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MAX6701SKA+T-MAX6701TKA+T-MAX6702LKA+T-MAX6703AZKA+T-MAX6703RKA+T-MAX6703SKA+T-MAX6703TKA+T-MAX6703YKA+T-MAX6704SKA+T-MAX6705ALKA+T-MAX6705ATKA+T-MAX6706ALKA+-MAX6706SKA+T-MAX6707TKA+T-MAX6708RKA+T
Low-Voltage, SOT23, µP Supervisors with Power-Fail In/Out, Manual Reset, and Watchdog Timer
●Computers●Controllers●Intelligent Instruments●Critical µP Power Monitoring●White Goods●Networking●Telecommunications
General DescriptionThe MAX6701–MAX6708 microprocessor (µP) supervisory
circuits reduce the complexity and components required
to monitor power-supply functions in µP systems. These
devices significantly improve system reliability and accu-
racy compared to separate ICs or discrete components.
The MAX6701−MAX6708 family provides four func-
tions: a reset output during power-up, power-down, and
brownout conditions; an independent watchdog output
that goes low if the watchdog input has not been toggled
within 1.6s; a 0.62V threshold detector for power-fail
warning; and an active-low manual reset input.
The MAX6701–MAX6708 family offers several pinout
options to accommodate a variety of multivoltage micro-
processor supervision applications.
The MAX6701(A)/MAX6702(A)/MAX6703(A) monitor
three supply voltages (one fixed threshold and two
adjustable) to drive a single reset output and include a
manual reset input and a watchdog timer with an inde-
pendent output. The MAX6704 monitors a single-supply
voltage to drive complementary reset outputs and
includes an independent adjustable power-fail-in/power-
fail-out comparator, a manual reset input, and a reset-
based watchdog timer. The MAX6705(A)/MAX6706(A)/
MAX6707(A) monitor a single-supply voltage to drive
a single reset output and include an independent
adjustable power-fail-in/power-fail-out comparator, a
manual reset input, and a watchdog timer with an inde-
pendent output. The MAX6708 is the same as the
MAX6704 but without the watchdog timer function.
See the Detailed Description for differences between
non-A and A versions.
Applications
Features●Small 8-Pin SOT23 Package●Precision Monitoring of +5.0V, +3.3V, +3.0V, +2.5V
Supply Voltages●140ms Reset Timeout Delay●Power-Fail Input with Independent Output; Monitor Inputs Down to 0.62V (MAX6704−MAX6708)●Dual Adjustable Reset Input for Triple-Voltage
Monitoring (MAX6701(A)/MAX6702(A)/MAX6703(A))●1.6s Watchdog Timeout Period (MAX6701(A)−MAX6707(A))●Independent Watchdog Output
(MAX6701(A)/MAX6702(A)/MAX6703(A)/
MAX6705(A)/MAX6706(A)/MAX6707(A))●Manual Reset Input●Four Reset Output Stage Options
Active Low Push-Pull (MAX6701(A), MAX6705(A))
Active Low Open Drain (MAX6703(A), MAX6707(A))
Active High Push-Pull (MAX6702(A), MAX6706(A))
Dual Active Low/High Push-Pull (MAX6704,
MAX6708)●Guaranteed Reset Valid to VCC = 1V●Immune to Short Falling VCC Transients●Low Cost, Few External Components
Pin Configurations continued at end of data sheet.
Ordering Information continued at end of data sheet.Insert the desired suffix letter (from the Threshold Suffix Guide
table) into the blank to complete the part number. All devices
must be ordered in increments of 2500 pieces. Sample stock is
typically held on standard versions only. Contact factory for
availability.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
PARTTEMP RANGEPIN-PACKAGE
MAX6701_KA-T-40°C to +125°C8 SOT23
MAX6701A_KA-T-40°C to +125°C8 SOT23
WDI
RST_IN2RST_IN1
( ) ARE FOR MAX6702(A) ONLY.
WDO
RESET (RESET)VCC
GND
SOT23TOP VIEW
MAX6701(A)
MAX6702(A)
MAX6703(A)
MAX6701-08/
MAX6701A-03A/
MAX6705A-07A
Low-Voltage, SOT23 µP Supervisors with Power-Fail
In/Out, Manual Reset, and Watchdog Timer
Pin Conigurations
Ordering Information
Typical Operating Circuit and Selector Guide appear at
end of data sheet.
