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19-2324; Rev 2; 12/05
Low-Voltage, High-Accuracy, Triple/Quad Voltage P Supervisory Circuits in SOT Package
General Description
The MAX6700/MAX6710 precision triple/quad voltage microprocessor (P) 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 (10A) 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 5s 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 (-40C to +85C) temperature range.
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 35A Supply Current Open-Drain RESET Output with 10A Internal Pullup 5s 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 -40C to +85C Small 6-Pin SOT23 Package
MAX6700/MAX6710
Ordering Information
PART MAX6700UT-T MAX6710_UT-T TEMP RANGE -40C to +85C -40C to +85C PIN-PACKAGE 6 SOT23-6 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.
________________________Applications
Telecommunications High-End Printers Desktop and Notebook Computers Data Storage Equipment Networking Equipment Industrial Equipment Set-Top Boxes Servers/Workstations
Selector Guide with top marks appears at end of data sheet.
Typical Operating Circuit
IN1 SUPPLIES TO BE MONITORED IN2 IN3 IN4
MAX6700 MAX6710
RESET P
GND
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
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Low-Voltage, High-Accuracy, Triple/Quad Voltage P Supervisory Circuits in SOT Package MAX6700/MAX6710
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 +70C).........695.7mW Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-65C to +150C Junction Temperature ......................................................+150C Lead Temperature (soldering, 10s) .................................+300C
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 = -40C to +85C, unless otherwise noted. Typical values are at VIN2 = 3.0V to 3.3V, TA = +25C.) (Note 1)
PARAMETER Operating Voltage Range (Note 2) SYMBOL VCC VIN2 CONDITIONS MAX6700/MAX6710Q All others (Note 3) TA = 0oC to +85oC TA = -40oC to +85oC MIN 2.0 1.0 1.2 25 55 TYP MAX 5.5 5.5 5.5 40 115 A 0.4 0.2 35 4.50 4.25 3.00 2.85 2.70 2.55 2.25 2.13 1.62 1.53 0.611 4.63 4.38 3.08 2.93 2.78 2.63 2.32 2.19 1.67 1.58 0.620 0.3 60 VIN falling at 10mV/s from VTH to (VTH - 50mV) MAX6700 only MAX6710 only 140 30 5 200 280 50 4.75 4.50 3.15 3.00 2.85 2.70 2.38 2.25 1.71 1.62 0.629 V %VTH ppm/oC s s ms V V UNITS
IN_ = nominal input voltage (for 1.8V, 2.5V, and 5.0V supplies) IIN_ IN2 = nominal input voltage (for 3.0V and 3.3V supplies) (Note 4) VIN1 = 0 to 0.85V (for adjustable thresholds) VIN3, VIN4 = 0 to 0.85V (for adjustable thresholds) ICC MAX6700/MAX6710Q only, VCC = 5.5V 5V (-5%) 5V (-10%) 3.3V (-5%) 3.3V (-10%) Threshold Voltage VTH IN_ decreasing 3.0V (-5%) 3.0V (-10%) 2.5V (-5%) 2.5V (-10%) 1.8V (-5%) 1.8V (-10%) Adjustable Threshold Reset Threshold Hysteresis Reset Threshold Temperature Coefficient IN_ to Reset Delay Propagation Delay Reset Timeout Period VTH VHYST TCVTH tRD tPD tRP IN_ decreasing IN_ increasing relative to IN_ decreasing
Input Current
2
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Low-Voltage, High-Accuracy, Triple/Quad Voltage P Supervisory Circuits in SOT Package
ELECTRICAL CHARACTERISTICS (continued)
(VIN2 = 1V to 5.5V, TA = -40C to +85C, unless otherwise noted. Typical values are at VIN2 = 3.0V to 3.3V, TA = +25C.) (Note 1)
PARAMETER RESET Output Low SYMBOL VOL CONDITIONS VIN2, VCC = 5V, ISINK = 2mA VIN2, VCC = 2.5V, ISINK = 1.2mA VIN2 = 1.0V, ISINK = 50A, TA = 0oC to +85oC VCC 2.0V, ISOURCE = 6A, RESET deasserted (MAX6700/MAX6710Q) VOH VIN2 2.0V, ISOURCE = 6A, RESET deasserted VIN2 2.0V, RESET deasserted 0.8 VCC V 0.8 VIN2 10 A MIN TYP MAX 0.3 0.4 0.3 V UNITS
MAX6700/MAX6710
RESET Output High
RESET Output High Source Current
IOH
Note 1: Note 2: Note 3: Note 4:
100% production tested at TA = +25C. 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: 25A for the resistor divider (for the monitored voltage) and 30A for other circuits.
