ELECTROSTATIC DISCHARGE CLAMP WITH CONTROLLED HYSTERESIS INCLUDING SELECTABLE TURN ON AND TURN OFF THRESHOLD VOLTAGES
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United States of America Patent
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Issued Date -
Apr 25, 2013
app pub date -
Dec 13, 2012
filing date -
Oct 28, 2009
priority date (Note) -
Abandoned
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Abstract
An electrostatic discharge (ESD) clamp for coupling between first and second nodes for providing ESD protection including first and second voltage threshold circuits. The clamp circuit limits operating voltage between the first and second nodes to a maximum level when activated. The first and second voltage threshold circuits each have a selectable threshold voltage, such as by coupling one or more voltage threshold devices in series. The first and second voltage threshold circuits trigger to turn on the clamp circuit when the operating voltage increases above a first voltage threshold. The voltage threshold circuits are turned off to turn off the clamp circuit when the operating voltage decreases to the second threshold voltage. The second threshold voltage may be selected at any level above the nominal operating voltage to prevent the clamp from latching.
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