VCC .......................................................................-0.3V to +6.0V
Open-Drain RESET, WDO, PFO ........................-0.3V to +6.0V
Push-Pull RESET, RESET, WDO, PFO ...-0.3V to (VCC + 0.3V)
MR, WDI, PFI, RST_IN1, RST_IN2 .........-0.3V to (VCC + 0.3V)
Input Current (VCC) ............................................................20mA
Output Current (O, WDO) ..................................................20mA
Continuous Power Dissipation (TA = +70°C)8-Pin SOT23 (derate 8.9mW/°C above +70°C) ..........714mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
(VCC = +4.25V to +5.5V for L/M versions, VCC = +2.55V to +3.6V for the T/S/R versions, VCC = +2.1V to +2.75V for the Z/Y versions.
TA = -40°C to +125°C, unless otherwise specified. Typical values are at TA = +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSOperating Voltage RangeVCCTA = 0°C to +125°C1.05.5VTA = -40°C to +125°C1.25.5
Supply Current
MR UnconnectedICC
VCC < 5.5V, no load1225VCC < 3.6V, no load920
VCC < 3.6V, no load (MAX6708 only)620
VCC Reset Threshold
(VCC falling)VTH
MAX670_L/MAX670_ALTA = -40°C to +85°C4.504.634.75
TA = -40°C to +125°C4.474.78
MAX670_M/MAX670_AMTA = -40°C to +85°C4.254.384.50
TA = -40°C to +125°C4.224.53
MAX670_T/MAX670_ATTA = -40°C to +85°C3.003.083.15
TA = -40°C to +125°C2.973.17
MAX670_S/MAX670_AS
TA = -40°C to +85°C2.852.933.00
TA = -40°C to +125°C2.833.02
MAX670_R/MAX670_ARTA = -40°C to +85°C2.552.632.70
TA = -40°C to +125°C2.532.72
MAX670_Z/MAX670_AZTA = -40°C to +85°C2.252.322.38
TA = -40°C to +125°C2.242.40
MAX670_Y/MAX670_AYTA = -40°C to +85°C2.122.192.25
TA = -40°C to +125°C2.112.27
Reset Threshold
Temperature Coefficient∆VTH60ppm/°C
VCC to Reset Output DelayVCC falling at 10mV/µs12µs
Reset Timeout PeriodtRPTA = -40°C to +85°C140200280msTA = -40°C to +125°C120300
VCC Falling to WDO DelayMAX6701(A)/MAX6702(A)/MAX6703(A)/MAX6705(A)/
MAX6706(A)/MAX6707(A)5µs
PFI, RST_IN1, RST_IN2
ThresholdVCC = 1.8V to 5.5VTA = -40°C to +85°C602618634mVTA = -40°C to +125°C593642
MAX6701-08/
MAX6701A-03A/
MAX6705A-07A
Low-Voltage, SOT23 µP Supervisors with Power-Fail
In/Out, Manual Reset, and Watchdog Timer
Electrical CharacteristicsStresses 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: Over-temperature limits are guaranteed by design and not production tested. Devices are tested at TA = +25°C.
(VCC = +4.25V to +5.5V for L/M versions, VCC = +2.55V to +3.6V for the T/S/R versions, VCC = +2.1V to +2.75V for the Z/Y versions.
TA = -40°C to +125°C, unless otherwise specified. Typical values are at TA = +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSPFI, RST_IN1, RST_IN2
Leakage Current(Note 2)TA = -40°C to +85°C-50+50nA
TA = -40°C to +125°C-200+200
PFI to PFO DelaytPF1µs
MR Input Voltage
VIL0.3 x VCCVIH0.7 x VCC
MR Minimum Input Pulse1µs
MR Glitch Rejection100ns
MR to Reset DelaytMD200ns
VCC Rising to WDO DelayMAX6701(A)/MAX6702(A)/MAX6703(A)/
MAX6705(A)/MAX6706(A)/MAX6707(A)100ns
MR Pullup Resistance255075kΩ
Watchdog Timeout PeriodtWDTA = -40°C to +85°C1.121.62.4sTA = -40°C to +125°C0.962.52
WDI Pulse WidthtWDI(Note 2)50ns
WDI Input VoltageVIL0.3 x VCCVVIH0.7 x VCC
WDI Input CurrentIWDIVWDI = 0V or VCC-1+1µA
RESET, WDO Output Low
(Push-Pull or Open Drain)VOL
VCC ≥ 1.0V, ISINK = 50µA, output asserted
(TA = 0°C to +125°C)0.3VCC ≥ 1.2V, ISINK = 100µA, output asserted0.3
VCC ≥ 2.55V, ISINK = 1.2mA, output asserted0.3
VCC ≥ 4.25V, ISINK = 3.2mA, output asserted0.4
