Electrostatic discharge protection circuitry

Details Electrostatic discharge protection circuitry Electrostatic discharge protection circuitry

2011-07-12

2011-07-12

Patel, Dharti H (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

C361S118000

Reexamination Certificate

active

07978450

ABSTRACT:
An integrated circuit has pins to which electrostatic discharge voltages may be delivered during electrostatic discharge events. Circuitry in the integrated circuit can be protected from damage by the electrostatic discharge voltages by electrostatic discharge protection circuitry. The electrostatic discharge protection circuitry may include one or more diodes that are connected between a given pin and ground to discharge negative electrostatic discharge voltages. Positive electrostatic discharge voltages may be discharged using a transistor that is connected between the pin and ground and that breaks down at a breakdown voltage. A voltage blocking circuit such as a circuit based on a voltage blocking transistor may be used to prevent damaging electrostatic discharge voltages from reaching sensitive circuitry. Pull down circuitry may be used to help ensure that the circuitry is protected from damage during electrostatic discharge events.

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