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MAX6339IUT-T-MAX6339KUT-T
Quad voltage Mp supervisory circuit
General DescriptionThe MAX6339 is a precision quad voltage monitor with
microprocessor (µP) 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 avail-
able to accommodate different supply voltages and toler-
ances with minimal external component requirements.
The selection includes internally fixed options for monitor-
ing +5.0V, +3.3V, +3.0V, +2.5V, +1.8V, and -5.0V sup-
plies 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 exter-
nal resistor-divider network).
The quad monitor provides a single active-low reset out-
put that is asserted when any monitored input is below its
associated threshold. The output is open drain with a
weak internal pull-up (10µA) 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 pack-
age and operates over the extended (-40°C to +85°C)
temperature range.
________________________ApplicationsTelecommunications
High-End Printers
Desktop and Network Computers
Data Storage Equipment
Networking Equipment
Industrial Equipment
Set-Top Boxes
FeaturesMonitors Four Power-Supply VoltagesPrecision Factory-Set Reset Threshold Options
for +5.0V, +3.3V, +3.0, +2.5V, +1.8V, and -5.0V
SuppliesUser-Adjustable Voltage Monitoring Threshold
OptionsLow 55µA Supply CurrentOpen-Drain RESETOutput with 10µA Internal
Pullup140ms (min) Reset Timeout PeriodRESET
Valid to IN1 = 1V or IN2 = 1VImmune to Short Monitored Supply TransientsNo External Components RequiredGuaranteed from -40°C to +85°CSmall 6-Pin SOT23 Package
MAX6339
Quad Voltage µP Supervisory Circuit
in SOT Package19-1756; Rev 2; 10/01
Ordering Information*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.
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
MAX6339
Quad Voltage µP Supervisory Circuit
in SOT Package
ABSOLUTE MAXIMUM RATINGSStresses 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)
Input Voltages (IN_ ) (except -5V)............................-0.3V to +6V
RESET.......................................................................-0.3V to +6V
Input Voltage (-5V Input)..........................................-6V to +0.3V
Continuous RESETCurrent.................................................20mA
Continuous Power Dissipation (TA= +70°C)
6-pin SOT23 (derate 8.7mW/°C above +70°C).........695.7mW
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
ELECTRICAL CHARACTERISTICS(VIN2= +1V to +5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VIN2= +3.0V to +3.3V, TA= +25°C, unless
MAX6339
Quad Voltage µP Supervisory Circuit
in SOT Package
ELECTRICAL CHARACTERISTICS (continued)(VIN2= +1V to +5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VIN2= +3.0V to +3.3V, TA= +25°C, unless
otherwise noted.) (Note 1)
Note 1:100% production tested at TA= +25°C. Limits over temperature guaranteed by design.
Note 2:The device is powered from input IN2.
Note 3:The RESEToutput is guaranteed to be in the correct state for IN1 or IN2 down to 1V.
Note 4:Monitored voltage (+3.3V, +3.0V) is also the device power supply. Supply current splits as follows: 25µA for the resistor-
divider (for the monitored voltage) and 30µA for other circuits.
Typical Operating Characteristics(VIN2= +3.0V, TA= +25°C)
Pin Description
MAX6339
Quad Voltage µP Supervisory Circuit
in SOT Package
Typical Operating Characteristics (continued)(VIN2= +3.0V, TA= +25°C)
MAX6339
Quad Voltage µP Supervisory Circuit
in SOT Package
Detailed DescriptionThe MAX6339 is a very small, low-power, quad voltage
µP 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 fac-
tory-fixed reset threshold options. The resistor networks
scale the specified IN_ reset voltages to match the
internal bandgap reference/comparator voltage. User-
adjustable threshold options bypass the internal resis-
tor networks and connect directly to one of the
comparator inputs (an external resistor-divider network
is required for threshold matching). All threshold volt-
age 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 hystere-
sis 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 when an input sits at its specified reset volt-
age. The MAX6339 is also designed to ignore short IN_
transients. See Typical Operating Characteristicsfor a
glitch immunity graph.
Applications Information
Reset OutputThe MAX6339 RESEToutput 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 moni-
tored IN2 supply (10µA 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
threshold, the reset output is asserted and guaranteed
to remain low while either IN1 or IN2 is above +1.0V.
User-Adjustable ThresholdsThe MAX6339 offers several monitor options with user-
adjustable 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 ±0.1µA on its adjustable inputs, resistor values up to
100kΩcan be used for R2 with <1% error.
Unused InputsIf 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.
Negative Voltage Monitoring Beyond -5VThe 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 cur-
rent should ≥2mA (for IIN4= 20µA max). Set R2 =
2.5kΩ. Calculate R1 based on the desired VIN_reset
threshold voltage, using the following formula:
R1 = R2 ✕[(VINTH/ VTH) -1]
where R2 ≤2.49kΩ, VINTH= desired threshold voltage
and VTHis the internal threshold voltage.
MAX6339
Quad Voltage µP Supervisory Circuit
in SOT Package Figure 1. MAX6339 Functional Diagram
