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
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 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 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 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
●●
●●
●●
●●
Computers
Controllers
Intelligent Instruments
Critical µP and µC
Power Monitoring
●● Portable/Battery Powered Equipment
Ordering Information
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
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.
Pin Configuration
VCC
TOP VIEW
VCC
VCC
MAX6711
MAX6713
RESET
PUSHBUTTON
MR
SWITCH
GND
19-1623; Rev 2; 5/14
●● 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
Selector Guide appears at end of data sheet.
Typical Operating Circuit
*MAX6713 ONLY
Features
RPULL-UP*
GND 1
µP
VCC
3
MR
MAX6711
MAX6712
MAX6713
RESET
INPUT
GND
4
RESET (RESET) 2
( ) ARE FOR MAX6712.
SC70-4
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
Absolute Maximum Ratings
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
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.
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, VCC = +3V for R version, VCC = +2.5V for Z version, and TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
VCC Range
Supply Current
ICC
CONDITIONS
MIN
TA = 0°C to +70°C
1.0
5.5
TA = -40°C to +105°C
1.2
5.5
VCC < 5.5V, MAX671_L/M
16
35
+85°C
VCC < 3.6V, MAX671_R/S/T/Z
12
30
TA = +85°C to
VCC < 5.5V, MAX671_L/M
+105°C
VCC < 3.6V, MAX671_R/S/T/Z
MAX671_M
MAX671_T
VTH
MAX671_S
MAX671_R
MAX671_Z
75
Reset Active Timeout Period
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UNITS
V
µA
75
TA = +25°C
4.56
TA = -40°C to +85°C
4.50
4.75
TA = +85°C to +105°C
4.40
4.86
TA = +25°C
4.31
TA = -40°C to +85°C
4.25
4.50
TA = +85°C to +105°C
4.16
4.56
TA = +25°C
3.04
TA = -40°C to +85°C
3.00
3.15
TA = +85°C to +105°C
2.92
3.23
TA = +25°C
2.89
TA = -40°C to +85°C
2.85
TA = +85°C to +105°C
2.78
TA = +25°C
2.59
TA = -40°C to +85°C
2.55
TA = +85°C to +105°C
2.50
TA = +25°C
2.28
TA = -40°C to +85°C
2.25
2.38
TA = +85°C to +105°C
2.21
2.45
Reset-Threshold Tempco
VCC to Reset Delay (Note 2)
MAX
TA = -40°C to
MAX671_L
Reset Threshold
TYP
4.63
4.38
3.08
2.93
4.70
4.45
3.11
2.96
3.00
3.08
2.63
2.66
2.70
2.76
2.32
2.35
30
VCC = VTH to (VTH - 100 mV)
ppm/°C
20
TA = -40°C to +85°C
140
TA = +85°C to +125°C
100
V
240
µs
460
840
ms
Maxim Integrated │ 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
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.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
VCC = VTH min, ISINK = 1.2mA,
RESET Output-Voltage Low
(MAX6711/MAX6713)
VOL
0.4
MAX6711L/M, MAX6713L/M
VCC > 1.0V, ISINK = 50µA
RESET Output-Voltage High
(MAX6711)
RESET Output-Voltage Low
(MAX6712)
RESET Output-Voltage High
(MAX6712)
VOH
VOL
MAX6711L/M
VCC = VTH max, ISINK = 1.2mA,
VOH
0.8 x VCC
V
VCC x 1.5
0.3
MAX6712R/S/T/Z
1.8V < VCC < VTH min, ISOURCE = 150µA
V
0.4
0.8 x VCC
1
0.3 x VCC
VIH
0.7 x VCC
MR Pull-Up Resistance
10
MR Minimum Pulse Width
1
MR Glitch Immunity
MR to Reset Delay
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.
www.maximintegrated.com
V
VCC > VTH, RESET deasserted
VIL
V
0.3
VCC = VTH max, ISINK = 3.2mA, MAX6712L/M
RESET Open-Drain OutputLeakage Current
MR Input Threshold
MAX6711R/S/T/Z
VCC > VTH max, ISOURCE = 800µA,
UNITS
0.3
MAX6711R/S/T/Z, MAX6713R/S/T/Z
VCC = VTH min, ISINK = 3.2mA,
VCC > VTH max, ISOURCE = 500µA,
MAX
20
µA
V
kW
µs
100
ns
200
ns
Maxim Integrated │ 3
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
(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.)
