Quad Voltage Monitor µMAX Package MAX6338 quad voltage monitor ca

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Quad Voltage Monitor µMAX Package MAX6338 quad voltage monitor ca

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19-1695; 7/01
Quad Voltage Monitor µMAX Package
MAX6338 quad voltage monitor capable monitoring four supplies without external components. variety factory-trimmed threshold voltages supply tolerances available optimize MAX6338 specific applications. selection includes input options monitoring +5.0V, +3.3V, +3.0V, +2.5V, +1.8V, -5.0V voltages. additional high-input impedance comparator option used adjustable voltage monitor, general-purpose comparator, digital level translator. Each monitored voltages available with trip thresholds support power-supply tolerances either below nominal voltage. internal bandgap reference ensures accurate trip thresholds across extended (-40°C +85°C) operating temperature range. MAX6338 consumes 25µA (typ) supply current operates with supply voltages from +2.5V +5.5V. internal undervoltage lockout circuit forces four digital outputs when drops below minimum operating voltage. four digital outputs have weak internal pull-ups VCC, allowing wire-ORed connection. Each input threshold voltage independent output. MAX6338 available 10-pin µMAX package.
Features
Monitors Four Voltages (Factory Programmed User Adjustable) +5.0V, +3.3V, +3.0V, +2.5V, +1.8V, -5.0V (nominal) User-Adjustable Settings 25µA Supply Current Four Independent, Open-Drain, Active-Low Outputs +2.5V +5.5V Supply Voltage Range Guaranteed from -40°C +85°C External Components Required Small 10-Pin µMAX Package
MAX6338
Ordering Information
PART MAX6338_UB* TEMP. RANGE -40°C +85°C PIN-PACKAGE µMAX
*Insert desired letter from Selector Guide into blank complete part number.
Selector Guide
NOMINAL INPUT VOLTAGE PART Adj* Adj* Adj* Adj* Adj* Adj* Adj* Adj* Adj* Adj* Adj* Adj* Adj* Adj* Adj* Adj* SUPPLY TOLERANCE
_Applications
Telecommunications High-End Printers Desktop Notebook Computers Data Storage Equipment Networking Equipment Industrial Equipment Set-Top Boxes
MAX6338AUB MAX6338BUB MAX6338CUB MAX6338DUB MAX6338EUB MAX6338FUB MAX6338GUB
Configuration
VIEW
OUT1 OUT2 OUT3 OUT4
MAX6338HUB MAX6338IUB MAX6338JUB MAX6338KUB MAX6338LUB MAX6338MUB MAX6338NUB MAX6338OUB MAX6338PUB
MAX6338
µMAX
*Adjustable voltage based +1.23V internal threshold. External threshold voltage using external resistor-divider. Nominal input voltages 1.8V 2.5V specified tolerances
Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
Quad Voltage Monitor µMAX Package MAX6338
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect GND) .-0.3V Output Voltages (OUT_) .-0.3V Input Voltages (IN_) (except -5V).-0.3V Input Voltage (-5V input) .-6V +0.3V Continuous OUT_ Current.20mA Continuous Power Dissipation +70°C) 10-pin µMAX (derate 5.6mW/°C above +70°C) .444mW Operating Temperature Range .-40°C +85°C Storage Temperature Range .-65°C +150°C Junction Temperature .+150°C Lead Temperature (soldering, 10s) .+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC +2.5V +5.5V, -40°C +85°C, unless otherwise noted. Typical values +25°C +5V, unless otherwise noted.) (Note
PARAMETER Supply Voltage Range Supply Current SYMBOL VIN_ input threshold voltage (+1.8V, +2.5V, +3.0V, +3.3V, +5.0V) Input Current (Note IIN_ VIN_ (input threshold voltage =1.23V) VIN_ (input threshold voltage -5V) +5.0V (-5%) Threshold +5.0V (-10%) Threshold +3.3V (-5%) Threshold +3.3V (-10%) Threshold +3.0V (-5%) Threshold +3.0V (-10%) Threshold +2.5V (-10%) Threshold +1.8V (-10%) Threshold -5.0V (+5%) Threshold -5.0V (+10%) Threshold Adjustable Threshold Threshold Voltage Temperature Coefficient Threshold Hysteresis Propagation Delay VTHYST VIN_ (VTH 50mV) (VTH 50mV) ISINK Output Voltage Output High Voltage 2.5V, ISINK 1.2mA ISINK 50µA 2.5V, ISOURCE (minimum) decreasing decreasing decreasing decreasing decreasing decreasing decreasing decreasing increasing increasing decreasing 4.25 2.85 2.55 2.13 1.53 -4.75 -4.5 1.20 -0.1 4.63 4.38 3.08 2.93 2.78 2.63 2.19 1.58 -4.63 -4.38 1.23 CONDITIONS +2.5 +5.5 +0.1 4.75 4.50 3.15 3.00 2.85 2.70 2.25 1.62 -4.50 -4.25 1.26 ppm/°C UNITS
Note 100% production tested +25°C. Overtemperature limits guaranteed design. Note Guaranteed design.
