Maxim MAX6713MEXS-T10, MAX6713LEXS-T, MAX6713LEXS-T10, MAX6712TEXS-T, MAX6712TEXS-T10 Datasheet

General Description

The MAX6711/MAX6712/MAX6713 are microprocessor
(µP) supervisory circuits used to monitor the power
supplies in µP and digital systems. They provide excel­lent circuit reliability and low cost by eliminating exter­nal components and adjustments when used with
+5.0V, +3.3V, +3.0V, or +2.5V-powered circuits. They
also provide a debounced manual reset input.

These circuits assert a reset signal whenever the V

CC

supply voltage declines below a preset threshold or
whenever manual reset is asserted. Reset remains
asserted for at least 140ms after VCChas risen above
the reset threshold or when manual reset is deasserted.
Reset thresholds suitable for operation with a variety of
supply voltages are available.

The MAX6713 has an open-drain output stage, while
the MAX6711/MAX6712 have push-pull outputs. The
MAX6713’s open-drain RESET output requires a pull-up
resistor that can be connected to a voltage higher than
VCC. The MAX6711/MAX6713 have an active-low reset
output, while the MAX6712 has an active-high reset out­put. The reset comparator is designed to ignore fast
transients on VCC, and the outputs are guaranteed to
be in the correct logic state for VCCdown to 1V.

Low supply current makes the MAX6711/MAX6712/
MAX6713 ideal for use in portable equipment. These
devices are available in a 4-pin SC70 package.

Applications

Computers
Controllers
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable/Battery-Powered Equipment
Automotive

____________________________Features

♦ Precision Monitoring of 2.5V, 3.0V, 3.3V, and 5.0V

Power-Supply Voltages

♦ Fully Specified Over Temperature
♦ Available in Three Output Configurations

Push-Pull RESET Output (MAX6711)
Push-Pull RESET Output (MAX6712)
Open-Drain RESET Output (MAX6713)

♦ 140ms min Power-On Reset Pulse Width
♦ Manual Reset Input
♦ 12µA Supply Current
♦ Guaranteed Reset Valid to VCC= +1V
♦ Power-Supply Transient Immunity
♦ No External Components
♦ 4-Pin SC70 Package

MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z

4-Pin SC70 Microprocessor Reset Circuits

with Manual Reset Input

________________________________________________________________ Maxim Integrated Products 1

19-1623; Rev 0; 1/00

Note: These parts are offered in 2.5k or 10k reels and must be
ordered in 2.5k or 10k increments. Order MAX6711_EXS-T for

2.5k reels and MAX6711_EXS-T10 for 10k reels. Insert the
desired suffix letter from the Selector Guide into the blank to
complete the part number.

For free samples and the latest literature: www.maxim-ic.com, or phone [phone].
For small orders, phone [phone].

4 SC70-4-40°C to +125°C

MAX6711_EXS-T10

4 SC70-4

PIN-PACKAGETEMP. RANGE

-40°C to +125°C

MAX6711_EXS-T

PART

4 SC70-4-40°C to +125°C

MAX6712_EXS-T10

4 SC70-4-40°C to +125°C

MAX6712_EXS-T

4 SC70-4-40°C to +125°C

MAX6713_EXS-T10

4 SC70-4-40°C to +125°C

MAX6713_EXS-T

Ordering Information

TOP VIEW

RESET (RESET)

1

GND

V

CC

MAX6711
MAX6712
MAX6713

SC70-4

2

4

MR

3

( ) ARE FOR MAX6712.

MAX6711
MAX6713

V

CC

V

CC

R

PULL-UP

*

RESET

RESET
INPUT

GND

MR

V

CC

GND

*MAX6713 ONLY

PUSHBUTTON
SWITCH

µP

Pin ConfigurationTypical Operating Circuit

Selector Guide appears at end of data sheet.

MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z

4-Pin SC70 Microprocessor Reset Circuits
with Manual Reset Input

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= full range, TA= -40°C to +125°C, unless otherwise noted. Typical values are at VCC= +5V for L/M versions, VCC= +3.3V for
T/S versions, V

CC

= +3V for R version, VCC= +2.5V for Z version, and TA= +25°C.) (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.

Terminal Voltage (with respect to GND)

VCC........................................................................-0.3V to +6.0V

RESET, RESET (push-pull).........................-0.3V to (V

CC

+ 0.3V)

RESET (open drain)...............................................-0.3V to +6.0V

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

CC

+ 0.3V)

Input Current, V

CC

, MR.......................................................20mA

Output Current, RESET, RESET ..........................................20mA

Rate of Rise, V

CC

............................................................100V/µs

Continuous Power Dissipation (TA= +70°C)

4-Pin SC70 (derate 3.1mW/°C above +70°C)..............245mW

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

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

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

100 640

TA= +85°C to +125°C

TA= -40°C to +125°C

TA= 0°C to +70°C

TA= +85°C to
+125°C

TA= -40°C to
+85°C

MAX671_L

CONDITIONS

2.22 2.42

4.50 4.75

V

4.56 4.63 4.70

V

TH

Reset Threshold

1.2 5.5

V

1.0 5.5

VCCRange

60

60

12 30

16 35

I

CC

Supply Current

VCC< 5.5V, MAX671_L/M

VCC< 3.6V, MAX671_R/S/T/Z

UNITSMIN TYP MAXSYMBOLPARAMETER

VCC< 5.5V, MAX671_L/M

MAX671_R

2.59 2.63 2.66TA= +25°C

VCC< 3.6V, MAX671_R/S/T/Z

TA= +25°C

TA= -40°C to +85°C

MAX671_M

4.25 4.50

2.55 2.70TA= -40°C to +85°C

MAX671_Z

2.25 2.38

2.28 2.32 2.35

2.52 2.74TA= +85°C to +125°C

TA= +25°C

TA= -40°C to +85°C

4.31 4.38 4.45

4.44 4.82TA= +85°C to +125°C

TA= +25°C

TA= -40°C to +85°C

MAX671_T

3.04 3.08 3.11

4.20 4.56TA= +85°C to +125°C

TA= +25°C

3.00 3.15TA= -40°C to +85°C

2.95 3.21TA= +85°C to +125°C

MAX671_S

2.81 3.05

2.85 3.00

2.89 2.93 2.96TA= +25°C

TA= -40°C to +85°C

TA= +85°C to +125°C

TA= +85°C to +125°C

µA

Reset Threshold Tempco

ms

µs

ppm/°C

140 240 460

20

30

TA= -40°C to +85°C

VCC= VTHto (VTH- 100mV)

Reset Active Timeout Period

VCCto Reset Delay (Note 2)

MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z

4-Pin SC70 Microprocessor Reset Circuits

with Manual Reset Input

_______________________________________________________________________________________ 3

Note 1: Production testing done at TA= +25°C; limits over temperature guaranteed by design only.
Note 2: RESET output for MAX6711/MAX6713; RESET output for MAX6712.

CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER

VCC= VTHmax, I

SINK

= 3.2mA,

MAX6712L/M

VCC= VTHmax, I

SINK

= 1.2mA,

MAX6712R/S/T/Z

VCC> VTHmax, I

SOURCE

= 800µA,

MAX6711L/M

V

CC

> VTHmax, I

SOURCE

= 500µA,

MAX6711R/S/T/Z

VCC= VTHmin, I

SINK

= 1.2mA,

MAX6711R/S/T/Z, MAX6713R/S/T/Z

VCC= VTHmin, I

SINK

= 3.2mA,

MAX6711L/M, MAX6713L/M

VCC> VTH, RESET deasserted

VCC> 1.0V, I

SINK

= 50µA

1.8V < VCC< VTHmin, I

SOURCE

= 150µA

µA1

RESET Open-Drain Output
Leakage Current

V

0.8 · V

CC

V

OH

RESET Output Voltage High
(MAX6712)

