Area efficient input protection

摘要

An integrated circuit has an input pad protected from electrostatic discharge by two diodes located under the periphery of the pad. One of the diodes is typically formed in a n-tub, and the other in a p-tub. The boundary between the tubs is located in a region not overlaid by the exposed portion of the pad in one embodiment. An input resistor is optionally included between the pad and the input circuitry for additional ESD protection.