Patent ID: 7280336

Claim:
In an electronic system comprising a power supply, a ground and a resetting device capable of being triggered by a transient voltage detecting circuit, the circuit comprising: N first detecting devices which each comprises a respective number (P i ) of detecting units, each of the detecting units having a first reference terminal, a second reference terminal, a setting input and an output, in the ith first detecting device, the second reference terminals of all of the detecting units being coupled to the ground, the first reference terminal of the first detecting unit being coupled to the power supply, and a first resistance being coupled between the first reference terminal of the (j+1)th detecting unit and the first reference terminal of the jth detecting unit, wherein N is an integer equal to or larger than 1, i is an integer index ranging from 1 to N, and j is an integer index ranging from 1 to (P i −1); at least one voltage source, the setting input of each of the detecting units being respectively coupled to an output of at least one of the voltage sources such that the output of the one detecting unit is initially latched by the output of the voltage source coupled to the one detecting unit; a decision device having an input port, respectively coupled with the outputs of all of the detecting units, the decision device outputting a first logic according to the initial outputs of all of the detecting units; and wherein when a transient voltage occurs at the power supply, in the ith first detecting device, the transient voltage is decayed by the first resistance coupled between the (j+1)th detecting unit and the jth detecting unit, the logic of the output of one of the detecting units is changed by the transient voltage or the decayed transient voltage, such that the decision device renewably outputs a second logic to trigger the resetting device in accordance with the outputs of all of the detecting units.