0.4

V

0.3

V

OL

RESET Output Voltage Low
(MAX6712)

0.8 · V

CC

V

0.8 · V

CC

V

OH

RESET Output Voltage High
(MAX6711)

V

0.3

V

OL

RESET Output Voltage Low
(MAX6711/MAX6713)

0.4

0.3

V

0.3 · V

CC

V

IL

MR Input Threshold

V

IH

0.7 · V

CC

kΩ10 20

MR Pull-Up Resistance

1

MR Minimum Pulse Width

µs

ns100

MR Glitch Immunity

200

MR to Reset Delay

ns

ELECTRICAL CHARACTERISTICS (continued)

(VCC= full range, TA= -40°C to +125°C, unless otherwise noted. Typical values are at VCC= +5V for L/M versions, VCC= +3.3V for
T/S versions, V

CC

= +3V for R version, VCC= +2.5V for Z version, and TA= +25°C.) (Note 1)

MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z

4-Pin SC70 Microprocessor Reset Circuits
with Manual Reset Input

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VCC= full range, TA= -40°C to +125°C, unless otherwise noted. Typical values are at VCC= +5V for L/M versions, VCC= +3.3V for
T/S versions, V

CC

= +3V for R version, VCC= +2.5V for Z version, and TA= +25°C.)

200

POWER-UP RESET TIMEOUT vs.

TEMPERATURE

300

MAX6711/12/13-TOC4

TEMPERATURE (°C)

POWER-UP RESET TIMEOUT (ms)

250

225

275

-40 80 100 12020-20 0 6040

MAX671_ L/M

MAX671_ R/S/T/Z

0.998

RESET THRESHOLD vs. TEMPERATURE

1.001

MAX6711/12/13-TOC5

TEMPERATURE (°C)

RESET THRESHOLD (V)

1.000

0.999

-40 80 100 12020-20 0 6040

VTH = 4.63V

0

MAX671_L/M

POWER-DOWN RESET DELAY vs. TEMPERATURE

120

150

180

MAX6711/12/13-TOC3

TEMPERATURE (°C)

POWER-DOWN RESET DELAY (µs)

60

30

90

-40 80 100 12020-20 0 6040

VOD = 10mV

VOD = 20mV

VOD = 200mV

VOD = 100mV

0

MAX671_R/S/T/Z

POWER-DOWN RESET DELAY vs. TEMPERATURE

80

MAX6711/12/13-TOC2

TEMPERATURE (°C)

POWER-DOWN RESET DELAY (µs)

40

20

60

-40 80 100 12020-20 0 6040

VOD = 10mV

VOD = 20mV

V

OD

= 200mV

V

OD

= 100mV

-40 20 40-20 0 60 80 100 120

SUPPLY CURRENT vs. TEMPERATURE

(NO LOAD)

MAX6711/12/13 toc01

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

0

5

10

15

MAX671 _Z, VCC = 2.5V

MAX671_L/M, VCC = 5V

MAX671 _L/M/R/S/T/Z, VCC = 1V

MAX671 _R/S/T, VCC = 3.3V

MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z

_______________________________________________________________________________________ 5

Detailed Description

Reset Output

A microprocessor’s (µP’s) reset input starts the µP in a
known state. The MAX6711/MAX6712/MAX6713 assert
reset to prevent code-execution errors during power­up, power-down, or brownout conditions. They assert a
reset signal whenever the VCCsupply voltage declines
below a preset threshold, keeping it asserted for at

least 140ms after V

CC

has risen above the reset thresh­old. The MAX6713 uses an open-drain output, and the
MAX6711/MAX6712 have a push-pull output stage.
Connect a pull-up resistor on the MAX6713’s RESET
output to any supply between 0 and 6V.