Typical Operating Characteristics
(VIN2 = VCC = 3.0V, TA = +25C)
NORMALIZED THRESHOLD ERROR vs. TEMPERATURE
MAX6700 toc02
IN2 INPUT CURRENT vs. TEMPERATURE
MAX6700 toc01
IN2 INPUT CURRENT vs. IN2 VOLTAGE
90 80 IN2 INPUT CURRENT (A) 70 60 50 40 30 20 10 0 0.10 0.08 NORMALIZED THRESHOLD ERROR (%) 0.06 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.10 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
58 56 IN2 INPUT CURRENT (A) 54 52 50 48 46 44 42 40 -40 -15 10 35 60 VIN2 = 3V VIN2 = 3.3V
VIN2 = 3.3V
VTH = 1.8V
85
-15
10
35
60
85
TEMPERATURE (C)
TEMPERATURE (C)
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3
MAX6700 toc03
60
Low-Voltage, High-Accuracy, Triple/Quad Voltage P Supervisory Circuits in SOT Package MAX6700/MAX6710
Typical Operating Characteristics (continued)
(VIN2 = VCC = 3.0V, TA = +25C)
MAXIMUM IN_ TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE
MAX6700 toc04
RESET DELAY vs. RESET THRESHOLD OVERDRIVE (IN_ DECREASING)
90 80 70 RESET DELAY (s) 60 50 40 30 20 10 0
MAX6700 toc05
RESET PULLUP AND PULLDOWN RESPONSE (CL = 47pF)
100 MAXIMUM IN_ TRANSIENT DURATION (s) 90 80 70 60 50 40 30 20 10 0 RESET ASSERTED ABOVE THIS LINE
100
MAX6700 toc06
IN_ 100mV/div AC-COUPLED
RESET 2V/div
0 100 200 300 400 500 600 700 800 900 1000 RESET THRESHOLD OVERDRIVE (mV)
0 100 200 300 400 500 600 700 800 900 1000 RESET THRESHOLD OVERDRIVE (mV)
10s/div
RESET TIMEOUT DELAY vs. TEMPERATURE
232 231 230 229 228 227 226 225 224 223 222 221 220 -40 -15 10 35 60 TEMPERATURE (C)
MAX6700 toc07
RESET PROPAGATION DELAY (MAX6700)
MAX6700 toc08
RESET TIMEOUT DELAY (MAX6710)
MAX6700 toc09
RESET TIMEOUT DELAY (ms)
IN_ 2V/div
IN_ 2V/div
RESET 2V/div
RESET 2V/div
85
2s/div
40ms/div
Pin Description
PIN 1 2 3 4 5 6 NAME IN1 IN2 VCC IN3 IN4 GND RESET FUNCTION Input Voltage 1. See the Selector Guide for monitored voltages. 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. Input Voltage 4. See the Selector Guide for monitored voltages. 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 5s (MAX6700) or for 200ms (MAX6710) before going high. The open-drain RESET output has a weak (10A) internal pullup to IN2 or VCC.
4
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Low-Voltage, High-Accuracy, Triple/Quad Voltage P 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 P 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.
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5
Low-Voltage, High-Accuracy, Triple/Quad Voltage P Supervisory Circuits in SOT Package MAX6700/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)
IN1 (ADJ)
MAX6710
IN2, VCC (3.3V/3V)
IN2, VCC
RESET NOR GATE IN3 (2.5V/1.8V) TIMEOUT (200ms)
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 (5s) 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 (10A 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.
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Low-Voltage, High-Accuracy, Triple/Quad Voltage P Supervisory Circuits in SOT Package
IN_ VTH_ VTH_
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.
MAX6700/MAX6710
RESET 90% 10% tRD tRP
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:
IN2 = +3.3V +5V
Figure 3. RESET Output Timing Diagram
R1 = R2 ((VINTH / 0.62V) - 1) Because the MAX6700/MAX6710 have a guaranteed input current of 0.2A (0.4A for IN1) on their adjustable inputs, resistor values up to 100k 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.
100k IN2 VCC
RESET
RESET
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 1M 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 R1
R2
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.
Power-Supply Bypassing and Grounding
VREF = 0.62V R1 = R2 VINTH ( 0.62V - 1)
Figure 5. Setting the Auxiliary Monitor
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 0.1F bypass capacitor from the IN2 input to ground. Add capacitance to IN1, IN3, and IN4 to increase their noise immunity.
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7
Low-Voltage, High-Accuracy, Triple/Quad Voltage P Supervisory Circuits in SOT Package MAX6700/MAX6710
Pin Configuration
IN1 IN2 IN3 IN1 1 R1 IN4 (ADJUSTABLE INPUT) R2 GND IN3 3 4 IN4 RESET (VCC) IN2 2 6 RESET
TOP VIEW
MAX6710
MAX6700 MAX6710
5
GND
SOT23
Figure 6. Adding Manual Reset Capability
( ) ARE FOR MAX6700/MAX6710Q ONLY
Chip Information
TRANSISTOR COUNT: 699 PROCESS: BiCMOS
Selector Guide
NOMINAL INPUT VOLTAGE PART** (SUFFIX IN BOLD) MAX6700UT MAX6710AUT MAX6710BUT MAX6710CUT MAX6710DUT MAX6710EUT MAX6710FUT MAX6710GUT MAX6710HUT MAX6710IUT MAX6710JUT MAX6710KUT MAX6710LUT MAX6710MUT MAX6710NUT MAX6710OUT MAX6710PUT MAX6710QUT IN1 (V) Adj* 5 5 5 5 Adj* Adj* 5 5 Adj* Adj* Adj* Adj* Adj* Adj* Adj* Adj* Adj* IN2 (V) VCC 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3 3 3 3 VCC IN3 (V) Adj* 2.5 2.5 1.8 1.8 2.5 2.5 Adj* Adj* 2.5 2.5 1.8 1.8 2.5 2.5 1.8 1.8 Adj* IN4 (V) Adj* Adj* Adj* Adj* Adj* 1.8 1.8 Adj* Adj* Adj* Adj* Adj* Adj* Adj* Adj* Adj* Adj* Adj* SUPPLY TOLERANCE (%) N/A 10 5 10 5 10 5 10 5 10 5 10 5 10 5 10 5 N/A TOP MARK ABEK AAZA AAZB AAZC AAZD AAZE AAZF AAZG AAZH AAZI AAZJ AAZK AAZL AAZM AAZN AAZO AAZP 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 5s propagation delay. The MAX6710 serves as a microprocessor reset circuit with a 140ms (min) reset timeout. 8 _______________________________________________________________________________________
Low-Voltage, High-Accuracy, Triple/Quad Voltage P Supervisory Circuits in SOT Package
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.)
6LSOT.EPS
MAX6700/MAX6710
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 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.

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