Semiconductor device incorporating internal power supply for compensating for deviation in operating condition and fabrication process conditions

A semiconductor device on a chip comprising:

• a current mirror circuit coupled to a first operating potential and producing at an output terminal an output current whose magnitude depends upon the magnitude of an input current;
• a current source coupled to an input terminal of said current mirror circuit setting said input current of said current mirror circuit to a constant current;
• an internal circuit including MOS transistors through which said output current of said current mirror circuit flows,
• a comparator comparing a voltage at a node, coupled to said output terminal of said current mirror circuit and said internal circuit, through which said output current flows, with a reference voltage smaller than said first operating potential;
• and
• a controller, coupled said current mirror circuit and performing control under control of an output of said comparator and an input pulse,
• wherein said controller responds to said input pulse to start to supply the output current of the current mirror circuit to said internal circuit, and when a voltage at said node of said internal circuit reaches a predetermined value, said output of said comparator causes said controller to stop the supply of said output current of said current mirror circuit to said internal circuit to thereby limit said node voltage.