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MAX6701LKA-T |MAX6701LKATMAXIMN/a2500avai4.63 V, Low-voltage, SOT23 mP supervisor with power-fail in/out, manual reset and watchdog timer
MAX6701LKA-T |MAX6701LKATMAXN/a1277avai4.63 V, Low-voltage, SOT23 mP supervisor with power-fail in/out, manual reset and watchdog timer
MAX6701SKA-T |MAX6701SKATMAXIMN/a2453avai2.93 V, Low-voltage, SOT23 mP supervisor with power-fail in/out, manual reset and watchdog timer
MAX6703SKA-T |MAX6703SKATMAXIMN/a2500avai2.93 V, Low-voltage, SOT23 mP supervisor with power-fail in/out, manual reset and watchdog timer
MAX6703TKA-T |MAX6703TKATMAX ?N/a399avai3.08 V, Low-voltage, SOT23 mP supervisor with power-fail in/out, manual reset and watchdog timer
MAX6704MKA-T |MAX6704MKATMAXIMN/a2500avai4.38 V, Low-voltage, SOT23 mP supervisor with power-fail in/out, manual reset and watchdog timer
MAX6704SKA-T |MAX6704SKATMAXIM ?N/a2457avai2.93 V, Low-voltage, SOT23 mP supervisor with power-fail in/out, manual reset and watchdog timer
MAX6705SKA-T |MAX6705SKATMAXIMN/a4880avai2.93 V, Low-voltage, SOT23 mP supervisor with power-fail in/out, manual reset and watchdog timer
MAX6708SKA-T |MAX6708SKATMAXIMN/a818avai2.93 V, Low-voltage, SOT23 mP supervisor with power-fail in/out, manual reset and watchdog timer


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MAX6701LKA-T-MAX6701SKA-T-MAX6703SKA-T-MAX6703TKA-T-MAX6704MKA-T-MAX6704SKA-T-MAX6705SKA-T-MAX6708SKA-T
4.63 V, Low-voltage, SOT23 mP supervisor with power-fail in/out, manual reset and watchdog timer
General Description
The 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 functions:
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

Computers
Controllers
Intelligent Instruments
Automotive Systems
Critical µP Power Monitoring
White Goods
Networking
Telecommunications
Features
Small 8-Pin SOT23 PackagePrecision Monitoring of +5.0V, +3.3V, +3.0V, +2.5V
Supply Voltages
140ms Reset Timeout DelayPower-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 InputFour 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= 1VImmune to Short Falling VCCTransientsLow Cost, Few External Components
MAX6701–08/MAX6701A–03A/05A–07A
Low-Voltage, SOT23 µP Supervisors with Power-
Fail In/Out, Manual Reset, and Watchdog Timer
Pin Configurations
Ordering Information

19-1952; Rev 2; 8/03
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.
Ordering Information continued at end of data sheet.
Typical Operating Circuit and Selector Guide appear at end
of data sheet.
MAX6701–08/MAX6701A–03A/05A–07A
Low-Voltage, SOT23 µP Supervisors with Power-
Fail In/Out, Manual Reset, and Watchdog Timer
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(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.
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.
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 (RESET, RESET, PFO, 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
MAX6701–08/MAX6701A–03A/05A–07A
Low-Voltage, SOT23 µP Supervisors with Power-
Fail In/Out, Manual Reset, and Watchdog Timer
ELECTRICAL CHARACTERISTICS (continued)

(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.= -40°C to +125°C, unless otherwise specified. Typical values are at TA= +25°C.) (Note 1)
MAX6701–08/MAX6701A–03A/05A–07A
Low-Voltage, SOT23 µP Supervisors with Power-
Fail In/Out, Manual Reset, and Watchdog Timer
Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)
MAX6701–08/MAX6701A–03A/05A–07A
Low-Voltage, SOT23 µP Supervisors with Power-
Fail In/Out, Manual Reset, and Watchdog Timer
Detailed Description
Figures 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 Output

A microprocessor’s (µP’s) reset input starts the µP in a
known state. The MAX6701–MAX6708 assert reset dur-
ing power-up and prevent code execution errors during
power-down or brownout conditions.
On power-up, once VCCreaches 1V, RESETis a guar-
anteed logic low of 0.4V or less. As VCCrises, RESET
stays low. After VCC, RST_IN1, or RST_IN2 rise above
the reset threshold, an internal timer holds RESETlow
for about 200ms. RESETpulses low whenever VCCdips
below the reset threshold, including brownout condi-
tions. 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 VCCfalls below
the reset threshold, RESETstays low and is guaranteed
to be 0.4V or less, until VCCdrops below 1V.
The MAX6702(A)/MAX6704/MAX6706(A)/MAX6708
active-high RESET output is the complement of the
RESEToutput, and is guaranteed to be valid with VCC
down to 1V.
MAX6701–08/MAX6701A–03A/05A–07A
Low-Voltage, SOT23 µP Supervisors with Power-
Fail In/Out, Manual Reset, and Watchdog Timer
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