Patent ID: 7551415

Claim:
A repair circuitry having at least one electrical fuse forming part of a conduction path between a positive voltage supply pad and a complimentary lower voltage supply source, the repair circuitry comprising: at least one first switching device having a control terminal and coupled between the positive voltage supply pad and the at least one electrical fuse; at least one second switching device controlled by a predetermined bit-line and coupled between the at least one first switching device and the at least one electrical fuse, wherein the at least one second switching device is a PMOS transistor and the predetermined bit-line is coupled to the gate of the PMOS transistor through an odd number of inverters; and at least one control circuitry coupled to the control terminal and the positive voltage supply pad respectively, wherein the at least one control circuitry delays the turn-on state of the first switching device for a predetermined period of time upon an application of a positive high voltage to the positive voltage supply pad.