General Description
The 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 VCC drops 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.
________________________Applications
Telecommunications
High-End Printers
Desktop and Notebook Computers
Data Storage Equipment
Networking Equipment
Industrial Equipment
Set-Top Boxes
Features
♦Monitors Four Voltages (Factory Programmed or
User Adjustable)
+5.0V, +3.3V, +3.0V, +2.5V, +1.8V, -5.0V
(nominal) or User-Adjustable Settings
♦Low 25µA Supply Current
♦Four Independent, Open-Drain, Active-Low
Outputs
♦+2.5V to +5.5V Supply Voltage Range
♦Guaranteed from -40°C to +85°C
♦No External Components Required
♦Small 10-Pin µMAX Package
MAX6338
Quad Voltage Monitor in µMAX Package
________________________________________________________________ Maxim Integrated Products 1
1
2
3
4
5
10
9
8
7
6
VCC
OUT1
OUT2
OUT3IN4
IN3
IN2
IN1
MAX6338
µMAX
TOP VIEW
OUT4GND
Pin Configuration
NOMINAL INPUT VOLTAGE
PART
IN1
(V)
IN2
(V)
IN3
(V)
IN4
(V)
SUPPLY
TOLERANCE
(%)
MAX6338AUB
5
3.3 2.5 Adj*
10
MAX6338BUB
5
3.3 2.5† Adj*
5
MAX6338CUB
5
3.3 1.8 Adj*
10
MAX6338DUB
5
3.3 1.8† Adj*
5
MAX6338EUB
5
3.0 2.5 Adj*
10
MAX6338FUB
5
3.0 2.5† Adj*
5
MAX6338GUB
5
3.0 1.8 Adj*
10
MAX6338HUB
5
3.0 1.8† Adj*
5
MAX6338IUB
5
3.3 2.5 1.8
10
MAX6338JUB
5
3.3 2.5† 1.8†
5
MAX6338KUB
Adj* 3.3 2.5 Adj*
10
MAX6338LUB
Adj* 3.3 2.5† Adj*
5
MAX6338MUB
5
3.0 Adj*
-5 10
MAX6338NUB
5
3.0 Adj*
-5 5
MAX6338OUB
5
3.3 Adj*
-5 10
MAX6338PUB
5
3.3 Adj*
-5 5
19-1695; Rev 2; 12/05
Ordering Information
Selector Guide
PART TEMP RANGE
PIN-PACKAGE
MAX6338_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%
tolerances
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.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
MAX6338
Quad Voltage Monitor in µMAX Package
2_______________________________________________________________________________________
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
PARAMETER
SYMBOL
CONDITIONS
TYP
UNITS
Supply Voltage Range VCC
+2.5 +5.5
V
VCC = +3V 25 50
Supply Current ICC VCC = +5V 35 65 µA
VIN_ = input threshold voltage
(+1.8V, +2.5V, +3.0V, +3.3V, +5.0V) 25 40
VIN_ = 0 to VCC
(input threshold voltage =1.23V)
-0.1 +0.1
Input Current (Note 2) IIN_
VIN_ = -5V
(input threshold voltage = -5V) -10 -20
µA
+5.0V (-5%) Threshold VTH VIN decreasing 4.5
4.63 4.75
V
+5.0V (-10%) Threshold VTH VIN decreasing
4.25 4.38 4.50
V
+3.3V (-5%) Threshold VTH VIN decreasing 3.0
3.08 3.15
V
+3.3V (-10%) Threshold VTH VIN decreasing
2.85 2.93 3.00
V
+3.0V (-5%) Threshold VTH VIN decreasing 2.7
2.78 2.85
V
+3.0V (-10%) Threshold VTH VIN decreasing
2.55 2.63 2.70
V
+2.5V (-10%) Threshold VTH VIN decreasing
2.13 2.19 2.25
V
+1.8V (-10%) Threshold VTH VIN decreasing
1.53 1.58 1.62
V
-5.0V (+5%) Threshold VTH VIN increasing
-4.75 -4.63 -4.50
V
-5.0V (+10%) Threshold VTH VIN increasing
-4.5 -4.38 -4.25
V
Adjustable Threshold VTH VIN decreasing
1.20 1.23 1.26
V
Threshold Voltage Temperature
Coefficient 60
ppm/°C
Threshold Hysteresis
VTHYST
0.3 %
Propagation Delay tpd VIN_ = VTH to (VTH - 50mV) or
VTH to (VTH - 50mV) 20 µs
VCC = 5V, ISINK = 2mA 0.4
VCC = 2.5V, ISINK = 1.2mA 0.4
Output Low Voltage VOL
VCC = 1V, ISINK = 50µA 0.4
V
Output High Voltage VOH VCC > 2.5V, ISOURCE = 6µA (minimum) 0.8 x VCC V
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
_______________________________________________________________________________________ 3
10
20
15
30
25
40
35
45
2.5 3.5 4.03.0 4.5 5.0 5.5
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6338-01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
TA = +85°C
TA = +25°C
TA = -40°C
-0.06
-0.04
-0.02
0
0.02
0.04
0.06
0.08
0.10
2.5 3.53.0 4.0 4.5 5.0 5.5
NORMALIZED THRESHOLD ERROR
vs. SUPPLY VOLTAGE
MAX6338-02
SUPPLY VOLTAGE (V)
NORMALIZED THRESHOLD ERROR (%)
NORMALIZED TO +5V
-0.3
-0.2
-0.1
0
0.1
-40 20 40-20 0 60 80
NORMALIZE THRESHOLD
vs. TEMPERATURE
MAX6338-03
TEMPERATURE (°C)
NORMALIZED THRESHOLD (%)
VCC = +5V
0
0.3
0.2
0.1
0.4
0.5
0.6
04312 5678910
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 Description
The 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 VCC down to 1V (Figure 1).
