Exar Corporation

Loi Thanh Le

Bahram Fotouhi

Pekka Ojala

A circuit for putting an output driver into a high impedance state upon failure of the power supply. This is accomplished by providing a first transistor that is connected between the power supply and the n-well to charge the n-well node of the PMOS drive transistor. Upon failure of the supply voltage, a number of transistors are connected to couple the n-well and a gate of the PMOS drive transistor to the output line, so that they track the voltage level of the output, thereby preventing forward biasing of the P&plus;/n-well diode.

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San Jose, CA, United States of America

Loi Thanh Le