Patent ID: 8305720

Claim:
A latch-control protection circuit, which is adapted in a circuit system, comprises: a comparing unit, utilized for selectively outputting a default signal or a comparing signal according to a state signal, wherein the default signal is utilized for latching the state signal and the comparing signal is corresponded to a protecting event; and a logic gate, utilized for generating the state signal to an input of the comparing unit according to an output signal of the comparing unit and a system judging signal corresponding to an operational mode of the circuit system, wherein the output signal is the default signal or the comparing signal; wherein the comparing unit has an input switching unit and a comparator, the input switching unit selectively inputs a first input signal set or a second input signal set to the comparator according to the state signal, the first input signal set is corresponded to the comparing signal, and the second input signal set is corresponded to the default signal.