19-2324; Rev 2; 12/05
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
The MAX6700/MAX6710 precision triple/quad voltage
microprocessor (µP) supervisory circuits monitor up to
four system-supply voltages and assert a single reset if
any supply voltage drops below its preset threshold.
These devices significantly reduce system size and component count while improving reliability compared to separate ICs or discrete components.
A variety of factory-trimmed threshold voltages are available to accommodate different supply voltages and tolerances with minimal external component requirements.
The MAX6710 includes internally fixed options for monitoring 5.0V, 3.3V, 3.0V, 2.5V, and 1.8V supplies with -5%
or -10% tolerances. The MAX6710 is also available with
one to three adjustable threshold options to monitor voltages down to 0.62V. The MAX6700 monitors three voltages with adjustable thresholds down to 0.62V.
A single active-low output asserts when any monitored
input falls below its associated threshold. The open-drain
output has a weak internal pullup (10µA) to IN2. For the
MAX6710, reset remains low for the reset timeout period
(140ms min) after all voltages rise above the selected
threshold. The MAX6700 acts as a voltage detector with a
propagation delay of 5µs after all monitored voltages
exceed their thresholds. The output remains valid as long
as either IN2 or IN2 input voltage remains above 1V
(MAX6710) or VCC is above 2V (MAX6700/MAX6710Q).
The MAX6700/MAX6710 are available in a small 6-pin
SOT23 package and operate over the extended (-40°C to
+85°C) temperature range.
________________________Applications
Features
♦ Monitor Up to Four Power-Supply Voltages
♦ Precision Factory-Set Reset Threshold Options
for 5.0V, 3.3V, 3.0V, 2.5V, and 1.8V Supplies
♦ Adjustable Voltage Threshold Monitors Down to
0.62V with 1.5% Accuracy
♦ Low 35µA Supply Current
♦ Open-Drain RESET Output with 10µA Internal
Pullup
♦ 5µs Propagation Delay (MAX6700)
♦ 140ms (min) Reset Timeout Period (MAX6710)
♦ RESET Valid to IN1 = 1V or IN2 = 1V
♦ Immune to Short Monitored Supply Transients
♦ Guaranteed from -40°C to +85°C
♦ Small 6-Pin SOT23 Package
Ordering Information
TEMP RANGE
PIN-PACKAGE
MAX6700UT-T
PART
-40°C to +85°C
6 SOT23-6
MAX6710_UT-T
-40°C to +85°C
6 SOT23-6
Insert the desired suffix letter from the Selector Guide into the
blank to complete the part number. There is a 2500 piece minimum order increment requirement on the SOT package. These
devices are available in tape-and-reel only.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
Telecommunications
Typical Operating Circuit
High-End Printers
Desktop and Notebook Computers
Data Storage Equipment
Networking Equipment
IN1
Industrial Equipment
Set-Top Boxes
Servers/Workstations
SUPPLIES
TO BE
MONITORED
MAX6700
MAX6710
IN2
RESET
µP
IN3
IN4
Selector Guide with top marks appears at end of data sheet.
GND
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
MAX6700/MAX6710
General Description
MAX6700/MAX6710
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
ABSOLUTE MAXIMUM RATINGS
VCC, IN_, RESET to GND..........................................-0.3V to +6V
Continuous RESET Current .................................................20mA
Continuous Power Dissipation
6-Pin SOT23 (derate 8.7mW/°C above +70°C).........695.7mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature ......................................................+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
(VIN2 = 1V to 5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VIN2 = 3.0V to 3.3V, TA = +25°C.) (Note 1)
PARAMETER
Operating Voltage Range
(Note 2)
Input Current
SYMBOL
VCC
VIN2
IIN_
ICC
Threshold Voltage
Adjustable Threshold
2
VTH
VTH
Reset Threshold Hysteresis
VHYST
Reset Threshold Temperature
Coefficient
TCVTH
CONDITIONS
MAX6700/MAX6710Q
All others (Note 3)
MIN
TYP
2.0
MAX
5.5
TA = 0oC to +85oC
1.0
5.5
