●Computers
●Controllers
●Intelligent Instruments
●Critical µP and µC
Power Monitoring
●Portable/Battery-
Powered Equipment
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 exter-
nal 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 VCC
supply voltage declines below a preset threshold or
whenever manual reset is asserted. Reset remains
asserted for at least 140ms after VCC has 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 out-
put. The reset comparator is designed to ignore fast
transients on VCC, and the outputs are guaranteed to
be in the correct logic state for VCC down 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
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
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.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
PART TEMP RANGE PIN-PACKAGE
MAX6711_EXS-T -40°C to +125°C 4 SC70
MAX6711_EXS-T10 -40°C to +125°C 4 SC70
MAX6712_EXS-T -40°C to +125°C 4 SC70
MAX6712_EXS-T10 -40°C to +125°C 4 SC70
MAX6713_EXS-T -40°C to +125°C 4 SC70
MAX6713_EXS-T10 -40°C to +125°C 4 SC70
TOP VIEW
RESET (RESET)
1
GND VCC
MAX6711
MAX6712
MAX6713
SC70-4
2
4
MR
3
( ) ARE FOR MAX6712.
MAX6711
MAX6713
VCC
VCC
RPULL-UP*
RESET RESET
INPUT
GND
MR
VCC
GND
*MAX6713 ONLY
PUSHBUTTON
SWITCH
µP
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
19-1623; Rev 2; 5/14
Pin CongurationTypical Operating Circuit
Selector Guide appears at end of data sheet.
Ordering Information
Terminal Voltage (with respect to GND)
VCC .......................................................................-0.3V to +6.0V
RESET, RESET (push-pull) ...................... -0.3V to (VCC + 0.3V)
RESET (open drain) .............................................-0.3V to +6.0V
MR ............................................................ -0.3V to (VCC + 0.3V)
Input Current, VCC, MR ......................................................20mA
Output Current, RESET, RESET ........................................ 20mA
Rate of Rise, VCC ..........................................................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
(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, VCC = +3V for R version, VCC = +2.5V for Z version, and TA = +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
VCC Range TA = 0°C to +70°C 1.0 5.5 V
TA = -40°C to +105°C 1.2 5.5
Supply Current ICC
TA = -40°C to
+85°C
VCC < 5.5V, MAX671_L/M 16 35
µA
VCC < 3.6V, MAX671_R/S/T/Z 12 30
TA = +85°C to
+105°C
VCC < 5.5V, MAX671_L/M 75
VCC < 3.6V, MAX671_R/S/T/Z 75
Reset Threshold VTH
MAX671_L
TA = +25°C 4.56 4.63 4.70
V
TA = -40°C to +85°C 4.50 4.75
TA = +85°C to +105°C 4.40 4.86
MAX671_M
TA = +25°C 4.31 4.38 4.45
TA = -40°C to +85°C 4.25 4.50
TA = +85°C to +105°C 4.16 4.56
MAX671_T
TA = +25°C 3.04 3.08 3.11
TA = -40°C to +85°C 3.00 3.15
TA = +85°C to +105°C 2.92 3.23
MAX671_S
TA = +25°C 2.89 2.93 2.96
TA = -40°C to +85°C 2.85 3.00
TA = +85°C to +105°C 2.78 3.08
MAX671_R
TA = +25°C
TA = -40°C to +85°C
TA = +85°C to +105°C
2.59 2.63 2.66
2.55 2.70
2.50 2.76
MAX671_Z
TA = +25°C 2.28 2.32 2.35
TA = -40°C to +85°C 2.25 2.38
TA = +85°C to +105°C 2.21 2.45
Reset-Threshold Tempco 30 ppm/°C
VCC to Reset Delay (Note 2) VCC = VTH to (VTH - 100 mV) 20 µs
Reset Active Timeout Period TA = -40°C to +85°C 140 240 460 ms
TA = +85°C to +125°C 100 840
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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
Electrical Characteristics
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.
Absolute Maximum Ratings
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.
(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, VCC = +3V for R version, VCC = +2.5V for Z version, and TA = +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
RESET Output-Voltage Low
(MAX6711/MAX6713) VOL
VCC = VTH min, ISINK = 1.2mA,
MAX6711R/S/T/Z, MAX6713R/S/T/Z 0.3
V
VCC = VTH min, ISINK = 3.2mA,
MAX6711L/M, MAX6713L/M 0.4
VCC > 1.0V, ISINK = 50µA 0.3
RESET Output-Voltage High
(MAX6711) VOH
VCC > VTH max, ISOURCE = 500µA,
MAX6711R/S/T/Z 0.8 x VCC
V
VCC > VTH max, ISOURCE = 800µA,
MAX6711L/M VCC x 1.5
RESET Output-Voltage Low
(MAX6712)
VOL VCC = VTH max, ISINK = 1.2mA,
MAX6712R/S/T/Z 0.3
V
VCC = VTH max, ISINK = 3.2mA, MAX6712L/M 0.4
RESET Output-Voltage High
(MAX6712) VOH 1.8V < VCC < VTH min, ISOURCE = 150µA 0.8 x VCC V
RESET Open-Drain Output-
Leakage Current VCC > VTH, RESET deasserted 1 µA
MR Input Threshold VIL 0.3 x VCC V
VIH 0.7 x VCC
MR Pull-Up Resistance 10 20 kW
MR Minimum Pulse Width 1 µs
MR Glitch Immunity 100 ns
MR to Reset Delay 200 ns
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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
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, VCC = +3V for R version, VCC = +2.5V for Z version, and TA = +25°C.)
