VOLTAGE CLAMPING CIRCUIT
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United States of America Patent
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Jul 21, 2015
Grant Date -
Jul 30, 2015
app pub date -
Jan 26, 2014
filing date -
Jan 26, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A voltage clamping circuit that is implemented using low voltage devices provides a way to discharge an input/output pin to ground during overvoltage conditions and to avoid any interaction between the input/output pin and the input/output supply during clamping action. The voltage clamping circuit is also self-protected. A voltage detection circuit detects an overvoltage condition and in response generates a signal that turns on a PMOS, which in turn provides a clamping current path between the input/output pin and ground.
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