| 摘要 |
PURPOSE:To select ICs of different kinds formed onto the same one semiconductor wafer by setting up a first circuit and a second circuit having a function different from one of said circuit to the same substrate. CONSTITUTION:Input signals are inputted to input gates G1, G2, G3, and the information contents of the circuit S constituted by a gate array or an ROM or the like are outputted through amplifying gates A1, A2, A3. Zener diodes ZD, gates G4, G5, memories M and amplifying circuits A3, A4, A5 are added and formed to the dead regions in each IC chip. When voltage is the input signal voltage or more of normal operation, the diode ZD is turned ON from OFF, the gates G4, G5 are operated, and the informations of the memory M are outputted from normal output terminals O1, O2, O3 through the amplifying gates A3, A4, A5. Operation by the normal input signals of the amplifying gates A1, A2, A3 is not conducted by an output from the gate G4 at that time. |
