| 摘要 |
PROBLEM TO BE SOLVED: To provide a detection circuit for detecting an open condition in which a ground terminal in a chip is not connected to an external terminal. SOLUTION: An integrated circuit device includes a chip having a power supply terminal, a ground terminal, an input terminal, and an internal circuit formed therein. The chip includes: a unidirectional element disposed between the input terminal and the ground terminal and directed from the ground terminal to the input terminal; and a ground open detection circuit. The ground open detection circuit includes a first transistor having the gate connected to the input terminal and the source and the drain connected between the power supply terminal and the ground terminal, a second transistor having the gate connected to the ground terminal and the source and the drain connected between the power supply terminal and the ground terminal, and a comparator for comparing potentials of nodes respectively between drains of the first and second transistors and the power supply terminal, and for outputting a ground open detection signal indicative of an open condition in which the ground terminal of the chip is not connected to an external ground terminal. COPYRIGHT: (C)2011,JPO&INPIT
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