TA = -40oC to +85oC
1.2
5.5
IN_ = nominal input voltage (for 1.8V, 2.5V,
and 5.0V supplies)
25
40
IN2 = nominal input voltage (for 3.0V and
3.3V supplies) (Note 4)
55
115
0.4
VIN3, VIN4 = 0 to 0.85V
(for adjustable thresholds)
0.2
MAX6700/MAX6710Q only, VCC = 5.5V
35
50
5V (-5%)
4.50
4.63
4.75
5V (-10%)
4.25
4.38
4.50
3.3V (-5%)
3.00
3.08
3.15
3.3V (-10%)
2.85
2.93
3.00
3.0V (-5%)
2.70
2.78
2.85
3.0V (-10%)
2.55
2.63
2.70
2.5V (-5%)
2.25
2.32
2.38
2.5V (-10%)
2.13
2.19
2.25
1.8V (-5%)
1.62
1.67
1.71
1.8V (-10%)
1.53
1.58
1.62
0.611
0.620
0.629
IN_ decreasing
IN_ increasing relative to IN_ decreasing
IN_ to Reset Delay
tRD
VIN falling at 10mV/µs from VTH to (VTH - 50mV)
Propagation Delay
tPD
MAX6700 only
Reset Timeout Period
tRP
MAX6710 only
V
µA
VIN1 = 0 to 0.85V (for adjustable thresholds)
IN_ decreasing
UNITS
V
0.3
%VTH
60
ppm/oC
30
µs
5
140
V
200
_______________________________________________________________________________________
µs
280
ms
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
MAX6700/MAX6710
ELECTRICAL CHARACTERISTICS (continued)
(VIN2 = 1V to 5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VIN2 = 3.0V to 3.3V, TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
RESET Output Low
VOL
RESET Output High
VOH
RESET Output High Source
Current
Note 1:
Note 2:
Note 3:
Note 4:
CONDITIONS
MIN
TYP
0.3
VIN2, VCC = 2.5V, ISINK = 1.2mA
0.4
VIN2 = 1.0V, ISINK = 50µA, TA = 0oC to +85oC
0.3
VCC ≥ 2.0V, ISOURCE = 6µA, RESET
deasserted (MAX6700/MAX6710Q)
0.8 ✕ VCC
VIN2 ≥ 2.0V, ISOURCE = 6µA, RESET
deasserted
0.8 ✕ VIN2
UNITS
V
V
VIN2 ≥ 2.0V, RESET deasserted
IOH
MAX
VIN2, VCC = 5V, ISINK = 2mA
10
µA
100% production tested at TA = +25°C. Limits over temperature guaranteed by design.
The devices are powered from IN2 or VCC (for MAX6700/MAX6710Q).
The RESET output is guaranteed to be in the correct state for IN1 or IN2 down to 1V.
Monitored IN2 voltage (3.3V, 3.0V) is also the device power supply. Supply current splits as follows: 25µA for the resistor
divider (for the monitored voltage) and 30µA for other circuits.
Typical Operating Characteristics
(VIN2 = VCC = 3.0V, TA = +25°C)
VIN2 = 3.3V
52
50
48
VIN2 = 3V
46
70
60
50
40
30
44
20
42
10
-40
-15
10
35
TEMPERATURE (°C)
60
85
0.08
VIN2 = 3.3V
0.06
0.04
VTH = 1.8V
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.10
0
40
0.10
NORMALIZED THRESHOLD ERROR (%)
54
80
IN2 INPUT CURRENT (µA)
56
MAX6700 toc02
58
IN2 INPUT CURRENT (µA)
90
MAX6700 toc01
60
NORMALIZED THRESHOLD ERROR
vs. TEMPERATURE
IN2 INPUT CURRENT vs. IN2 VOLTAGE
MAX6700 toc03
IN2 INPUT CURRENT vs. TEMPERATURE
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
IN2 VOLTAGE (V)
-40
-15
10
35
60
85
TEMPERATURE (°C)
_______________________________________________________________________________________
3
Typical Operating Characteristics (continued)
(VIN2 = VCC = 3.0V, TA = +25°C)
RESET DELAY vs. RESET THRESHOLD
OVERDRIVE (IN_ DECREASING)
MAXIMUM IN_ TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
80
MAX6700 toc05
90
90
80
IN_
100mV/div
AC-COUPLED
70
RESET DELAY (µs)
70
RESET PULLUP AND PULLDOWN
RESPONSE (CL = 47pF)
MAX6700 toc06
100
MAX6700 toc04
MAXIMUM IN_ TRANSIENT DURATION (µs)
100
60
50
RESET ASSERTED
ABOVE THIS LINE
40
30
60
50
40
RESET
2V/div
30
20
20
10
10
0
0
0 100 200 300 400 500 600 700 800 900 1000
RESET THRESHOLD OVERDRIVE (mV)
10µs/div
0 100 200 300 400 500 600 700 800 900 1000
RESET THRESHOLD OVERDRIVE (mV)
RESET TIMEOUT DELAY
vs. TEMPERATURE
RESET TIMEOUT DELAY (ms)
RESET TIMEOUT DELAY (MAX6710)
RESET PROPAGATION DELAY (MAX6700)
MAX6700 toc09
MAX6700 toc08
232
231
230
229
228
227
226
225
224
223
222
221
220
MAX6700 toc07
MAX6700/MAX6710
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
-40
-15
10
35
60
85
IN_
2V/div
IN_
2V/div
RESET
2V/div
RESET
2V/div
40ms/div
2µs/div
TEMPERATURE (°C)
Pin Description
PIN
NAME
1
IN1
Input Voltage 1. See the Selector Guide for monitored voltages.
