Patent ID: 7362159

Claim:
A semiconductor integrated circuit comprising: a laser beam irradiation object provided above a substrate, the laser beam irradiation object having one end portion at which a first potential is applied, and having conduction being cut off upon irradiation with a laser beam; a first transistor which is provided on the substrate and has a source and a drain, wherein one of the source and the drain is electrically connected to the other end portion of the laser beam irradiation object, the first transistor being supplied with a second potential as a back bias which is different from the first potential, and having a channel fonned of a first conductive type; a second transistor which has a source and a drain, wherein one of the source and the drain of the first transistor, which is electrically not connected to the other end portion of the laser beam irradiation object, is electrically connected to one of the source and the drain of the second transistor and the second potential is supplied to the other one of the source and the drain of the second transistor, the second transistor being supplied with the second potential as a back bias, and having a channel formed of the first conductive type; and a storage circuit which is electrically connected to the one of the source and the drain of the second transistor to which the first transistor is electrically connected, and which is additionally electrically connected to the one of the source and the drain of the first transistor to which the other end portion of the laser beam irradiation object is not electrically connected; and wherein the first transistor and the second transistor are both N-channel transistors each having a channel of an N type as the first conductive type, V DD is supplied as the first potential to the one end portion of the laser beam irradiation object, and V SS is supplied as the second potential to the individual back biases for the first transistor and the second transistor and to the source of the second transistor, the other end portion of the laser beam irradiation object is electrically connected to the drain of the first transistor, the source of the first transistor is electrically connected to the drain of the second transistor, and the storage circuit is individually electrically connected to the source of the first transistor and the drain of the second transistor, and in any of a case where the conduction of the laser beam irradiation object is cut off and a case where breakage is caused between the source of the first transistor and at least one of a gate of the first transistor and the substrate, a potential of the gate of the first transistor is set to the V SS defined as the second potential.