MAX6338BUB+ ,Quad Voltage Monitor with Four Outputs in µMax PackageMAX633819-1695; Rev 2; 12/05Quad Voltage Monitor in µMAX Package
MAX6338BUB+ ,Quad Voltage Monitor with Four Outputs in µMax Packageapplications. The selection♦ Low 25µA Supply Currentincludes input options for monitoring +5.0V, +3 ..
MAX6338CUB ,Quad Voltage Monitor in レMAX PackageApplicationsTOLERANCE(V) (V) (V) (V)(%)TelecommunicationsMAX6338AUB 5 3.3 2.5 Adj* 10High-End Print ..
MAX6338CUB ,Quad Voltage Monitor in レMAX Packageapplications. The selection Low 25µA Supply Currentincludes input options for monitoring +5.0V, +3 ..
MAX6338DUB ,Quad Voltage Monitor in レMAX PackageMAX633819-1695; Rev 1; 7/01Quad Voltage Monitor in µMAX Package
MAX6338DUB ,Quad Voltage Monitor in レMAX PackageFeaturesThe MAX6338 quad voltage monitor is capable of moni- Monitors Four Voltages (Factory Progr ..
MB15E03 ,Single Serial Input PLL Frequency Synthesizer On-Chip 1.2 GHz Prescaler FUJITSU SEMICONDUCTORDS04-21340-2EDATA SHEETASSPSingle Serial InputPLL ..
MB15E03L ,Single Serial Input PLL Frequency Synthesizer On-Chip 1.2 GHz Prescaler FUJITSU SEMICONDUCTORDS04-21352-1EDATA SHEETASSPSingle Serial InputPLL ..
MB15E03LPV ,Single Serial Input PLL Frequency Synthesizer On-Chip 1.2 GHz Prescaler FUJITSU SEMICONDUCTORDS04-21352-1EDATA SHEETASSPSingle Serial InputPLL ..
MB15E05 , ASSP Single Serial Input PLL Frequency Synthesizer On-Chip 2.0GHz Prescaler
MB15E05 , ASSP Single Serial Input PLL Frequency Synthesizer On-Chip 2.0GHz Prescaler
MB15E05 , ASSP Single Serial Input PLL Frequency Synthesizer On-Chip 2.0GHz Prescaler
MAX6338AUB+-MAX6338BUB+-MAX6338DUB+-MAX6338DUB+T-MAX6338JUB+-MAX6338KUB+-MAX6338LUB+-MAX6338LUB+T-MAX6338MUB+-MAX6338OUB+-MAX6338PUB+
Quad Voltage Monitor with Four Outputs in µMax Package
General DescriptionThe MAX6338 quad voltage monitor is capable of moni-
toring up to four supplies without any external compo-
nents. A variety of factory-trimmed threshold voltages
and supply tolerances are available to optimize the
MAX6338 for specific applications. The selection
includes input options for monitoring +5.0V, +3.3V,
+3.0V, +2.5V, +1.8V, and -5.0V voltages. An additional
high-input impedance comparator option can be used
as an adjustable voltage monitor, general-purpose com-
parator, or digital level translator.
Each of the monitored voltages is available with trip
thresholds to support power-supply tolerances of either
5% or 10% below the nominal voltage. An internal
bandgap reference ensures accurate trip thresholds
across the extended (-40°C to +85°C) operating temper-
ature range.
The MAX6338 consumes 25µA (typ) supply current and
operates with supply voltages from +2.5V to +5.5V. An
internal undervoltage lockout circuit forces all four digital
outputs low when VCCdrops below the minimum operat-
ing voltage. The four digital outputs all have weak inter-
nal pull-ups to VCC, allowing wire-ORed connection.
Each input threshold voltage has an independent output.
The MAX6338 is available in a 10-pin µMAX®package.
