Semiconductor device with cmos logic circuits that operate on plural power voltages

A functional circuit comprising:

• a first CMOS logic circuit including a first PMOS transistor and a first NMOS transistor;
• and
• a second CMOS logic circuit including a second PMOS transistor and a second NMOS transistor,
• wherein the first and second PMOS transistors are independently provided in first and second nwells, respectively,
• wherein the first and second NMOS transistors are provided in a first pwell, and
• wherein the first pwell is electrically isolated from a semiconductor substrate by the first nwell and a first deep nwell located at a bottom of the first nwell and the first pwell.

An apparatus comprising:

• a functional circuit including a first PMOS transistor and a first NMOS transistor;
• and
• a control circuit configured to control the functional circuit, and including a second PMOS transistor and a second NMOS transistor,
• wherein the first PMOS transistor has a source region supplied with a first power potential, a drain region, and a gate electrode,
• wherein the first NMOS transistor has a source region supplied with a second power potential lower than the first power potential, a drain region electrically connected to the drain region of the first PMOS transistor, and a gate electrode electrically connected to the gate electrode of the first PMOS transistor,
• wherein the second PMOS transistor has a source region supplied with a third power potential lower than the first power potential and higher than the second power potential, a drain region, and a gate electrode,
• wherein the second NMOS transistor has a source region supplied with the second power potential, a drain region electrically connected to the drain region of the second PMOS transistor, and a gate electrode electrically connected to the gate electrode of the second PMOS transistor, and
• wherein the source and drain regions of the first NMOS transistor and the source and drain regions of the second NMOS transistor are provided in a first pwell in common.