Manual Reset Input

Many µP-based systems require manual reset capabili­ty, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. Reset remains asserted
while MR is low, and for at least 140ms after MR returns
high. This input has an internal 20kΩ pull-up resistor, so
it can be left open if it is not used. MR can be driven
with TTL- or CMOS-logic levels, or with open-drain/col­lector outputs. To create a manual reset function, con­nect a normally open momentary switch from MR to
ground; external debounce circuitry is not required. If
MR is driven from long cables or if the device is used in
a noisy environment, connecting a 0.1µF capacitor from
MR to ground provides additional noise immunity.

Applications Information

Negative-Going VCCTransients

In addition to issuing a reset to the µP during power-up,
power-down, and brownout conditions, the MAX6711/
MAX6712/MAX6713 are relatively immune to short-dura­tion negative-going V

CC

transients (glitches).

Figure 1 shows typical transient duration vs. reset com­parator overdrive, for which the MAX6711/MAX6712/
MAX6713 do not generate a reset pulse. The graph was
generated using a negative-going pulse applied to VCC,
starting 0.5V above the actual reset threshold and end­ing below it by the magnitude indicated (reset compara­tor overdrive). The graph indicates the maximum pulse
width a negative-going VCCtransient can have without
causing a reset pulse. As the magnitude of the transient
increases (goes farther below the reset threshold), the

4-Pin SC70 Microprocessor Reset Circuits

with Manual Reset Input

R1
100k

V

CC

GND

MR

MAX6711

RESET

Figure 2.

RESET

Valid to VCC= Ground Circuit

2

RESET

(MAX6711/
MAX6713)

RESET Output remains low while V

CC

is below the reset threshold, and for at
least 140ms after VCCrises above the
reset threshold.

1 GND Ground

PIN NAME FUNCTION

RESET

(MAX6712)

RESET Output remains high while V

CC

is below the reset threshold, and for at
least 140ms after VCCrises above the
reset threshold.

_____________________Pin Description

400

320

0

1 100 1000

160

80

240

RESET COMPARATOR OVERDRIVE, V

TH

- VCC (mV)

MAXIMUM TRANSIENT DURATION (µs)

10

TA = +25°C

MAX671_L/M

MAX671_R/S/T/Z

Figure 1. Maximum Transient Duration Without Causing a
Reset Pulse vs. Reset Comparator Overdrive

3

MR

Manual Reset Input. RESET (RESET)
remains asserted as long as MR is low,
and for at least 140ms after MR is
deasserted. This active-low input has
an internal 20kΩ (typ) pull-up resistor.
It can be driven from a TTL- or CMOS­logic line, or shorted to ground with a
switch. Leave open or connect to V

CC

if unused.

4 V

CC

Supply Voltage (+5.0V, +3.3V, +3.0V,
or +2.5V)

MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z

maximum allowable pulse width decreases. Typically, for
the MAX671_L and MAX671_M, a VCCtransient that
goes 100mV below the reset threshold and lasts 20µs or
less will not cause a reset pulse. A 0.1µF bypass capaci­tor mounted as close as possible to the VCCpin provides
additional transient immunity.

Ensuring a Valid Reset Output

Down to V

CC

= 0

When VCCfalls below 1V, the MAX6711 RESET output
no longer sinks current—it becomes an open circuit.
Therefore, high-impedance CMOS-logic inputs con­nected to RESET can drift to undetermined voltages.
This presents no problem in most applications since
most µP and other circuitry is inoperative with V

CC

below 1V. However, in applications where RESET must
be valid down to 0, adding a pull-down resistor to
RESET causes any stray leakage currents to flow to
ground, holding RESET low (Figure 2). R1’s value is not
critical; 100kΩ is large enough not to load RESET and
small enough to pull RESET to ground.

A 100kΩ pull-up resistor to VCCis also recommended
for the MAX6712 if RESET is required to remain valid for
VCC< 1V.

