Semiconductor device having identification information generating function and identification information generation method for semiconductor device

A semiconductor device comprising an identification information generation circuit including

• a power supply control circuit having a first input node to which a first control signal is applied, a first power supply voltage output node, a second power supply voltage output node, and a third power supply voltage output node, and
• a memory array having a bit line pair, a word line, a memory cell connected to said bit line pair and said word line, and a first cell power line, a second cell power line and a third cell power line connected to said memory cell,
• said first cell power line, said second cell power line and said third cell power line being connected to said first power supply voltage output node, said second power supply voltage output node and said third power supply voltage output node, respectively,
• said memory cell having a first conductivity type MOS transistor and a second conductivity type MOS transistor,
• said power supply control circuit being configured to output a first supply voltage to said first power supply voltage output node and said second power supply voltage output node and a second supply voltage to said third power supply voltage output node when said first control signal is in a first state, and
• output an intermediate voltage to said first power supply voltage output node, said second power supply voltage output node and said third power supply voltage output node when said first control signal is in a second state, said intermediate voltage having a value higher than a value obtained by adding an absolute value of a threshold voltage of said first conductivity type MOS transistor to said first supply voltage and lower than a value obtained by subtracting an absolute value of a threshold voltage of said second conductivity type MOS transistor from said second supply voltage.