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http://www.union-ic.com Rev.01 Jan.2015

11/14

UM805/811/812

UM805 Open-Drain RESET

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Output Allows Use with Multiple Supplies

Generally, the pull-up connected to the UM805 will connect to the supply voltage that is being

from the monitored supply to reset circuitry powered by some other supply (Figure 6). Note that as

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. Also,

with any pull-up, RESET

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occurs depends on the pull-up resistor value and the voltage to which it is connected.

3.3V

UM805

RESET

GND

Rpull-up

5V System

RESET

GND

5.0V

Figure 6. UM805 Open-Drain RESET

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Output Allows Use with Multiple Supplies