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19-1756; Rev 2; 10/01
Quad Voltage P Supervisory Circuit in SOT Package
General Description
The MAX6339 is a precision quad voltage monitor with microprocessor (P) supervisory reset timing. The device can monitor up to four system supply voltages without any external components and asserts a single reset if any supply voltage drops below its preset threshold. The device significantly reduces 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 selection includes internally fixed options for monitoring +5.0V, +3.3V, +3.0V, +2.5V, +1.8V, and -5.0V supplies with -5% and/or -10% tolerances. The device is also available with one or two user-adjustable threshold options if non-standard thresholds are desired (use external resistor-divider network). The quad monitor provides a single active-low reset output that is asserted when any monitored input is below its associated threshold. The output is open drain with a weak internal pull-up (10A) to IN2. Reset remains low for a reset timeout period (140ms min) after all voltages are above the selected thresholds. The output is valid as long as either the IN1 or IN2 input voltage remains >1V. The MAX6339 is available in a small 6-pin SOT23 package and operates over the extended (-40C to +85C) temperature range.
Features
o Monitors Four Power-Supply Voltages o Precision Factory-Set Reset Threshold Options for +5.0V, +3.3V, +3.0, +2.5V, +1.8V, and -5.0V Supplies o User-Adjustable Voltage Monitoring Threshold Options o Low 55A Supply Current o Open-Drain RESET Output with 10A Internal Pullup o 140ms (min) Reset Timeout Period o RESET Valid to IN1 = 1V or IN2 = 1V o Immune to Short Monitored Supply Transients o No External Components Required o Guaranteed from -40C to +85C o Small 6-Pin SOT23 Package
MAX6339
Ordering Information
PART MAX6339_UT-T* TEMP. RANGE -40C TO +85C PIN-PACKAGE 6 SOT23-6
________________________Applications
Telecommunications High-End Printers Desktop and Network Computers Data Storage Equipment Networking Equipment Industrial Equipment Set-Top Boxes
*Insert the desired 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 and these devices are available in tape-and-reel only.
Typical Operating Circuit
IN1 SUPPLIES TO BE MONITORED IN2 IN3 IN4
MAX6339 P
RESET
GND
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products
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Quad Voltage P Supervisory Circuit in SOT Package MAX6339
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND) Input Voltages (IN_ ) (except -5V)............................-0.3V to +6V RESET.......................................................................-0.3V to +6V Input Voltage (-5V Input) ..........................................-6V to +0.3V Continuous RESET Current .................................................20mA Continuous Power Dissipation (TA = +70C) 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, unless otherwise noted.) (Note 1)
PARAMETER Supply Voltage Range (Notes 2, 3) SYMBOL VIN2 VIN_ = input threshold voltage (input threshold voltage of 1.8V, 2.5V, 5V) VIN2 = input threshold voltage (input threshold voltage of 3.0V, 3.3V) (Note 4) IIN_ VIN_ = 0 to VIN2 (input threshold voltage = +1.23V) VIN1 = 1.5V (MAX6339 K/L only) VIN_ = -5V (input threshold voltage = -5V) +5V (-5%) threshold +5V (-10%) threshold +3.3V (-5%) threshold Reset Threshold Voltage VIN_ decreasing VTH +3.3V (-10%) threshold +3.0V (-5%) threshold +3.0V (-10%) threshold +2.5V (-10% ) threshold +1.8V (-10%) threshold