Interfacing to µPs with

Bidirectional Reset Pins

Since the RESET output on the MAX6713 is open-drain,
this device interfaces easily with µPs that have bidirec­tional reset pins, such as the Motorola 68HC11.
Connecting the µP supervisor’s RESET output directly
to the µP’s RESET pin with a single pull-up resistor
allows either device to assert reset (Figure 3).

MAX6713 Open-Drain

RESET

Output

Allows Use with Multiple Supplies

Generally, the pull-up connected to the MAX6713 will
connect to the supply voltage that is being monitored at
the IC’s VCCpin. However, some systems may use the
open-drain output to level-shift from the monitored sup­ply to reset circuitry powered by some other supply
(Figure 4). Note that as the MAX6713’s VCCdecreases
below 1V, so does the IC’s ability to sink current at
RESET. Also, with any pull-up, RESET will be pulled
high as VCCdecays toward 0. The voltage where this
occurs depends on the pull-up resistor value and the
voltage to which it is connected.

Benefits of Highly Accurate

Reset Threshold

Most µP supervisor ICs have reset threshold voltages
between 5% and 10% below the value of nominal sup­ply voltages. This ensures a reset will not occur within
5% of the nominal supply, but will occur when the sup­ply is 10% below nominal.

When using ICs rated at only the nominal supply ±5%,
a zone of uncertainty where the supply is between 5%
and 10% low, and where the reset may or may not be
asserted is left.

The MAX671_L/T/Z use highly accurate circuitry to
ensure that reset is asserted close to the 5% limit, and
long before the supply has declined to 10% below
nominal.

4-Pin SC70 Microprocessor Reset Circuits
with Manual Reset Input

6 _______________________________________________________________________________________

RESET

GND

RESET
INPUT

R

PULLUP

MAX6713

5V SYSTEM

GND

V

CC

+3.3V

+5.0V

V

CC

Figure 4. MAX6713 Open-Drain

RESET

Output Allows Use with

Multiple Supplies

RESET

GND

MR

RESET
INPUT

MAX6713

MOTOROLA

68HCXX

µP

GND

V

CC

V

CC

V

CC

Figure 3. Interfacing to µPs with Bidirectional Reset I/O

TRANSISTOR COUNT: 380

___________________Chip Information

MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z

4-Pin SC70 Microprocessor Reset Circuits

with Manual Reset Input

_______________________________________________________________________________________ 7

Selector Guide

AAS

Open-Drain RESET

2.32MAX6713Z

Open-Drain RESET
Open-Drain RESET

MAX6713S 2.93

MAX6713R 2.63

AAQ

AAR

Push-Pull RESET

Open-Drain RESET
Open-Drain RESET
Open-Drain RESET

MAX6712Z 2.32

MAX6713L

4.63

MAX6713M 4.38

MAX6713T 3.08

AAM

AAN

AAO

AAP

TOP MARK

AAH

AAG

AAF

AAE

AAI

AAJ

AAK

AAL

AAB

AAC

AAD

PART/SUFFIX RESET THRESHOLD (V) OUTPUT TYPE

Push-Pull RESET

MAX6712L

4.63

Push-Pull RESET

Push-Pull RESET

MAX6711Z 2.32

Push-Pull RESET

Push-Pull RESET

MAX6711R 2.63

Push-Pull RESET

Push-Pull RESET

MAX6711S 2.93

Push-Pull RESET

Push-Pull RESET

MAX6712M 4.38

Push-Pull RESET
Push-Pull RESET

MAX6712T 3.08

MAX6712S 2.93

MAX6712R 2.63

MAX6711M

MAX6711L

4.63

4.38

MAX6711T 3.08

MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z

4-Pin SC70 Microprocessor Reset Circuits
with Manual Reset Input

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.

8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

© 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

SC70, 4L.EPS

Package Information