Patent ID: 6924533

Claim:
A semiconductor integrated circuit device, comprising: a plurality of terminals each connected to each of a plurality of internal circuits; a plurality of current mirror circuits, each connected to each of the plurality of terminals and each comprising an input-side circuit into which a first current flows from a terminal to which each current mirror circuit is connected and an output-side circuit into which a second current proportional to the first current flows from the terminal to which said each current mirror circuit is connected when an overvoltage is applied to the terminal to which said each current mirror circuit is connected; a single first load shared by all of the plurality of current mirror circuits and connected between each input-side circuit of all of the plurality of current mirror circuits and ground so as to permit the first current fed out from any one of input-side circuits to flow through the first load; and a plurality of second loads each of which connected between each output-side circuit of all of the plurality of current mirror circuits and ground so as to permit the second current fed out from an output-side circuit corresponding to said any one of input-side circuits to flow through a second load thereof, wherein, when an overvoltage is applied to one of the plurality of terminals, a current mirror circuit connected thereto permits a first current and a second current to flow therethrough by way of an input-side circuit and an output-side circuit included therein respectively, the first load by being comprised of an overvoltage protection circuit protects an internal circuit connected to said one of the plurality of terminals from the overvoltage by permitting said first current to flow therethrough to ground, and the second load by being comprised of an overvoltage detection circuit detects the overvoltage by permitting said second current to flow therethrough to ground.