PFO Output Low
(Push-Pull or Open Drain)VOL
VCC ≥ 1.80V, ISINK = 200µA, output asserted0.3VCC ≥ 2.55V, ISINK = 1.2mA, output asserted0.3
VCC ≥ 4.25V, ISINK = 3.2mA, output asserted0.4
RESET, WDO, PFO Output
High (Push-Pull Only)VOHVCC ≥ 2.7V, ISOURCE = 500µA, output not asserted0.8 x VCCVVCC ≥ 4.75V, ISOURCE = 800µA, output not asserted0.8 x VCC
RESET, WDO, PFO
Output Open-Drain
Leakage Current
ILKGVCC > VTH, output not asserted1.0µA
RESET Output High
(Push-Pull Only)VOH
VCC ≥ 1.0V, ISOURCE = 1µA, reset asserted
(TA = 0°C to +125°C)0.8 x VCCVCC ≥ 1.2V, ISOURCE = 50µA, reset asserted0.8 x VCC
VCC ≥ 2.55V, ISOURCE = 500µA, reset asserted0.8 x VCC
VCC ≥ 4.25V, ISOURCE = 800µA, reset asserted0.8 x VCC
RESET Output Low
(Push-Pull Only)VOLVCC ≥ 2.7V, ISINK = 1.2mA, reset not asserted0.3VVCC ≥ 4.75V, ISINK = 3.2mA, reset not asserted0.4
MAX6701-08/
MAX6701A-03A/
MAX6705A-07A
Low-Voltage, SOT23 µP Supervisors with Power-Fail
In/Out, Manual Reset, and Watchdog Timer
Electrical Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
VCC - VOH
vs. SOURCE CURRENT
MAX6701 toc08
CC
- V
(mV)
VCC 4.25V
OUTPUT-VOLTAGE LOW
vs. SINK CURRENT
MAX6701 toc07
(mV)
VCC 4.25V4080120160
MAXIMUM VCC TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVEMAX6701 toc06
RESET THRESHOLD OVERDRIVE (mV)
MAXIMUM TRANSIENT DURATION (
MAX670_Y
RESET OCCURS
ABOVE LINE
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE
MAX6701 toc05
TEMPERATURE (°C)
NORMALIZED RESET THRESOLD
WATCHDOG TIMEOUT PERIOD
vs. TEMPERATURE
MAX6701 toc04
TEMPERATURE (°C)
WATCHDOG TIMEOUT PERIOD (s)
VCC TO RESET OUTPUT DELAY
vs. TEMPERATURE
MAX6701 toc03
TEMPERATURE (°C)
TO RESET OUTPUT DELAY (s)
RESET TIMEOUT PERIOD
vs. TEMPERATURE
MAX6701 toc02
TEMPERATURE (°C)
RESET TIMEOUT PERIOD (ms)
SUPPLY CURRENT
vs. TEMPERATURE
MAX6701 toc01
TEMPERATURE (°C)
SUPPLY CURRENT (
VCC = 5V
VCC = 3.3V
MAX6705(A)
MAX6708
MAX6701-08/
MAX6701A-03A/
MAX6705A-07A
Low-Voltage, SOT23 µP Supervisors with Power-Fail
In/Out, Manual Reset, and Watchdog Timer
Typical Operating Characteristics
PIN
NAMEFUNCTIONMAX6701(A)
MAX6702(A)
MAX6703(A)
MAX6704
MAX6705(A)
MAX6706(A)
MAX6707(A)
MAX6708111MR
Active-Low, Manual Reset Input, Internal 50kΩ Pullup
to VCC. Pull low to force a reset. Reset remains active
as long as MR is low and the reset timeout period after
MR goes high. Leave unconnected or connect to VCC if
unused. WDO deasserts when MR is low (MAX6701(A)/
MAX6702(A)/MAX6703(A)/ MAX6705(A)/ MAX6706(A)/
MAX6707(A) only)222VCC
Supply Voltage for MAX6701–MAX6708 and Input for
Primary Reset Threshold Monitor. Push-pull outputs are
powered by VCC.333GNDGround444PFI
Power-Fail Voltage Monitor Input. High-impedance
input for internal power-fail comparator. Connect this
pin to an external resistive-divider network to set the
reset threshold voltage; 0.62V (typ) threshold. Connect
to GND or VCC when not used.555PFOPower-Fail Monitor Output. Open drain or push-pull
active low. PFO goes low when PFI is less than 0.62V.66—WDI
Watchdog Input. If WDI remains high or low for longer
than the watchdog timeout period, the internal watchdog
timer runs out and WDO is asserted. WDO is asserted
low after each watchdog overflow and remains low until
the watchdog timer is cleared (the reset output is not
affected). The internal watchdog timer clears whenever
a VCC/RST_IN1/RST_IN2 reset is asserted, the manual
reset is asserted, or WDI sees a rising or falling edge.