________________________ApplicationsTelecommunications
High-End Printers
Desktop and Notebook Computers
Data Storage Equipment
Networking Equipment
Industrial Equipment
Set-Top Boxes
FeaturesMonitors Four Voltages (Factory Programmed or
User Adjustable)
+5.0V, +3.3V, +3.0V, +2.5V, +1.8V, -5.0V
(nominal) or User-Adjustable SettingsLow 25µA Supply CurrentFour Independent, Open-Drain, Active-Low
Outputs +2.5V to +5.5V Supply Voltage RangeGuaranteed from -40°C to +85°CNo External Components RequiredSmall 10-Pin µMAX Package
MAX6338
Quad Voltage Monitor in µMAX Package VCC
OUT1
OUT2
OUT3IN4
IN3
IN2
IN1
MAX6338
μMAX
TOP VIEW
OUT4GND
Pin Configuration
NOMINAL INPUT VOLTAGE
PARTIN1
(V)
IN2
(V)
IN3
(V)
IN4
(V)
SUPPLY
TOLERANCE
(%)MAX6338AUB53.32.5Adj*10
MAX6338BUB53.32.5†Adj*5
MAX6338CUB53.31.8Adj*10
MAX6338DUB53.31.8†Adj*5
MAX6338EUB53.02.5Adj*10
MAX6338FUB53.02.5†Adj*5
MAX6338GUB53.01.8Adj*10
MAX6338HUB53.01.8†Adj*5
MAX6338IUB53.32.51.810
MAX6338JUB53.32.5†1.8†5
MAX6338KUBAdj*3.32.5Adj*10
MAX6338LUBAdj*3.32.5†Adj*5
MAX6338MUB53.0Adj*-510
MAX6338NUB53.0Adj*-55
MAX6338OUB53.3Adj*-510
MAX6338PUB53.3Adj*-55
19-1695; Rev 2; 12/05
Ordering Information
Selector Guide
PARTTEMP RANGEPIN-PACKAGEMAX6338_UB*-40°C to +85°C10 µMAX
*Insert the desired letter from the Selector Guide into the blank
to complete the part number.
Devices are available in both leaded and lead-free packaging.
Specify lead free by adding the + symbol at the end of the part
number when ordering.
*Adjustable voltage based on +1.23V internal threshold. External
threshold voltage can be set using an external resistor-divider.Nominal input voltages for 1.8V and 2.5V are specified for 10%
µMAX is a registered trademark of Maxim Integrated Products, Inc.
MAX6338
Quad Voltage Monitor in µMAX Package
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= +2.5V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C and VCC= +5V, unless other-
wise noted.) (Note 1)
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.
Terminal Voltage (with respect to GND)
VCC......................................................................-0.3V to +6V
Output Voltages (OUT_)...........................................-0.3V to +6V
Input Voltages (IN_) (except -5V).............................-0.3V to +6V
Input Voltage (-5V input)..........................................-6V to +0.3V
Continuous OUT_ Current...................................................20mA
Continuous Power Dissipation (TA= +70°C)
10-pin µMAX (derate 5.6mW/°C above +70°C)..........444mW
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
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSupply Voltage RangeVCC+2.5+5.5V
VCC = +3V2550Supply CurrentICCVCC = +5V3565µA
VIN_ = input threshold voltage
(+1.8V, +2.5V, +3.0V, +3.3V, +5.0V)2540
VIN_ = 0 to VCC
(input threshold voltage =1.23V)-0.1+0.1Input Current (Note 2)IIN_
VIN_ = -5V
(input threshold voltage = -5V)-10-20
+5.0V (-5%) ThresholdVTHVIN decreasing4.54.634.75V
+5.0V (-10%) ThresholdVTHVIN decreasing4.254.384.50V
+3.3V (-5%) ThresholdVTHVIN decreasing3.03.083.15V
+3.3V (-10%) ThresholdVTHVIN decreasing2.852.933.00V
+3.0V (-5%) ThresholdVTHVIN decreasing2.72.782.85V
+3.0V (-10%) ThresholdVTHVIN decreasing2.552.632.70V
+2.5V (-10%) ThresholdVTHVIN decreasing2.132.192.25V
+1.8V (-10%) ThresholdVTHVIN decreasing1.531.581.62V
-5.0V (+5%) ThresholdVTHVIN increasing-4.75-4.63-4.50V
-5.0V (+10%) ThresholdVTHVIN increasing-4.5-4.38-4.25V
Adjustable ThresholdVTHVIN decreasing1.201.231.26V
Threshold Voltage Temperature
Coefficient60ppm/°C
Threshold HysteresisVTHYST0.3%
Propagation DelaytpdVIN_ = VTH to (VTH - 50mV) or
VTH to (VTH - 50mV)20µs
VCC = 5V, ISINK = 2mA0.4
VCC = 2.5V, ISINK = 1.2mA0.4Output Low VoltageVOL
VCC = 1V, ISINK = 50µA0.4
Output High VoltageVOHVCC > 2.5V, ISOURCE = 6µA (minimum)0.8 x VCCV
Note 1:100% production tested at +25°C. Overtemperature limits guaranteed by design.
