公开(公告)号：JPH08227991A

公开(公告)日：1996-09-03

申请号：JP24323695

申请日：1995-09-21

Applicant: SGS THOMSON MICROELECTRONICS ,  CONS RIC MICROELETTRONICA

Inventor： SERUJIYO PARAARA ,  RATSUFUAERE ZANBURAANO

IPC: H01L27/04 ,  H01L27/02 ,  H01L29/78 ,  H03K17/08 ,  H03K17/687

Abstract: PROBLEM TO BE SOLVED: To provide a circuit by which the electrical continuity of the parasitic component of an integrated circuit can be prevented. SOLUTION: A power supply part 2, a low voltage component which is isolated from the power supply part by an insulating region 7 and a reference voltage region S having a reference voltage are provided. The power supply part 2 has an N-type substrate region D, which is biased by a terminal voltage VD from the reference voltage. The insulating region 7 has P-type conductivity. The low voltage element has an N-type input region 6 connected electrically to an input voltage VIN. Further, electrical continuity lines L1 , L2 and L3 which can be opened and closed by switches are provided between the insulating region 7 and a substrate region D, the input region 6 and the reference voltage region S respectively and the insulating region 7 is electrically connected with the switch to the region, selected from among the substrate region D, the input region 6 and the reference voltage region S to have a lowest voltage.