Patent ID: 7554863

Claim:
A voltage control circuit connected to a combination of a decoder circuit and a level conversion circuit connected to the decoder circuit, the voltage control circuit comprising: a level conversion circuit voltage line applying a voltage to the level conversion circuit; and a boost voltage connection switching circuit switching a voltage applied to the level conversion circuit voltage line according to an output signal from the decoder circuit, wherein: a plurality of sets of the combination of the decoder circuit and the level conversion circuit are prepared; and the plurality of sets of the combination are divided into groups, each composed of a plurality of the decoder circuits and a plurality of the level conversion circuits, the voltage control circuit being provided for each of the groups, the level conversion circuit voltage line being connected in common to the plurality of level conversion circuits, the voltage control circuit further comprising a logic circuit, the logic circuit receiving outputs from the plurality of decoder circuits, and the voltage applied to the plurality of level conversion circuit being switched by inputting an output of the logic circuit to the boost voltage connection circuit.