Quad Voltage Monitor µMAX Package
Typical Operating Characteristics
(VCC +5V, +25°C, unless otherwise noted.)
MAX6338
SUPPLY CURRENT SUPPLY VOLTAGE
MAX6338-01
NORMALIZED THRESHOLD ERROR SUPPLY VOLTAGE
MAX6338-02
NORMALIZE THRESHOLD TEMPERATURE
NORMALIZED THRESHOLD
MAX6338-03
SUPPLY CURRENT (µA) -40°C +85°C +25°C
0.10 NORMALIZED THRESHOLD ERROR 0.08 0.06 0.04 0.02 -0.02 -0.04 -0.06 NORMALIZED
-0.1
-0.2
-0.3 SUPPLY VOLTAGE TEMPERATURE (°C)
SUPPLY VOLTAGE
OUTPUT VOLTAGE SINK CURRENT
MAX6338-04
PROPAGATION DELAY (WITH 100mV OVERDRIVE)
MAX6338-05
PROPAGATION DELAY (WITH 20mV OVERDRIVE)
MAX6338-06
OUTPUT VOLTAGE +85°C -40°C +25°C
50mV/div
20mV/div
OUT_ 2V/div
OUT_ 2V/div
10µs/div
10µs/div
SINK CURRENT (mA)
Quad Voltage Monitor µMAX Package MAX6338
Description
NAME OUT4 OUT3 OUT2 OUT1 FUNCTION Input Voltage Selector Guide monitored voltages. Input Voltage Selector Guide monitored voltages. Input Voltage Selector Guide monitored voltages. Input Voltage Selector Guide monitored voltages. Ground Output OUT4 goes when VIN4 falls below absolute threshold. OUT4 open drain with 10µA internal pullup VCC. Output OUT3 goes when VIN3 falls below absolute threshold. OUT3 open drain with 10µA internal pullup VCC. Output OUT2 goes when VIN2 falls below absolute threshold. OUT2 open drain with 10µA internal pullup VCC. Output OUT1 goes when VIN1 falls below absolute threshold. OUT1 open drain with 10µA internal pullup VCC. Power Supply. Connect +2.5V +5.5V supply. undervoltage lockout circuit forces OUT_ pins when drops below 2.5V.
