Quad Voltage Microprocessor
Supervisory Circuit
ADM6339
Rev. A
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FEATURES
Accurate monitoring of up to four power supply voltages
6 factory-set threshold options: −5.0 V, +1.8 V, +2.5 V, +3.0 V,
+3.3 V, and +5.0 V
Adjustable input threshold options: −0.5 V (±2.0% accuracy),
+0.62 V (±0.8% accuracy), and +1.23 V
200 ms typical reset timeout
Open-drain
RESET
output (10 μA internal pull-up)
Reset output stage: active low, valid to IN
1
= 1 V or IN
2
= 1 V
Low power consumption (55 μA)
Glitch immunity
Specified from −40°C to +85°C
6-lead SOT-23 package
APPLICATIONS
Telecommunications
Microprocessor systems
Data storage equipment
Servers/workstations
FUNCTIONAL BLOCK DIAGRAM
V
REF
IN
4
IN
3
IN
2
IN
1
200ms
TIMEOUT
ADM6339
IN
2
IN
1
5V PULLUP
08169-001
RESET
Figure 1.
GENERAL DESCRIPTION
The ADM6339 is a high accuracy supervisory circuit capable of
monitoring up to four system supply voltages.
The ADM6339 incorporates a variety of internally pretrimmed
undervoltage threshold options for monitoring −5.0 V, +1.8 V,
+2.5 V, +3.0 V, +3.3 V, and +5.0 V supply voltages. Tolerance levels
of ±5% and ±10% are available. The device is also available
with one to three adjustable threshold options. The adjustable
voltage threshold options are +1.23 V, +0.62 V, and −0.5 V. See
the Ordering Guide section for a list and description of all
available options.
If a monitored power supply voltage decreases below the mini-
mum voltage threshold (or rises above the maximum voltage
threshold for the −0.5 V and −5.0 V input options), a single
active low output asserts, triggering a system reset. The output
is open drain with a weak internal pull-up to the monitored IN
2
supply of typically 10 µA. After all voltages exceed the selected
threshold level, the reset signal remains low for the reset
timeout period (200 ms typical).
The ADM6339 output remains valid as long as IN
1
or IN
2
exceeds
1 V. Unused monitored inputs should not be allowed to float or
to be grounded; instead, they should be connected to a supply
voltage greater than their specified threshold voltages.
The ADM6339 is available in a 6-lead SOT-23 package. The
device operates over the extended temperature range of −40°C
to +85°C.
