CIRCUIT FOR GENERATING INTERMEDIATE-LEVEL POTENTIAL, POTENTIAL COMPARISON CIRCUIT, AND INPUT/OUTPUT CIRCUIT EQUIPPED THEREWITH AND OPERATED BY VARIABLE DRIVE VOLTAGE

摘要

PROBLEM TO BE SOLVED: To provide the input/output circuit which is equipped with an intermediate-level potential generator circuit that can be driven at low power and which operates with the variable drive voltage.;SOLUTION: The input/output circuit which operates with the variable drive voltage is a multi-level input/output circuit that comprises an intermediate-level potential generating part 320 for generating an intermediate-level potential Vref having a middle value between a high level potential and a low level potential; a potential comparison part 340 for comparing the intermediate-level potential Vref with the external potential Vin that an external apparatus uses, when inputting/outputting a signal and outputting a resu and an interface part 360 for inputting/outputting the signal from/to the external apparatus with a potential selected by the output value of the potential comparison part 340. The intermediate-level potential generating part 320 adjusts the intermediate-level potential with the voltage between the source and the drain of a MOS transistor.;COPYRIGHT: (C)2006,JPO&NCIPI