IN2
IN3
Input Voltage 2. See the Selector Guide for monitored voltages. IN2 is the power-supply input for the
device. For the MAX6700/MAX6710Q, VCC is the power-supply input for the device and is not a monitored
voltage
Input Voltage 3. See the Selector Guide for monitored voltages.
4
IN4
Input Voltage 4. See the Selector Guide for monitored voltages.
5
GND
2
3
6
4
VCC
RESET
FUNCTION
Ground
Active-Low, Reset Output. RESET goes low when any input goes below its specified threshold. After all
inputs rise above their threshold voltage, RESET remains low for 5µs (MAX6700) or for 200ms (MAX6710)
before going high. The open-drain RESET output has a weak (10µA) internal pullup to IN2 or VCC.
_______________________________________________________________________________________
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
MAX6700/MAX6710
VCC
VCC
IN1
MAX6700
VCC
VCC
IN3
RESET
UVLO
VCC
IN4
0.62V
REFERENCE
Figure 1. MAX6700 Functional Diagram
Detailed Description
The MAX6700/MAX6710 are very small, low-power,
triple/quad voltage µP supervisory circuits designed to
maintain system integrity in multisupply systems
(Figures 1 and 2). The MAX6710 offers several internally
trimmed undervoltage threshold options for monitoring
5.0V, 3.3V, 3.0V, 2.5V, and 1.8V supplies. The
MAX6700/MAX6710 offer one to three adjustable thresholds for monitoring voltages down to 0.62V.
The triple/quad voltage monitors include an accurate
bandgap reference, precision comparators, and a series
of internally trimmed resistor-divider networks to set the
factory-fixed reset threshold options. The resistor networks scale the specified IN_ reset voltages to match the
internal bandgap reference/comparator voltage.
Adjustable threshold options bypass the internal resistor
networks and connect directly to one of the comparator
inputs (use an external resistor-divider network for
threshold matching). The MAX6700/MAX6710Q provide
a separate unmonitored power-supply input (VCC) and
three adjustable voltage inputs.
Each of the internal comparators has a typical hysteresis
of 0.3% with respect to its reset threshold. This built-in
hysteresis improves the monitor’s immunity to ambient
noise without significantly reducing threshold accuracy.
The MAX6700/MAX6710 are immune to short IN_ transients. See the Typical Operating Characteristics for a
glitch immunity graph.
_______________________________________________________________________________________
5
MAX6700/MAX6710
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
ALL DEVICES ARE POWERED FROM IN2, VCC (3.0V/3.3V). RESET IS VALID IF VIN1 OR VIN2 IS GREATER THAN 1V, OR IF VCC IS GREATER THAN 2V (MAX6710Q ONLY)
IN1
(ADJ)
MAX6710
IN2, VCC
(3.3V/3V)
IN2, VCC
RESET
TIMEOUT
(200ms)
NOR
GATE
IN3
(2.5V/1.8V)
UVLO
IN4
(ADJ)
0.62V
REFERENCE
Figure 2. MAX6710 Functional Diagram
Applications Information
Reset Output
The MAX6700 RESET output asserts low when any
monitored IN_ voltage drops below its specified reset
threshold and remains low for the propagation delay
(5µs) after all inputs exceed their thresholds (Figure 3).
The MAX6710 provides an extended reset timeout period of 140ms (min). The output is open drain with a
6
weak internal pullup to the monitored IN2 or VCC supply
(10µA typ). For many applications no external pullup
resistor is required to interface with other logic devices.
An external pullup resistor to any voltage from 0 to 5.5V
can overdrive the internal pullup if interfacing to different logic-supply voltages (Figure 4). Internal circuitry
prevents reverse current flow from the external pullup
voltage to IN2.
_______________________________________________________________________________________
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
V CC powers the MAX6700/MAX6710Q and is not a
monitored voltage. IN2 powers all other options for the
MAX6710 and is a monitored voltage. When any supply
drops below its threshold, the reset output asserts low
and remains low while either IN1 or IN2 is above 1.0V.
VTH_
Adjustable Thresholds
RESET
90%
10%
tRP
tRD
Figure 3. RESET Output Timing Diagram
The MAX6700/MAX6710 offer several monitor options
with adjustable reset thresholds. The threshold voltage at
each adjustable IN_ input is typically 0.62V. To monitor a
voltage > 0.62V, connect a resistor-divider network to the
circuit as shown in Figure 5.