Note 2:Guaranteed by design.
MAX6338
Quad Voltage Monitor in µMAX Package SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6338-01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
TA = +85°C
TA = +25°C
TA = -40°C
NORMALIZED THRESHOLD ERROR
vs. SUPPLY VOLTAGE
MAX6338-02
SUPPLY VOLTAGE (V)
NORMALIZED THRESHOLD ERROR (%)NORMALIZED TO +5V
NORMALIZE THRESHOLD
vs. TEMPERATURE
MAX6338-03
TEMPERATURE (°C)
NORMALIZED THRESHOLD (%)
VCC = +5V
OUTPUT-VOLTAGE LOW
vs. SINK CURRENT
MAX6338-04
SINK CURRENT (mA)
OUTPUT-VOLTAGE LOW (V)
TA = +25°C
VCC = 5V
TA = -40°C
TA = +85°C
PROPAGATION DELAY
(WITH 100mV OVERDRIVE)MAX6338-05
10µs/div
IN_
50mV/div
OUT_
2V/div
PROPAGATION DELAY
(WITH 20mV OVERDRIVE)MAX6338-06
10μs/div
IN_
20mV/div
OUT_
2V/div
Typical Operating Characteristics(VCC= +5V, TA= +25°C, unless otherwise noted.)
_______________Detailed DescriptionThe MAX6338 is a low-power (25µA), quad voltage
monitor designed for multivoltage systems. Preset volt-
age options for +5.0V, +3.3V, +3.0V, +2.5V, +1.8V, and
-5.0V make these quad monitors ideal for applications
such as telecommunications, desktop and notebook
computers, high-end printers, data storage equipment,
and networking equipment.
The MAX6338 has an internally trimmed threshold that
minimizes or eliminates the need for external compo-
nents. The four open-drain outputs have weak (10µA)
internal pullups to VCC, allowing them to interface easily
with other logic devices. The MAX6338 can monitor
power supplies with either 5% or 10% tolerance specifi-
cations, depending on the selected version. An addi-
tional high-input-impedance comparator option can be
used as an adjustable voltage monitor, general-pur-
pose comparator, or digital level translator.
The weak internal pullups can be overdriven by external
pullups to any voltage from 0 to +5.5V. Internal circuitry
prevents current flow from the external pullup voltage to
VCC. The outputs can be wire-ORed for a single “power
good” signal.
The MAX6338 has either one or two auxiliary inputs and
two or three factory-programmed threshold voltages, or
four fixed voltages. The inverting input of all compara-
tors is connected to a 1.23V bandgap reference for all
positive voltages. The noninverting terminals are acces-
sible through internal resistive voltage-dividers with
preset factory threshold voltages. In the case of auxil-
iary (AUX) input, the positive terminal of the comparator
is accessible directly for setting the threshold for the
monitored voltage.
When any of the inputs (IN1–IN4) are higher than the
threshold level, the output is high. The output goes low
as the input drops below the threshold voltage monitor.
