19-1756; Rev 2; 10/01
Quad Voltage 碌P Supervisory Circuit
in SOT Package
General Description
The MAX6339 is a precision quad voltage monitor with
microprocessor (碌P) 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 (10碌A) 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掳C to +85掳C)
temperature range.
Features
o
Monitors Four Power-Supply Voltages
o
Precision Factory-Set Reset Threshold Options
for +5.0V, +3.3V, +3.0, +2.5V, +1.8V, and -5.0V
Supplies
o
User-Adjustable Voltage Monitoring Threshold
Options
o
Low 55碌A Supply Current
o
Open-Drain
RESET
Output with 10碌A Internal
Pullup
o
140ms (min) Reset Timeout Period
o
RESET
Valid to IN1 = 1V or IN2 = 1V
o
Immune to Short Monitored Supply Transients
o
No External Components Required
o
Guaranteed from -40掳C to +85掳C
o
Small 6-Pin SOT23 Package
MAX6339
Ordering Information
PART
MAX6339_UT-T*
TEMP. RANGE
-40掳C TO +85掳C
PIN-PACKAGE
6 SOT23-6
________________________Applications
Telecommunications
High-End Printers
Desktop and Network Computers
Data Storage Equipment
Networking Equipment
Industrial Equipment
Set-Top Boxes
*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.
Typical Operating Circuit
IN1
SUPPLIES
TO BE
MONITORED
IN2
IN3
IN4
MAX6339
碌P
RESET
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鈥檚 website at www.maxim-ic.com.
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