5
MAX671 _L/M/R/S/T/Z, VCC = 1V
0
20
40
60
80
40
20
VOD = 100mV
100 120
0
MAX6711/12/13-TOC4
POWER-UP RESET TIMEOUT (ms)
40
60
80
MAX671_ R/S/T/Z
250
225
60
VOD = 100mV
30
0
-40 -20
100 120
POWER-UP RESET TIMEOUT vs.
TEMPERATURE
275
200
20
VOD = 20mV
90
VOD = 200mV
0
TEMPERATURE (°C)
TEMPERATURE (°C)
300
120
VOD = 200mV
0
-40 -20
VOD = 10mV
150
1.001
20 40 60 80
TEMPERATURE (°C)
100 120
RESET THRESHOLD vs.
TEMPERATURE
MAX6711/12/13-TOC5
-40 -20
VOD = 20mV
RESET THRESHOLD (V)
0
60
POWER-DOWN RESET DELAY (µs)
MAX671 _Z, VCC = 2.5V
MAX671 _R/S/T, VCC = 3.3V
VOD = 10mV
MAX671_L/M
POWER-DOWN RESET DELAY vs. TEMPERATURE
180
MAX6711/12/13-TOC2
POWER-DOWN RESET DELAY (µs)
MAX671_L/M, VCC = 5V
10
80
MAX6711/12/13 toc01
SUPPLY CURRENT (µA)
15
MAX671_R/S/T/Z
POWER-DOWN RESET DELAY vs. TEMPERATURE
MAX6711/12/13-TOC3
SUPPLY CURRENT vs. TEMPERATURE
(NO LOAD)
VTH = 4.63V
1.000
0.999
MAX671_ L/M
-40 -20
0
20
40
60
80
TEMPERATURE (°C)
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100 120
0.998
-40 -20
0
20
40
60
80
100 120
TEMPERATURE (°C)
Maxim Integrated │ 4
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
PIN
NAME
1
GND
FUNCTION
VCC
Ground
RESET output remains low while
VCC is below the reset threshold, and
for at least 140ms after V CC rises
above the reset threshold.
RESET
(MAX6711/
MAX6713)
MAX6711
RESET
MR
GND
2
RESET output remains high while
VCC is below the reset threshold, and
for at least 140ms after VCC rises
above the reset threshold.
RESET
(MAX6712)
3
4
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.
MR
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.
Supply Voltage (+5.0V, +3.3V, +3.0V,
or +2.5V)
VCC
MAXIMUM TRANSIENT DURATION (µs)
400
TA = +25C
320
240
160
MAX671_L/M
80
MAX671_R/S/T/Z
0
1
10
100
1000
RESET COMPARATOR OVERDRIVE, VTH - VCC (mV)
Figure 1. Maximum Transient Duration Without Causing a
Reset Pulse vs. Reset Comparator Overdrive
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 VCC supply voltage declines
below a preset threshold, keeping it asserted for at
www.maximintegrated.com
R1
100k
Figure 2. RESET Valid to VCC = Ground Circuit
least 140ms after VCC 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 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/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 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-duration negative-going VCC 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 VCC transient can have without
causing a reset pulse. As the magnitude of the transient
increases (goes farther below the reset threshold), the
Maxim Integrated │ 5
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
+5.0V
+3.3V
VCC
VCC
VCC
µP
MAX6713
RESET
MOTOROLA
RESET 68HCXX
INPUT
VCC
VCC
RPULLUP
MAX6713
RESET
5V SYSTEM
RESET
INPUT
MR
GND
GND
GND
GND
Figure 3. Interfacing to μPs with Bidirectional Reset I/O
Figure 4. MAX6713 Open-Drain RESET Output Allows Use
with Multiple Supplies
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 capacitor mounted as close as possible to the VCC pin provides
additional transient immunity.
MAX6713 Open-Drain RESET Output
Allows Use with Multiple Supplies
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 connected 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 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 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 opendrain, 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).
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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 supply 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.
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.
Chip Information
TRANSISTOR COUNT: 380
Maxim Integrated │ 6
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
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 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.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
4 SC70
X4-1
21-0098
90-0187
www.maximintegrated.com
Maxim Integrated │ 7
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
REVISION
NUMBER
REVISION
DATE
2
5/14
PAGES
CHANGED
DESCRIPTION
No /V OPNs; removed automotive reference from Applications section
1
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.
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 specifications 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.
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