Electrostatic discharge protection system for mixed voltage appl

Active solid-state devices (e.g. – transistors – solid-state diode – Field effect device – Having insulated electrode

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257356, 257357, 257360, 257362, 257363, 257203, H01L 2362, H01L 2710

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active

056169434

ABSTRACT:
An ESD protection system that makes use of several different types of over-voltage protection devices provides ESD conduction paths between different power lines. For example, the system may employ shunt diodes between the ground lines of the different power supplies and between I/O pads and power supply lines; SCR protection between I/O pads and ground; and thick field device protection between different power supply V.sub.DD lines. In this way, a conduction path for an ESD event between two input, output power and ground pads may be implemented using the device whose switching characteristics are best suited to that application.

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Thomas M. Frederiksen, Standard Circuits in the New CMOS Era, Electrostatic Discharge Improvement, 1984, pp. 129-130.

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