VIN_ increasing Adjustable Threshold Threshold Voltage Temperature Coefficient Threshold Hysteresis Reset Delay Reset Active Timeout Period VHYST tRD tRP VIN = VTH to (VTH - 50mV) (all inputs except -5V) or VIN_ = VTH to (VTH + 50mV) (-5V input only) 140 VTH VIN decreasing -5V (+5%) threshold -5V (+10%) threshold 4.50 4.25 3.00 2.85 2.70 2.55 2.13 1.53 -4.75 -4.50 1.20 -0.1 0.4 -15 4.63 4.38 3.08 2.93 2.78 2.63 2.19 1.58 -4.63 -4.38 1.23 60 0.3 20 200 280 CONDITIONS MIN 1.0 25 55 TYP MAX 5.5 40 115 A 0.1 1.5 -20 4.75 4.50 3.15 3.00 2.85 2.70 2.25 1.62 -4.50 -4.25 1.26 V ppm/C % s ms V UNITS V
Input Current
2
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Quad Voltage P Supervisory Circuit 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, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS VIN2 = 5V, ISINK = 2mA Output Low Voltage VOL VIN2 = 2.5V, ISINK = 1.2mA VIN1 = VIN2 = 1V, ISINK = 50A Output High Voltage Output High Source Current Output High Source Current VIN2 > 2.55V, ISOURCE = 6A (RESET unasserted) 0.8 VIN2 6 10 MIN TYP MAX 0.4 0.4 0.4 V UNITS
MAX6339
VOH
V
IOH
VIN2 > 2.55V (RESET unasserted)
A
Note 1: Note 2: Note 3: Note 4:
100% production tested at TA = +25C. Limits over temperature guaranteed by design. The device is powered from input IN2. The RESET output is guaranteed to be in the correct state for IN1 or IN2 down to 1V. Monitored voltage (+3.3V, +3.0V) is also the device power supply. Supply current splits as follows: 25A for the resistordivider (for the monitored voltage) and 30A for other circuits.
Typical Operating Characteristics
(VIN2 = +3.0V, TA = +25C)
IIN2 INPUT CURRENT vs. IIN2 VOLTAGE
MAX6339toc02
IIN2 INPUT CURRENT vs. TEMPERATURE
80 IIN2 INPUT CURRENT (A) 75 70 65 60 55 50 45 40 35 -40 -20 0 20 40 60 80 TEMPERATURE (C) VIN2 = +3.0V VIN2 = +3.3V
MAX6339toc01
NORMALIZED THRESHOLD ERROR vs. TEMPERATURE
NORMALIZED THRESHOLD ERROR (%) 0.10 0.05 0 -0.5 -0.10 -0.15 -0.20 -0.25 VIN2 = +3.0V -0.30 -40 -20 0 20 40 60 80 VTH = 1.8V VTH = +5V
MAX6339toc03
85
85 80 IIN2 INPUT CURRENT ( A) 75 70 65 60 55 50 3.0 3.5 4.0 4.5 5.0
0.15
5.5
INPUT VOLTAGE (V)
TEMPERATURE (C)
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Quad Voltage P Supervisory Circuit in SOT Package MAX6339
Typical Operating Characteristics (continued)
(VIN2 = +3.0V, TA = +25C)
MAXIMUM IN_ TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE
MAX6339toc04
RESET DELAY vs. RESET THRESHOLD OVERDRIVE (IN_ decreasing)
70 60 RESET DELAY (s) 50 40 30 20 10 0 RESET 2V/div
MAX6339toc05
RESET PULL-UP AND PULL-DOWN RESPONSE (CL = 47pF)
MAX6339toc06
80 MAXIMUM IN_ TRANSIENT DURATION (s) 70 60 50 40 30 20 10 0 RESET ASSERTED ABOVE THIS LINE
80
IN_ 100mV/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
MAX6339toc07
RESET TIMEOUT DELAY
MAX6339toc08
215 210 RESET TIMEOUT DELAY (ms) 205 200 195 190 185 180 -40 -20 0 20 40 60 80 TEMPERATURE (C)
IN_ 2V/div
2V/div
RESET 2V/div
200ms/div
Pin Description
PIN 1 2 3 4 5 6 NAME IN1 IN2 IN3 IN4 GND RESET FUNCTION Input Voltage 1. See Selector Guide for monitored voltages. Input Voltage 2. See Selector Guide for monitored voltages. IN2 is the power-supply input for the device. Input Voltage 3. See Selector Guide for monitored voltages. Input Voltage 4. See Selector Guide for monitored voltages. Ground Reset Output, Active Low. RESET goes low when any input goes below its specified threshold. After all inputs are above their threshold voltage, RESET remains low for at least 140ms (minimum) before going high. RESET output is open drain with a weak internal pullup to IN2.
