Leakage Current

RST Output Open-Drain

Leakage Current

Note 1:

Devices tested at T

= +25°C. Overtemperature limits are guaranteed by design and not production tested.

Note 2:

Parameter guaranteed by design.

www.maximintegrated.com

Maxim Integrated │

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