Patent ID: 7660087
Filing Date: 2010-02-09
Classification: H02H

Abstract:
1. An electrostatic discharge (ESD) avoiding circuit, comprising: a first ESD protection unit, for transmitting an ESD current between a first conducting path and a second conducting path; an ESD detection unit, coupled between the first conducting path and the second conducting path, and having an input terminal and an output terminal coupled to the first ESD protection unit, for detecting whether or not an ESD occurred, and controlling the first ESD protection unit to conduct the ESD current according to a result of the detection; an RC filter unit, coupled between the second conducting path and a third conducting path, for coupling a first voltage to the input terminal; and a switch unit, coupled between the first conducting path and a core circuit, for determining whether or not to conduct the first conducting path to the core circuit according to signals of the input terminal and the output terminal of the ESD detection unit, wherein the switch unit comprises: a first transistor, having a gate coupled to the input terminal, a first source/drain coupled to the first conducting path, and a second source/drain coupled to the core circuit; and a second transistor, haying a gate coupled to the output terminal, a first source/drain coupled to the first source/drain of the first transistor, and a second source/drain coupled to the second source/drain of the first transistor.