Patent ID: 8653641

Claim:
An integrated circuit device comprising: a first chip including a first substrate and a main circuit formed on said first substrate; a second chip stacked on said first chip and including a second substrate that is independent from said first substrate, and a protective circuit for protecting said main circuit, said protective circuit being formed on said second substrate; a conductive channel unit extending from said protective circuit and electrically connected to said main circuit; and a solder pad unit for connecting to an external power source; wherein said main circuit of said first chip includes at least one transistor having a gate electrode, a drain electrode and a source electrode, said protective circuit of said second chip including at least one transistor having a drain electrode and a source electrode, said solder pad unit including an input/output pad that is electrically connected to said gate electrode of said at least one transistor of said main circuit and to one of said drain electrode and said source electrode of said at least one transistor of said protective circuit, said source electrode and said drain electrode of said at least one transistor of said main circuit being not directly and electrically connected to said input/output pad.