19-1952; Rev 1; 1/03
Low-Voltage, SOT23 碌P Supervisors with Power-
Fail In/Out, Manual Reset, and Watchdog Timer
General Description
The MAX6701鈥揗AX6708 microprocessor (碌P) supervisory
circuits reduce the complexity and components required
to monitor power-supply functions in 碌P systems. These
devices significantly improve system reliability and accu-
racy compared to separate ICs or discrete components.
The MAX6701鈥揗AX6708 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鈥揗AX6708 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.
Features
o
Small 8-Pin SOT23 Package
o
Precision Monitoring of +5.0V, +3.3V, +3.0V, +2.5V
Supply Voltages
o
140ms Reset Timeout Delay
o
Power-Fail Input with Independent Output;
Monitor Inputs Down to 0.62V (MAX6704鈥揗AX6708)
o
Dual Adjustable Reset Input for Triple-Voltage
Monitoring (MAX6701(A)/MAX6702(A)/MAX6703(A))
o
1.6s Watchdog Timeout Period
(MAX6701(A)鈥揗AX6707(A))
o
Independent Watchdog Output
(MAX6701(A)/MAX6702(A)/MAX6703(A)/
MAX6705(A)/MAX6706(A)/MAX6707(A))
o
Manual Reset Input
o
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)
o
Guaranteed Reset Valid to V
CC
= 1V
o
Immune to Short Falling V
CC
Transients
o
Low Cost, Few External Components
MAX6701鈥?8/MAX6701A鈥?3A/05A鈥?7A
Ordering Information
PART
MAX6701_KA-T
MAX6701A_KA-T
TEMP RANGE
-40擄C to +125擄C
-40擄C to +125擄C
PIN-PACKAGE
8 SOT23-8
8 SOT23-8
Applications
Computers
Controllers
Intelligent Instruments
Automotive Systems
Critical 碌P Power Monitoring
White Goods
Networking
Telecommunications
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.
Pin Configurations
TOP VIEW
MR
1
V
CC
2
GND
3
8
7
WDO
RESET (RESET)
WDI
RST_IN2
MAX6701(A)
MAX6702(A)
MAX6703(A)
6
5
RST_IN1
4
Typical Operating Circuit and Selector Guide appear at end
of data sheet.
( ) ARE FOR MAX6702(A) ONLY.
SOT23
Pin Configurations continued at end of data sheet.
________________________________________________________________
Maxim Integrated Products
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For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
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