The undervoltage lockout circuitry remains active and
the outputs remain low with VCCdown to 1V (Figure 1).
Applications Information
HysteresisWhen the voltage on one comparator input is at or near
the voltage on the other input, ambient noise generally
causes the comparator output to oscillate. The most
common way to eliminate this problem is through hys-
teresis. When the two comparator input voltages are
equal, hysteresis causes one comparator input voltage
to move quickly past the other, thus taking the input out
of the region where oscillation occurs. Standard com-
parators require hysteresis to be added through the
use of external resistors. The external resistive network
usually provides a positive feedback to the input in
order to cause a jump in the threshold voltage when
MAX6338
Quad Voltage Monitor in µMAX Package
Pin Description
PINNAMEFUNCTIONIN1Input Voltage 1. See the Selector Guide for monitored voltages.IN2Input Voltage 2. See the Selector Guide for monitored voltages.IN3Input Voltage 3. See the Selector Guide for monitored voltages.IN4Input Voltage 4. See the Selector Guide for monitored voltages.GNDGroundOUT4Output 4. OUT4 goes low when VIN4 falls below its absolute threshold. OUT4 is open drain with a 10µA
internal pullup to VCC.OUT3Output 3. OUT3 goes low when VIN3 falls below its absolute threshold. OUT3 is open drain with a 10µA
internal pullup to VCC.OUT2Output 2. OUT2 goes low when VIN2 falls below its absolute threshold. OUT2 is open drain with a 10µA
internal pullup to VCC.OUT1Output 1. OUT1 goes low when VIN1 falls below its absolute threshold. OUT1 is open drain with a 10µA
internal pullup to VCC.VCCPower Supply. Connect VCC to a +2.5V to +5.5V supply. An undervoltage lockout circuit forces all OUT_
pins low when VCC drops below 2.5V.
MAX6338
Quad Voltage Monitor in µMAX Package IN1
IN2
IN3*
(AUX)*
IN4
(-5V)
VCC
VCC
VCC
VCC
OUT1
OUT2
OUT3
OUT4
REFERENCE
UNDERVOLTAGE LOCKOUT
VREF
VCC
*SEE AUXILIARY INPUT SECTION.
MAX6338M/N/O/P
Figure 1. Functional Diagram
MAX6338output toggles in one direction or the other. These
resistors are not required when using the MAX6338
because hysteresis is built into the device. MAX6338
hysteresis is typically 0.3%.
Undervoltage Detection CircuitThe open-drain outputs of the MAX6338 can be config-
ured to detect an undervoltage condition. Figure 2
shows a configuration where a low at a comparator out-
put indicates an undervoltage condition, which in turn
causes an LED to light.
The MAX6338 can also be used in applications such as
system supervisory monitoring, multivoltage level
detection, and VCCbar graph monitoring (Figure 3).
Window DetectionA window detector circuit uses two auxiliary inputs in a
configuration such as the one shown in Figure 4.
External resistors R1–R4 set the two threshold voltages
(VTH1and VTH4) of the window detector circuit. Window
width (∆VTH) is the difference between the threshold
voltages (Figure 5).
Quad Voltage Monitor in µMAX Package IN1
VCC
GND
IN2
IN3
IN4
OUT1
0.1μF*
OUT2
OUT3
OUT4
+5V
*OPTIONAL
MAX6338
IN1
VCC
GND
IN2
IN3
IN4
OUT1
OUT2
OUT3
OUT4
VIN (+5V)
+5V
MAX6338
IN1
VCC
GND
IN2
IN3
IN4
OUT1
OUT2
OUT3
OUT4
+5V
MAX6338HUB
OUT1
INPUT
VTH1 = (1 + ) VREFR2
VTH4 = (1 + ) VREFR4
VREF = 1.23VOUT1
OUT4
OUT
VTH1
VTH4
∆VTH
Figure 2. Quad Undervoltage Detector with LEDIndicatorsFigure 3. VCCBar Graph Monitoring
Figure 4. Window DetectionFigure 5. Output Response of Window Detector Circuit
