MAX6701-08/
MAX6701A-03A/
MAX6705A-07A
Low-Voltage, SOT23 µP Supervisors 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 accuracy 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 microprocessor 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 independent output. The MAX6704 monitors a single-supply
voltage to drive complementary reset outputs and
includes an independent adjustable power-fail-in/powerfail-out comparator, a manual reset input, and a resetbased 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 independent 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
●● Critical µP Power
Monitoring
●● White Goods
●● Networking
●● Telecommunications
Typical Operating Circuit and Selector Guide appear at
end of data sheet.
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
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX6701_KA-T
-40°C to +125°C
8 SOT23
MAX6701A_KA-T
-40°C to +125°C
8 SOT23
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.
Ordering Information continued at end of data sheet.
Pin Configurations
TOP VIEW
1
8
VCC 2
7
RESET (RESET)
6
WDI
5
RST_IN2
MR
GND
3
MAX6701(A)
MAX6702(A)
MAX6703(A)
RST_IN1 4
( ) ARE FOR MAX6702(A) ONLY.
WDO
SOT23
Pin Configurations continued at end of data sheet.
19-1952; Rev 4; 5/14
