Semiconductor integrated circuit device

摘要

An inventive semiconductor integrated circuit device includes: an external connection terminal 1 ; an electrostatic discharge protection circuit 2 ; an output circuit 3 ; an output prebuffer circuit 4 ; an input prebuffer circuit 5 ; an internal circuit 41 ; an inter-power supply electrostatic discharge protection circuit 6 ; and a gate voltage control circuit 7 . The gate voltage control circuit 7 has a capacitor 25 and a resistor 26 , and the inter-power supply electrostatic discharge protection circuit 6 has an NMIS transistor 24 . When a positive surge is applied to the external connection terminal 1 , the gate potential of the NMIS transistor 24 is also increased. Thus, the NMIS transistor 24 is turned on, and the positive electrical charge supplied to the external connection terminal 1 is discharged toward a ground line 23.