The watchdog timer remains cleared until the reset output
is deasserted. On the MAX6704, RESET pulse asserts
for the reset timeout period after each watchdog timeout
overflow. The watchdog timer cannot be disabled.——6N.C.No Connection. Not internally connected.777RESET
Active-Low Reset Output (Open Drain or Push-Pull).
RESET changes from high to low when the VCC input
drops below the selected reset threshold (or RST_IN1/
RST_IN2 for the MAX6701(A)/MAX6702(A)/MAX6703(A),
MR is pulled low, or the watchdog triggers a reset
(MAX6704 only). RESET remains low for the reset timeout
period after the reset conditions are terminated.
MAX6701-08/
MAX6701A-03A/
MAX6705A-07A
Low-Voltage, SOT23 µP Supervisors with Power-Fail
In/Out, Manual Reset, and Watchdog Timer
Pin Description
*RESET active-high for the MAX6702(A)/MAX6706(A).
Detailed DescriptionFigures 1, 2, and 3 are functional diagrams for the
MAX6705(A)/MAX6706(A)/MAX6707(A), MAX6704/
MAX6708, and MAX6701(A)/MAX6702(A)/MAX6703(A),
respectively.
Reset OutputA microprocessor’s (µP’s) reset input starts the µP in a
known state. The MAX6701–MAX6708 assert reset
during power-up and prevent code execution errors
during power-down or brownout conditions.
On power-up, once VCC reaches 1V, RESET is a
RESET stays low. After VCC, RST_IN1, or RST_IN2 rise
above the reset threshold, an internal timer holds RESET
low for about 200ms. RESET pulses low whenever
VCC dips below the reset threshold, including brownout
conditions. If a brownout occurs in the middle of a
previously initiated reset pulse, the pulse continues for
at least another 140ms. On power-down, once VCC
falls below the reset threshold, RESET stays low and is
guaranteed to be 0.4V or less, until VCC drops below 1V.
The MAX6702(A)/MAX6704/MAX6706(A)/MAX6708
active-high RESET output is the complement of the
RESET output, and is guaranteed to be valid with VCC
PIN
NAMEFUNCTIONMAX6701(A)
MAX6702(A)
MAX6703(A)
MAX6704
MAX6705(A)
MAX6706(A)
MAX6707(A)
MAX6708—8—WDO
Active-Low Watchdog Output (Open Drain or Push-
Pull). WDO is asserted whenever the watchdog
times out and VCC or the reset inputs are below their
respective thresholds. WDO deasserts after a valid
WDI transition without a reset timeout period. In the A
versions, WDO deasserts without a timeout delay when
VCC, RST_IN1, and RST_IN2 rises above its threshold.
Pull MR low to assert WDO (MAX6701/MAX6702/
MAX6703/MAX6705/MAX6706/MAX6707 only). Pull
MR low to deassert WDO (MAX6701(A)/MAX6702(A) /
MAX6703(A)/ MAX6705(A)/MAX6706(A)MAX6707(A)
only)87*8RESET
Active-High Reset Output (Push-Pull). RESET changes
from low to high when the VCC input drops below the
selected reset threshold (or RST_IN1/RST_IN2 for
MAX6701(A)/MAX6702(A)/ MAX6703(A), MR is pulled
low, or the watchdog triggers a reset (MAX6704 only).
RESET remains high for the reset timeout period after
the reset conditions are terminated. ———RST_IN1
Input for User-Adjustable VCC2 Monitor. High-
impedance input for second internal reset comparator.
Connect this pin to an external resistive-divider network
to set the reset threshold voltage; 0.62V (typ) threshold.
Connect to VCC when not used. Reset is asserted
when either VCC, RST_IN1, or RST_IN2 are below
threshold.———RST_IN2
Input for User-Adjustable VCC3 Monitor. High-
impedance input for third internal reset comparator.
Connect this pin to an external resistive-divider network
to set the reset threshold voltage; 0.62V (typ) threshold.
Connect to VCC when not used. Reset is asserted
when either VCC, RST_IN1, or RST_IN2 are below
threshold.
MAX6701-08/
MAX6701A-03A/
MAX6705A-07A
Low-Voltage, SOT23 µP Supervisors with Power-Fail
In/Out, Manual Reset, and Watchdog Timer
Pin Description (continued)
