General Description
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 com-
ponent count while improving reliability compared to sep-
arate ICs or discrete components.
A variety of factory-trimmed threshold voltages are avail-
able to accommodate different supply voltages and toler-
ances with minimal external component requirements.
The MAX6710 includes internally fixed options for moni-
toring 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 volt-
ages down to 0.62V. The MAX6700 monitors three volt-
ages 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
Telecommunications
High-End Printers
Desktop and Notebook Computers
Data Storage Equipment
Networking Equipment
Industrial Equipment
Set-Top Boxes
Servers/Workstations
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
MAX6700/MAX6710
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
________________________________________________________________ Maxim Integrated Products 1
19-2324; Rev 2; 12/05
Ordering Information
Insert the desired suffix letter from the Selector Guide into the
blank to complete the part number. There is a 2500 piece mini-
mum 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.
Pin Configuration appears at end of data sheet.
PART TEMP RANGE
PIN-PACKAGE
MAX6700UT-T -40°C to +85°C 6 SOT23-6
MAX6710_UT-T -40°C to +85°C 6 SOT23-6
MAX6700
MAX6710
IN1
IN2
IN3
IN4
RESET
GND
SUPPLIES
TO BE
MONITORED
µP
Typical Operating Circuit
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.
Selector Guide with top marks appears at end of data sheet.
MAX6700/MAX6710
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
2_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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, 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
PARAMETER
SYM B O L
CONDITIONS
MIN
TYP
MAX
VCC MAX6700/MAX6710Q
2.0 5.5
TA = 0oC to +85oC
1.0 5.5
Operating Voltage Range
(Note 2) VIN2 All others (Note 3)
TA = -40oC to +85oC 1.2 5.5
V
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
VIN1 = 0 to 0.85V (for adjustable thresholds)
0.4
IIN_
VIN3, VIN4 = 0 to 0.85V
(for adjustable thresholds)
0.2
Input Current
ICC MAX6700/MAX6710Q only, VCC = 5.5V
35
50
µA
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
Threshold Voltage VTH IN_ decreasing
1.8V (-10%)
1.53 1.58 1.62
V
Adjustable Threshold VTH IN_ decreasing
0.611 0.620 0.629
V
Reset Threshold Hysteresis
VHYST
IN_ increasing relative to IN_ decreasing
0.3
Reset Threshold Temperature
Coefficient
TCVTH 60
IN_ to Reset Delay tRD V
IN fal l i ng at 10m V /µs fr om V
TH
to ( V
TH
- 50m V )
30
µs
Propagation Delay tPD MAX6700 only 5 µs
Reset Timeout Period tRP MAX6710 only
140 200 280
ms
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)
MAX6700/MAX6710
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
_______________________________________________________________________________________ 3
Note 1: 100% production tested at TA= +25°C. Limits over temperature guaranteed by design.
Note 2: The devices are powered from IN2 or VCC (for MAX6700/MAX6710Q).
Note 3: The RESET output is guaranteed to be in the correct state for IN1 or IN2 down to 1V.
Note 4: 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.
40
46
44
42
48
50
52
54
56
58
60
-40 -15 10 35 60 85
IN2 INPUT CURRENT vs. TEMPERATURE
MAX6700 toc01
TEMPERATURE (°C)
IN2 INPUT CURRENT (µA)
VIN2 = 3.3V
VIN2 = 3V
0
20
10
50
40
30
60
70
80
90
01.01.50.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
IN2 INPUT CURRENT vs. IN2 VOLTAGE
MAX6700 toc02
IN2 VOLTAGE (V)
IN2 INPUT CURRENT (µA)
-0.10
-0.04
-0.06
-0.08
-0.02
0
0.02
0.04
0.06
0.08
0.10
-40 -15 10 35 60 85
NORMALIZED THRESHOLD ERROR
vs. TEMPERATURE
MAX6700 toc03
TEMPERATURE (°C)
NORMALIZED THRESHOLD ERROR (%)
VTH = 1.8V
VIN2 = 3.3V
Typical Operating Characteristics
(VIN2 = VCC = 3.0V, TA= +25°C)
PARAMETER
SYM B O L
CONDITIONS
MIN
TYP
MAX
UNITS
VIN2, VCC = 5V, ISINK = 2mA
0.3
VIN2, VCC = 2.5V, ISINK = 1.2mA
0.4
RESET Output Low VOL
VIN2 = 1.0V, ISINK = 50µA, TA = 0oC to +85oC
0.3
V
VCC ≥ 2.0V, ISOURCE = 6µA, RESET
deasserted (MAX6700/MAX6710Q)
0.8 ✕ VCC
RESET Output High VOH VIN2 ≥ 2.0V, ISOURCE = 6µA, RESET
deasserted
0.8 ✕ VIN2
V
RESET Output High Source
Current IOH VIN2 ≥ 2.0V, RESET deasserted
10
µA
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)
Pin Description
PIN
NAME
FUNCTION
1IN1 Input Voltage 1. See the Selector Guide for monitored voltages.
