HOT PLUG IMMUNITY FOR CIRCUIT PROTECTING AGAINST ELECTROSTATIC DISCHARGE EVENTS
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United States of America Patent
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Mar 23, 2017
app pub date -
Sep 18, 2015
filing date -
Sep 18, 2015
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Abstract
A hot plug immune circuitry (100) for protecting against electrostatic discharge events comprises an input/output (I/O) pad (101) of an electronic system with a pad threshold voltage and connections to ground potential by a first circuit (110) and a parallel second circuit (130). The first circuit includes a MOS field-effect transistor (FET) (111) doubling as a parasitic bipolar transistor. The second circuit is a voltage level sensor formed as a voltage divider with a first impedance (131) tied by a link (133) in series with a second impedance (132). Link (133) is cross-tied (134) to the FET of the first circuit, and carries a shut-off voltage for the FET determined by the pad threshold voltage diminished by the ratio of the first and the second impedances.
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