I/O circuit of semiconductor integrated device

摘要

An input circuit of a semiconductor integrated circuit device includes a PMOS transistor P11 provided between an internal power supply VDD and a node S13; a PMOS transistor P12 which is provided between a node I/O to which a signal is input from an external circuit and the node S13, a POS transistor P15 which is provided between the node S13 and the node W11; and NMOS transistor N16 which controls the potential of the node S11 on the basis of the potential of the node I/O; and a second circuit which controls the potential of a node S14 on the basis of the potential of the node I/O.