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Quad Voltage P Supervisory Circuit in SOT Package
Detailed Description
The MAX6339 is a very small, low-power, quad voltage P supervisory circuit designed to maintain system integrity in multi-supply systems (Figure 1). The device offers several internally trimmed undervoltage threshold options that minimize or eliminate the need for external components. Preset voltage monitoring options for +5.0V, +3.3V, +3.0V, +2.5V, +1.8V, and -5.0V make it ideal for telecommunications, desktop and notebook computers, high-end printers, data storage equipment, and networking equipment applications. The quad monitor/reset includes an accurate bandgap reference, four precision comparators, and a series of internal 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. Useradjustable threshold options bypass the internal resistor networks and connect directly to one of the comparator inputs (an external resistor-divider network is required for threshold matching). All threshold voltage options, fixed and adjustable, are indicated through a single-letter code in the product number (see Selector Guide). Each of the internal comparators has a typical hysteresis of 0.3% with respect to its reset threshold. This builtin hysteresis improves the monitor's immunity to ambient noise without significantly reducing threshold accuracy when an input sits at its specified reset voltage. The MAX6339 is also designed to ignore short IN_ transients. See Typical Operating Characteristics for a glitch immunity graph. threshold, the reset output is asserted and guaranteed to remain low while either IN1 or IN2 is above +1.0V.
MAX6339
User-Adjustable Thresholds
The MAX6339 offers several monitor options with useradjustable reset thresholds. The threshold voltage at each adjustable IN_ input is typically 1.23V. To monitor a voltage >1.23V, connect a resistor-divider network to the circuit as shown in Figure 4. VINTH = 1.23V x (R1 + R2) / R2 or, solved in terms of R1: R1 = R2 ((VINTH / 1.23V) - 1) Because the MAX6339 has a guaranteed input current of 0.1A on its adjustable inputs, resistor values up to 100k can be used for R2 with <1% error.
Unused Inputs
If some monitor inputs are to be unused, they must be tied to a supply voltage greater in magnitude than their specified threshold voltages. For unused IN3 or IN4 options with positive thresholds (fixed or adjustable), the inputs can be connected directly to the IN2 supply. For unused IN4 options with negative thresholds, the input must be tied to a more negative supply. The IN2 input must always be used for normal operation (device power-supply pin). Unused pins cannot be connected to ground or allowed to float.
Applications Information
Reset Output
The MAX6339 RESET output is asserted low when any of the monitored IN_ voltages drop below its specified reset threshold (or above for -5V option) and remain low for the reset timeout period (140ms minimum) after all inputs exceed their thresholds (Figure 2). The output is open drain with a weak internal pullup to the monitored IN2 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 3). Internal circuitry prevents reverse current flow from the external pullup voltage to IN2. The MAX6339 is normally powered from the monitored IN2 supply when all input voltages are above their specified thresholds. When any supply drops below its
Negative Voltage Monitoring Beyond -5V
The MAX6339 is offered with options to monitor -5V supplies with internally fixed thresholds. To monitor supplies more negative than -5V, a low-impedance resistor-divider network can be used external to the MAX6339 as shown in Figure 5. The current through the external resistor-divider should be greater than the input current for the -5V monitor options. For an input monitor current error of <1%, the resistor-divider current should 2mA (for I IN4 = 20A max). Set R2 = 2.5k. Calculate R1 based on the desired VIN_ reset threshold voltage, using the following formula: R1 = R2
[(VINTH / VTH ) -1]
where R2 2.49k, VINTH = desired threshold voltage and VTH is the internal threshold voltage.