IN2
2VCC
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
3IN3 Input Voltage 3. See the Selector Guide for monitored voltages.
4IN4 Input Voltage 4. See the Selector Guide for monitored voltages.
5GND Ground
6
RESET
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.
MAX6700/MAX6710
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
4_______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VIN2 = VCC = 3.0V, TA= +25°C)
220
222
221
223
224
225
226
227
228
229
230
231
232
MAX6700 toc07
TEMPERATURE (°C)
-40 10-15 35 60 85
RESET TIMEOUT DELAY
vs. TEMPERATURE
RESET TIMEOUT DELAY (ms)
40ms/div
MAX6700 toc09
RESET
2V/div
IN_
2V/div
RESET TIMEOUT DELAY (MAX6710)
0
20
10
40
30
60
50
70
90
80
100
0200 300 400100 500 600 700 900800 1000
MAX6700 toc04
MAXIMUM IN_ TRANSIENT DURATION (µs)
RESET ASSERTED
ABOVE THIS LINE
RESET THRESHOLD OVERDRIVE (mV)
MAXIMUM IN_ TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
0
20
10
40
30
60
50
70
90
80
100
0200300 400100 500 600 700 900800 1000
MAX6700 toc05
RESET THRESHOLD OVERDRIVE (mV)
RESET DELAY vs. RESET THRESHOLD
OVERDRIVE (IN_ DECREASING)
RESET DELAY (µs)
IN_
100mV/div
AC-COUPLED
10µs/div
MAX6700 toc06
RESET PULLUP AND PULLDOWN
RESPONSE (CL = 47pF)
RESET
2V/div
2µs/div
MAX6700 toc08
RESET
2V/div
RESET PROPAGATION DELAY (MAX6700)
IN_
2V/div
MAX6700/MAX6710
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
_______________________________________________________________________________________ 5
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 thresh-
olds 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 net-
works 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_ tran-
sients. See the Typical Operating Characteristics for a
glitch immunity graph.
IN1
IN3
IN4
0.62V
REFERENCE
VCC
RESET
MAX6700
VCC
VCC
VCC
VCC
UVLO
Figure 1. MAX6700 Functional Diagram
MAX6700/MAX6710
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
6_______________________________________________________________________________________
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 peri-
od of 140ms (min). The output is open drain with a
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 differ-
ent logic-supply voltages (Figure 4). Internal circuitry
prevents reverse current flow from the external pullup
voltage to IN2.
IN1
(ADJ)
IN2, VCC
(3.3V/3V)
IN3
(2.5V/1.8V)
IN4
(ADJ)
0.62V
REFERENCE
NOR
GATE
TIME-
OUT
(200ms)
IN2, VCC
RESET
MAX6710
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)
UVLO
Figure 2. MAX6710 Functional Diagram
VCC 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.
Adjustable Thresholds
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:
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 100kΩcan 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
Connect unused monitor inputs to a supply voltage
greater in magnitude than their specified threshold volt-
ages. 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 opera-
tion (device power-supply pin). Do not connect unused
monitor inputs to ground or allow them to float.
Adding Manual Reset Capability
(MAX6710)
Figure 6 shows an application circuit adding manual reset
to the MAX6710. Depressing the pushbutton switch short-
circuits 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 pushbut-
ton switch to the adjustable input.
Power-Supply Bypassing and Grounding
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.
MAX6700/MAX6710
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
_______________________________________________________________________________________ 7
Figure 3.
RESET
Output Timing Diagram
Figure 5. Setting the Auxiliary Monitor
VTH_
90%
10%
IN_
VTH_
RESET
tRP
tRD
VREF = 0.62V
R2
R1
VINTH
R1 = R2 ( - 1)
VINTH
0.62V
Figure 4. Interfacing to Different Logic-Supply Voltage
IN2
GND
IN2 = +3.3V +5V
MAX6700
MAX6710
VCC
GND
RESET
RESET
100kΩ
MAX6700/MAX6710
Chip Information
TRANSISTOR COUNT: 699
PROCESS: BiCMOS
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
8_______________________________________________________________________________________
NOMINAL INPUT VOLTAGE
PART**
(SUFFIX IN BOLD) 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
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
MAX6710MUT Adj* 3 2.5 Adj* 10 AAZM
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
Selector Guide
*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.
Figure 6. Adding Manual Reset Capability
IN1
IN2
IN3
MAX6710
GND
RESET
IN4
(ADJUSTABLE
INPUT)
R1
R2
Pin Configuration
(VCC) IN2
IN4IN3
16
5GND
IN1
( ) ARE FOR MAX6700/MAX6710Q ONLY
MAX6700
MAX6710
SOT23
TOP VIEW
2
34
RESET
MAX6700/MAX6710
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
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.
6LSOT.EPS
PACKAGE OUTLINE, SOT 6L BODY
21-0058
1
1
G
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.)