Power-supply-voltage reduction device, semiconductor integrated circuit device including the reduction device and method of producing electronic device including such devices

A semiconductor integrated circuit device comprising:

• a voltage reduction circuit including:
• a plurality of transistors having first current electrodes supplied with an external power supply voltage, control electrodes receiving a control signal, and second current electrodes which are connected together to an output port, the second current electrodes producing a reduced power supply voltage which is generated from said external power supply voltage according to said control signal, at said output port;
• and
• a voltage control circuit generating said control signal based on a comparison of said reduced power supply voltage and a reference voltage, and controlling at least one of said plurality of transistors for maintaining the reduced power supply voltage substantially to a level of the reference voltage;
• a transistor control circuit so as to activate at least one of said plurality of transistors by a user according to a level of said external power supply voltage supplied to a power supply line;
• and
• an internal circuit to which said reduced power supply voltage is supplied as an internal power supply voltage.

A semiconductor integrated circuit device comprising:

• a voltage reduction circuit including:
• a plurality of transistors having first current electrodes supplied with an external power supply voltage, control electrodes receiving a control signal, and second current electrodes which are connected together to an output port, the second current electrodes producing a reduced power supply voltage which is generated from said external power supply voltage according to said control signal, at said output port;
• and
• a voltage control circuit generating said control signal based on a comparison of said reduced power supply voltage and a reference voltage, and controlling at least one of said plurality of transistors for maintaining the reduced power supply voltage substantially to a level of the reference voltage;
• a voltage-reduction-circuit control circuit discriminating a voltage level of said external power supply voltage which is supplied to a power supply line, and controlling said voltage reduction circuit for activating an associated number of the transistors according to the voltage level of the external power supply voltage;
• and
• an internal circuit to which said reduced power supply voltage is supplied as an internal power supply voltage.