19-1756; Rev 3; 12/05
Quad Voltage µP Supervisory Circuit
in SOT Package
General Description
Features
The 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.
♦ Monitors Four Power-Supply Voltages
♦ Precision Factory-Set Reset Threshold Options
for +5.0V, +3.3V, +3.0, +2.5V, +1.8V, and -5.0V
Supplies
♦ User-Adjustable Voltage Monitoring Threshold
Options
♦ Low 55µA Supply Current
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).
♦ Open-Drain RESET Output with 10µA Internal
Pullup
♦ 140ms (min) Reset Timeout Period
♦ RESET Valid to IN1 = 1V or IN2 = 1V
♦ Immune to Short Monitored Supply Transients
♦ No External Components Required
♦ Guaranteed from -40°C to +85°C
♦ Small 6-Pin SOT23 Package
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 pullup (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.
Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
The MAX6339 is available in a small 6-pin SOT23 pack-
age and operates over the extended (-40°C to +85°C)
temperature range.
MAX6339_UT-T*
-40°C TO +85°C
6 SOT23-6
*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.
________________________Applications
Telecommunications
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
High-End Printers
Desktop and Network Computers
Data Storage Equipment
Networking Equipment
Industrial Equipment
Set-Top Boxes
Typical Operating Circuit
MAX6339
IN1
SUPPLIES
TO BE
IN2
µP
RESET
MONITORED
IN3
IN4
GND
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
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.