_Detailed Description
MAX6338 low-power (25µA), quad voltage monitor designed multivoltage systems. Preset voltage options +5.0V, +3.3V, +3.0V, +2.5V, +1.8V, -5.0V make these quad monitors ideal applications such telecommunications, desktop notebook computers, high-end printers, data storage equipment, networking equipment. MAX6338 internally trimmed threshold that minimizes eliminates need external components. four open-drain outputs have weak (10µA) internal pullups VCC, allowing them interface easily with other logic devices. MAX6338 monitor power supplies with either tolerance specifications, depending selected version. additional high-input-impedance comparator option used adjustable voltage monitor, general-purpose comparator, digital level translator. weak internal pullups overdriven external pullups voltage from +5.5V. Internal circuitry prevents current flow from external pullup voltage VCC. outputs wire-ORed single "power good" signal. MAX6338 either auxiliary inputs three factory-programmed threshold voltages, four fixed voltages. inverting input compara4
tors connected 1.23V bandgap reference positive voltages. noninverting terminals accessible through internal resistive voltage-dividers with preset factory threshold voltages. case auxiliary (AUX) input, positive terminal comparator accessible directly setting threshold monitored voltage. When inputs (IN1-IN4) higher than threshold level, output high. output goes input drops below threshold voltage monitor. undervoltage lockout circuitry remains active outputs remain with down (Figure
Applications Information
Hysteresis
When voltage comparator input near voltage other input, ambient noise generally causes comparator output oscillate. most common eliminate this problem through hysteresis. When comparator input voltages equal, hysteresis causes comparator input voltage move quickly past other, thus taking input region where oscillation occurs. Standard comparators require hysteresis added through external resistors. external resistive network usually provides positive feedback input order cause jump threshold voltage when
Quad Voltage Monitor µMAX Package MAX6338
MAX6338M/N/O/P
OUT1
OUT2
IN3* (AUX)*
OUT3
(-5V)
OUT4
VREF
REFERENCE UNDERVOLTAGE LOCKOUT
*SEE AUXILIARY INPUT SECTION.
Figure MAX6338 Functional Diagram
Quad Voltage Monitor µMAX Package MAX6338
0.1µF* OUT1 OUT2 OUT3 MAX6338 (+5V)
OUT1 MAX6338
OUT2
OUT3
OUT4
OUT4
*OPTIONAL
Figure Quad Undervoltage Detector with Indicators
Figure Graph Monitoring
VTH1 VREF
MAX6338HUB OUT1 OUT1
VREF 1.23V
VTH1
OUT2 OUT1
INPUT VTH4 VREF OUT4 OUT3 OUT4 VTH4
Figure Window Detection
Figure Output Response Window Detector Circuit
output toggles direction other. These resistors required when using MAX6338 because hysteresis built into device. MAX6338 hysteresis typically 0.3%.
MAX6338 also used applications such system supervisory monitoring, multivoltage level detection, graph monitoring (Figure
Window Detection
window detector circuit uses auxiliary inputs configuration such shown Figure External resistors R1-R4 threshold voltages (VTH1 VTH4) window detector circuit. Window width (VTH) difference between threshold voltages (Figure
Undervoltage Detection Circuit
open-drain outputs MAX6338 configured detect undervoltage condition. Figure shows configuration where comparator output indicates undervoltage condition, which turn causes light.
Quad Voltage Monitor µMAX Package
VINTH
Unused Inputs
unused inputs (except auxiliary) internally connected ground through lower resistors threshold-setting resistor pairs. auxiliary (AUX) input, however, must connected either ground unused.
MAX6338
Power-Supply Bypassing Grounding
MAX6338 operates from single +2.5V +5.5V supply. noisy applications, connect 0.1µF capacitor supply voltage line close bypassing.
VREF 1.23V
INTH V1.23
Chip Information
TRANSISTOR COUNT: PROCESS: BiCMOS
Figure Setting Auxiliary Monitor
Auxiliary Input
adjustable voltage monitor comparable internal reference 1.23V shown Figure desired trip level monitored supply, INTH choose: [(VINTH 1.23) 1)]. example, voltage detection 4.5V (assume 100k), 265k.
Typical Operating Circuit
+2.5V +5.5V (MAY MONITORED VOLTAGES)
SUPPLIES MONITORED MAX6338 OUT1 OUT2 OUT3 OUT4 SYSTEM LOGIC
Quad Voltage Monitor µMAX Package MAX6338
Package Information
10LUMAX.EPS Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2001 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

Quad Voltage Monitor µMAX Package MAX6338 quad voltage monitor ca

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