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UM805SE Datasheet(PDF) 11 Page - Union Semiconductor, Inc. |
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UM805SE Datasheet(HTML) 11 Page - Union Semiconductor, Inc. |
11 / 14 page ________________________________________________________________________ http://www.union-ic.com Rev.01 Jan.2015 11/14 UM805/811/812 UM805 Open-Drain RESET ______________ Output Allows Use with Multiple Supplies Generally, the pull-up connected to the UM805 will connect to the supply voltage that is being monitored at the IC’s VCC pin. However, some systems may use the open-drain output to level-shift from the monitored supply to reset circuitry powered by some other supply (Figure 6). Note that as the UM805’s VCC decreases below 1V, so does the IC’s ability to sink current at RESET ______________ . Also, with any pull-up, RESET ______________ will be pulled high as VCC decays toward 0. The voltage where this occurs depends on the pull-up resistor value and the voltage to which it is connected. 3.3V VCC UM805 RESET GND Rpull-up VCC 5V System RESET GND 5.0V Figure 6. UM805 Open-Drain RESET ______________ Output Allows Use with Multiple Supplies |
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