Patent ID: 7652505

Claim:
A level conversion circuit for converting a first signal having a first logic level of a reference potential and a second logic level of a first power supply potential into a second signal having a first logic level of said reference potential and a second logic level of a second power supply potential for providing to an output node, said level conversion circuit comprising: a first transistor of a first conductivity form having a first electrode receiving said second power supply potential, and a gate electrode and a second electrode connected to each other; a second transistor of the first conductivity form having a first electrode receiving said second power supply potential, a gate electrode connected to the gate electrode of said first transistor and a second electrode connected to a prescribed node; a third transistor of a second conductivity form having a gate electrode receiving said first signal; a first switching element of the second conductivity form connected between the second electrode of said first transistor and said reference potential in series with said third transistor; a fourth transistor of the second conductivity form having a first electrode connected to said prescribed node, a gate electrode receiving an inverted signal of said first signal and a second electrode receiving said reference potential; a second switching element of the first conductivity form connected between said second power supply potential and said prescribed node; a fifth transistor of the first conductivity form having a first electrode receiving said second power supply potential, a gate electrode connected to said prescribed node, and a second electrode connected to said gate electrodes of said first and second transistors; and an output circuit for bringing said first switching element into conduction and said second switching element out of conduction to set said output node to said reference potential when a potential of said prescribed node is lower than a prescribed level, and for bringing said first switching element out of conduction and said second switching element into conduction to set said output node to said second power supply potential when the potential of said prescribed node is higher than said prescribed level.