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Quad Voltage P Supervisory Circuit in SOT Package MAX6339
ALL DEVICES ARE POWERED FROM IN2 (3.0V/3.3V). RESET IS VALID IF VIN1 OR VIN2 IS GREATER THAN 1V.
IN1 (5V)
MAX6339
IN1 IN1(5V) PULLUP IN2
IN2 (3.3/3V)
RESET NOR GATE IN3 (AUX) TIME OUT (200ms)
IN4 (-5V)
VREF
REFERENCE
Figure 1. MAX6339 Functional Diagram
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Quad Voltage P Supervisory Circuit in SOT Package
IN_ VTH_ VTH_
For -VIN = -12V nominal, VINTH = -11.1V, VTH = -4.63V, and R2 = 2.49k, R1 = 2.49k [(-11.1 / -4.63) -1] R1 = 3.48k
MAX6339
RESET 90% 10% tRD tRP
Power-Supply Bypassing and Grounding
The MAX6339 is normally powered from the monitored IN2 supply input. All monitor inputs are immune to short supply transients. If higher immunity is desired in noisy applications, connect 0.1F bypass capacitors from the IN2 input to ground. Additionally, capacitance can be added to IN1, IN3, and IN4 to increase their noise immunity.
Figure 2. RESET Output Timing Diagram
IN2 = +3.3V +5V
100k IN2 VCC -5V RESET
R2
RESET
R1 VINTH MAX6339 GND GND VREF = 1.23V R1 = R2 x
[( VVINTH )-1] TH
Figure 5. Negative Voltage Monitoring Beyond -5V Figure 3. Interfacing to Different Logic Supply Voltage
Pin Configuration
VINTH
TOP VIEW
IN1 1 6 RESET
R1
IN2 2
MAX6339
5
GND
R2
IN3 3
4
IN4
VREF = 1.23V R1 = R2
INTH ( V1.23 - 1)
SOT23
Chip Information
TRANSISTOR COUNT: 896 PROCESS: BiCMOS
Figure 4. Setting the Auxiliary Monitor
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Quad Voltage P Supervisory Circuit in SOT Package MAX6339
Selector Guide
NOMINAL INPUT VOLTAGE PART IN1 (V) 5 5 5 5 5 5 5 5 5 5 Adj* Adj* 5 5 5 5 IN2 (V) 3.3 3.3 3.3 3.3 3.0 3.0 3.0 3.0 3.3 3.3 3.3 3.3 3.0 3.0 3.3 3.3 IN3 (V) 2.5 2.5 1.8 1.8 2.5 2.5 1.8 1.8 2.5 2.5 2.5 2.5 Adj* Adj* Adj* Adj* IN4 (V) Adj* Adj* Adj* Adj* Adj* Adj* Adj* Adj* 1.8 1.8 Adj* Adj* -5 -5 -5 -5 SUPPLY TOLERANCE (%) 10 5 10 5 10 5 10 5 10 5 10 5 10 5 10 5 TOP MARK AAJU AAJV AAJW AAJX AAJY AAJZ AAKA AAKB AAKC AAKD AAKE AAKF AAKG AAKH AAKI AAKJ
MAX6339AUT MAX6339BUT MAX6339CUT MAX6339DUT MAX6339EUT MAX6339FUT MAX6339GUT MAX6339HUT MAX6339IUT MAX6339JUT MAX6339KUT MAX6339LUT MAX6339MUT MAX6339NUT MAX6339OUT MAX6339PUT
*Adjustable voltage based on +1.23V internal threshold. External threshold voltage can be set using an external resistor-divider. Normal input voltages for 1.8V and 2.5V are specified for 10% tolerances.
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Quad Voltage P Supervisory Circuit in SOT Package
Package Information
6LSOT.EPS
MAX6339
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) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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