VINTH = 0.62V x (R1 + R2) / R2
or, solved in terms of R1:
+5V
IN2 = +3.3V
100kΩ
IN2
VCC
RESET
RESET
R1 = R2 ((VINTH / 0.62V) - 1)
Because the MAX6700/MAX6710 have a guaranteed
input current of ±0.2µA (±0.4µA for IN1) on their
adjustable inputs, resistor values up to 100kΩ can be
used for R2 with < 1% error. The MAX6700/MAX6710Q
include an internal voltage clamp (1.5V typ) at each of
the adjustable voltage inputs. An input voltage higher
than 1.5V induces a higher input current.
Unused Inputs
MAX6700
MAX6710
GND
GND
Figure 4. Interfacing to Different Logic-Supply Voltage
Connect unused monitor inputs to a supply voltage
greater in magnitude than their specified threshold voltages. For unused IN_ adjustable inputs, connect a 1MΩ
series resistor between the unused input and IN2 (or
VCC) to limit the bias current. Use IN2 for normal operation (device power-supply pin). Do not connect unused
monitor inputs to ground or allow them to float.
Adding Manual Reset Capability
(MAX6710)
VINTH
Figure 6 shows an application circuit adding manual reset
to the MAX6710. Depressing the pushbutton switch shortcircuits the analog input to ground and initiates a RESET
pulse. The switch must be open for at least 140ms in
order to deassert the RESET output. No external switch
debounce is required. Use a small capacitor to improve
noise immunity when using long leads from the pushbutton switch to the adjustable input.
R1
R2
Power-Supply Bypassing and Grounding
VREF = 0.62V
R1 = R2
Figure 5. Setting the Auxiliary Monitor
VINTH
- 1)
( 0.62V
The MAX6700/MAX6710 are normally powered from the
monitored IN2 or from the VCC supply input. All monitored
inputs are immune to short supply transients. For higher
immunity in noisy applications, connect a 0.1µF bypass
capacitor from the IN2 input to ground. Add capacitance
to IN1, IN3, and IN4 to increase their noise immunity.
_______________________________________________________________________________________
7
MAX6700/MAX6710
IN_
VTH_
MAX6700/MAX6710
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
Pin Configuration
IN1
IN2
TOP VIEW
MAX6710
IN3
IN1 1
6
RESET
5
GND
4
IN4
RESET
R1
IN4
(ADJUSTABLE
INPUT)
(VCC) IN2 2
GND
IN3 3
MAX6700
MAX6710
R2
SOT23
( ) ARE FOR MAX6700/MAX6710Q ONLY
Figure 6. Adding Manual Reset Capability
Chip Information
TRANSISTOR COUNT: 699
PROCESS: BiCMOS
Selector Guide
NOMINAL INPUT VOLTAGE
IN1
(V)
IN2
(V)
IN3
(V)
IN4
(V)
SUPPLY
TOLERANCE
(%)
TOP
MARK
MAX6700UT
Adj*
VCC
Adj*
Adj*
N/A
ABEK
MAX6710AUT
5
3.3
2.5
Adj*
10
AAZA
MAX6710BUT
5
3.3
2.5
Adj*
5
AAZB
MAX6710CUT
5
3.3
1.8
Adj*
10
AAZC
MAX6710DUT
5
3.3
1.8
Adj*
5
AAZD
MAX6710EUT
Adj*
3.3
2.5
1.8
10
AAZE
MAX6710FUT
Adj*
3.3
2.5
1.8
5
AAZF
PART**
(SUFFIX IN BOLD)
MAX6710GUT
5
3.3
Adj*
Adj*
10
AAZG
MAX6710HUT
5
3.3
Adj*
Adj*
5
AAZH
MAX6710IUT
Adj*
3.3
2.5
Adj*
10
AAZI
MAX6710JUT
Adj*
3.3
2.5
Adj*
5
AAZJ
MAX6710KUT
Adj*
3.3
1.8
Adj*
10
AAZK
MAX6710LUT
Adj*
3.3
1.8
Adj*
5
AAZL
AAZM
MAX6710MUT
Adj*
3
2.5
Adj*
10
MAX6710NUT
Adj*
3
2.5
Adj*
5
AAZN
MAX6710OUT
Adj*
3
1.8
Adj*
10
AAZO
MAX6710PUT
Adj*
3
1.8
Adj*
5
AAZP
MAX6710QUT
Adj*
VCC
Adj*
Adj*
N/A
AAZQ
*Adjustable voltage based on 0.62V internal threshold. External threshold voltage can be set using an external resistor-divider.
**The MAX6700 acts as a voltage detector with a 5µs propagation delay. The MAX6710 serves as a microprocessor reset circuit with a
140ms (min) reset timeout.
8
_______________________________________________________________________________________
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
6LSOT.EPS
PACKAGE OUTLINE, SOT 6L BODY
21-0058
G
1
1
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9
© 2005 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
MAX6700/MAX6710
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
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