Semiconductor device

A semiconductor device comprising:

• a memory cell;
• a data line connected to the memory cell;
• voltage supplying means for supplying a supply voltage;
• supply voltage detecting means connected to the voltage supplying means for detecting at least two supply voltage regions separated by at least one set value and outputting a plurality of kinds of voltage detecting signals corresponding to the respective supply voltage regions;
• control signal input means for entering a first control signal for giving an instruction to read a data from the memory cell;
• current detecting means connected to the control signal input means, the voltage supplying means and the data line, for detecting, in response to the first control signal, a current flowing from the voltage supplying means to the data line by using a level sensing current in accordance with the supply voltage, the current detecting means having a plurality of different dependent characteristics as a dependent characteristic of the level sensing current upon the supply voltage;
• and
• dependent characteristic switching means connected to the supply voltage detecting means and the current detecting means, for switching the dependent characteristics of the level sensing current to be two of the different dependent characteristics in accordance with the kind of a voltage detecting signal output by the supply voltage detecting means.