Electrostatic discharge protection circuit
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United States of America Patent
Stats
-
Jun 5, 2012
Grant Date -
Jul 29, 2010
app pub date -
Jul 14, 2008
filing date -
Jul 30, 2007
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An integrated circuit having a plurality of circuit blocks, each block having one or more positive voltage supply pads, one or more negative voltage supply pads, and one or more signal pads. The integrated circuit further comprises an electrostatic protection circuit comprising a first electrostatic discharge protection rail for connection to a positive voltage supply point, a second electrostatic discharge protection rail for connection to a negative voltage supply point, and first protection circuitry coupling each said signal pad to both said first and second electrostatic discharge protection rails, the first protection circuitry being configured to provide a conduction path to one of the first and second rings in the event of an excessive voltage being present on one of said signal pads.
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