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)

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

200ms

TIMEOUT

ADM6339

5V PULLUP

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

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).

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.