Sigmastar Technology Ltd.

Chi-Yun Liu

Chang-Han Li

A fail-safe input/output device includes an input/output circuit, a comparator circuit and a resistance adjustment circuit. The input/output circuit transmits a voltage having a higher voltage level in a first supply voltage and a second supply voltage to a first node to generate a driving voltage, wherein a first target level of the first supply voltage is lower than a second target level of the second supply voltage. The comparator circuit compares the first supply voltage with the second supply voltage to generate a control signal, and selectively transmits the first supply voltage to the first node according to the control signal. The resistance adjustment circuit adjusts a resistance between the first node and a second node according to the second supply voltage, wherein the input/output circuit transmits the second supply voltage to the first node via the second node.

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Taiwan, Taiwan

Chi-Yun Liu