Applications Information
Hysteresis
When 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
4_______________________________________________________________________________________
Pin Description
PIN
NAME
FUNCTION
1IN1 Input Voltage 1. See the Selector Guide for monitored voltages.
2IN2 Input Voltage 2. See the Selector Guide for monitored voltages.
3IN3 Input Voltage 3. See the Selector Guide for monitored voltages.
4IN4 Input Voltage 4. See the Selector Guide for monitored voltages.
5GND Ground
6OUT4 Output 4. OUT4 goes low when VIN4 falls below its absolute threshold. OUT4 is open drain with a 10µA
internal pullup to VCC.
7OUT3 Output 3. OUT3 goes low when VIN3 falls below its absolute threshold. OUT3 is open drain with a 10µA
internal pullup to VCC.
8OUT2 Output 2. OUT2 goes low when VIN2 falls below its absolute threshold. OUT2 is open drain with a 10µA
internal pullup to VCC.
9OUT1 Output 1. OUT1 goes low when VIN1 falls below its absolute threshold. OUT1 is open drain with a 10µA
internal pullup to VCC.
10 VCC Power 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
_______________________________________________________________________________________ 5
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
MAX6338
output 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 Circuit
The 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 VCC bar graph monitoring (Figure 3).
Window Detection
A 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
(VTH1 and VTH4) of the window detector circuit. Window
width (∆VTH) is the difference between the threshold
voltages (Figure 5).
Quad Voltage Monitor in µMAX Package
6_______________________________________________________________________________________
IN1
VCC
GND
IN2
IN3
IN4
OUT1
0.1µF*
OUT2
OUT3
OUT4
+5V
*OPTIONAL
MAX6338
V1
V2
V3
V4
D3
D1
D2
D4
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
R2
R4
R1
R3
VTH1 = (1 + ) V REF
R2
R1
VTH4 = (1 + ) V REF
R4
R3
V REF = 1.23V OUT1
OUT4
OUT
VTH1
VTH4
∆VTH
Figure 2. Quad Undervoltage Detector with LED Indicators Figure 3. VCC Bar Graph Monitoring
Figure 4. Window Detection Figure 5. Output Response of Window Detector Circuit
Auxiliary Input
The adjustable voltage monitor is comparable to an
internal reference of 1.23V as shown in Figure 6. To set
the desired trip level of monitored supply, VINTH,
choose: R1 = R2 [(VINTH / 1.23) - 1)]. For example, for a
voltage detection at 4.5V (assume R2 = 100kΩ), R1 =
265kΩ.
Unused Inputs
The unused inputs (except the auxiliary) are internally
connected to ground through the lower resistors of the
threshold-setting resistor pairs. The auxiliary (AUX)
input, however, must be connected to either ground or
VCC if unused.
Power-Supply Bypassing and Grounding
The MAX6338 operates from a single +2.5V to +5.5V
supply. In noisy applications, connect a 0.1µF capaci-
tor on the supply voltage line close to VCC pin for
bypassing.
Chip Information
TRANSISTOR COUNT: 620
PROCESS: BiCMOS
MAX6338
Quad Voltage Monitor in µMAX Package
_______________________________________________________________________________________ 7
Figure 6. Setting the Auxiliary Monitor
Typical Operating Circuit
R1 = R2 ( - 1)
VINTH
1.23
VREF = 1.23V
R2
R1
VINTH
MAX6338
IN1
IN2
IN3
IN4
OUT1
VCC
OUT2
OUT3
OUT4
GND
SYSTEM
LOGIC
+2.5V TO +5.5V
(MAY BE ONE OF THE MONITORED VOLTAGES)
SUPPLIES
TO BE
MONITORED µP
MAX6338
Quad Voltage Monitor in µMAX 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.
8_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
©2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.
10LUMAX.EPS
PACKAGE OUTLINE, 10L uMAX/uSOP
1
1
21-0061
REV.DOCUMENT CONTROL NO.APPROVAL
PROPRIETARY INFORMATION
TITLE:
TOP VIEW
FRONT VIEW
1
0.498 REF
0.0196 REF
S
6°
SIDE VIEW
α
BOTTOM VIEW
0° 0° 6°
0.037 REF
0.0078
MAX
0.006
0.043
0.118
0.120
0.199
0.0275
0.118
0.0106
0.120
0.0197 BSC
INCHES
1
10
L1
0.0035
0.007
e
c
b
0.187
0.0157
0.114
H
L
E2
DIM
0.116
0.114
0.116
0.002
D2
E1
A1
D1
MIN
-A
0.940 REF
0.500 BSC
0.090
0.177
4.75
2.89
0.40
0.200
0.270
5.05
0.70
3.00
MILLIMETERS
0.05
2.89
2.95
2.95
-
MIN
3.00
3.05
0.15
3.05
MAX
1.10
10
0.6±0.1
0.6±0.1
Ø0.50±0.1
H
4X S
e
D2
D1
b
A2 A
E2
E1 L
L1
c
α
GAGE PLANE
A2 0.030 0.037 0.75 0.95
A1
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.)