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
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
MAX671_L/M
POWER-DOWN RESET DELAY vs. TEMPERATURE
120
150
180
MAX6711/12/13-TOC3
TEMPERATURE (°C)
POWER-DOWN RESET DELAY (
µ
s)
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
VOD = 200mV
VOD = 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
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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
Typical Operating Characteristics
least 140ms after VCC has risen above the reset thresh-
old. 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 capabili-
ty, 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 20kW pullup 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/col-
lector outputs. To create a manual reset function, con-
nect 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 VCC Transients
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-dura-
tion negative-going VCC transients (glitches).
Figure 1 shows typical transient duration vs. reset com-
parator 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 end-
ing below it by the magnitude indicated (reset compar-
ator overdrive). The graph indicates the maximum pulse
width a negative-going VCC transient can have without
causing a reset pulse. As the magnitude of the transient
increases (goes farther below the reset threshold), the
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 power-
up, power-down, or brownout conditions. They assert a
reset signal whenever the VCC supply voltage declines
below a preset threshold, keeping it asserted for at
Figure 2. RESET Valid to VCC = Ground Circuit
Figure 1. Maximum Transient Duration Without Causing a
Reset Pulse vs. Reset Comparator Overdrive
PIN NAME FUNCTION
1GND Ground
2
RESET
(MAX6711/
MAX6713)
RESET output remains low while
V
CC
is below the reset threshold, and
for at
least 140ms after V
CC
rises
above the
reset threshold.
RESET
(MAX6712)
RESET output remains high while
V
CC
is below the reset threshold, and
for at
least 140ms after VCC rises
above the
reset threshold.
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 20kW(typ) pull-up resistor.
It can be driven from a TTL- or
CMOS-
logic line, or shorted to ground
with a
switch. Leave open or connect
to VCC
if unused.
4V
CC
Supply Voltage (+5.0V, +3.3V, +3.0V,
or +2.5V)
R1
100k
VCC
GND
MR
MAX6711
RESET
400
320
0
1 100 1000
160
80
240
RESET COMPARATOR OVERDRIVE, VTH - VCC (mV)
MAXIMUM TRANSIENT DURATION (µs)
10
TA = +25C
MAX671_L/M
MAX671_R/S/T/Z
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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
Pin Description
maximum allowable pulse width decreases. Typically,
for the MAX671_L and MAX671_M, a VCC transient that
goes 100mV below the reset threshold and lasts 20µs or
less will not cause a reset pulse. A 0.1µF bypass capaci-
tor mounted as close as possible to the VCC pin provides
additional transient immunity.
Ensuring a Valid Reset Output
Down to VCC = 0
When VCC falls below 1V, the MAX6711 RESET output
no longer sinks current—it becomes an open circuit.
Therefore, high-impedance CMOS-logic inputs connect-
ed to RESET can drift to undetermined voltages. This
presents no problem in most applications since most
µP and other circuitry is inoperative with VCC below 1V.
However, in applications where RESET must be valid
down to 0, adding a pull-down resistor to RESET caus-
es any stray leakage currents to flow to ground, holding
RESET low (Figure 2). R1's value is not critical; 100kW is
large enough not to load RESET and small enough to pull
RESET to ground.
A 100kW pull-up resistor to VCC is also recommended
for the MAX6712 if RESET is required to remain valid for
VCC < 1V.66
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 VCC pin. However, some systems may use the
open-drain output to level-shift from the monitored sup-
ply to reset circuitry powered by some other supply
(Figure 4). Note that as the MAX6713's VCC decreases
below 1V, so does the IC's ability to sink current at
RESET. Also, with any pullup, RESET will be pulled high
as VCC decays toward 0. The voltage where this occurs
depends on the pull-up resistor value and the voltage
to which it is connected.
Benets 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.
Figure 4. MAX6713 Open-Drain RESET Output Allows Use
with Multiple Supplies
Figure 3. Interfacing to μPs with Bidirectional Reset I/O
RESET
GND
RESET
INPUT
RPULLUP
MAX6713 5V SYSTEM
GND
VCC
+3.3V +5.0V
VCC
RESET
GND
MR
RESET
INPUT
MAX6713
MOTOROLA
68HCXX
µP
GND
VCC
VCC
VCC
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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
Chip Information
TRANSISTOR COUNT: 380
PART/SUFFIX RESET THRESHOLD (V) OUTPUT TYPE TOP MARK
MAX6711L
4.63
Push-Pull RESET
AAB
MAX6711M 4.38 Push-Pull RESET AAC
MAX6711T 3.08 Push-Pull RESET AAD
MAX6711S 2.93 Push-Pull RESET AAE
MAX6711R 2.63 Push-Pull RESET AAF
MAX6711Z 2.32
Push-Pull RESET
AAG
MAX6712L 4.63 Push-Pull RESET AAH
MAX6712M 4.38 Push-Pull RESET AAI
MAX6712T 3.08 Push-Pull RESET AAJ
MAX6712S 2.93 Push-Pull RESET AAK
MAX6712R 2.63 Push-Pull RESET AAL
MAX6712Z 2.32 Push-Pull RESET AAM
MAX6713L
4.63
Open-Drain RESET
AAN
MAX6713M 4.38
Open-Drain RESET
AAO
MAX6713T 3.08
Open-Drain RESET
AAP
MAX6713S 2.93
Open-Drain RESET
AAQ
MAX6713R 2.63
Open-Drain RESET
AAR
MAX6713Z 2.32
Open-Drain RESET
AAS
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
4 SC70 X4-1 21-0098 90-0187
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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
Selector Guide
Package Information
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.
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
2 5/14 No /V OPNs; removed automotive reference from Applications section 1
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2014 Maxim Integrated Products, Inc.
│
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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
Revision History
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
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