Patent ID: 7532058

Claim:
A fuse option circuit, comprising: a fuse having an untrimmed state and a trimmed state, and selectively coupled to a ground potential; a voltage source control switch which has a first terminal coupled to a voltage source potential, a second terminal coupled to the fuse, and a control terminal receiving a control signal having a first logical level and selectively conducting the first terminal and the second terminal based on the first logical level; a latch having a set input terminal coupled to both the fuse and the voltage source control switch, and a reset input terminal receiving a reset pulse signal having a second logical level and outputting a driving signal having a third logical level; and a logical operational controller electrically coupled to the latch and the control terminal for outputting the control signal feedback to the voltage source control switch by operating the driving signal and outputting a selected result signal having a fourth logical level, wherein: the set input terminal is set to a first low logical level while the fuse is in the untrimmed state; and whenever the second logical level is inverted in the untrimmed state, the first, the third and the fourth logical levels are inverted and the set input terminal remains at the first low logical level.