Electrostatic discharging protection circuit and structure and working method of electrostatic discharging protection circuit

Abstract

The invention provides an electrostatic discharging protection circuit and structure and a working method of the electrostatic discharging protection circuit. The circuit comprises a first circuit anda second circuit, wherein the first circuit comprises a first MOS transistor, a first resistor and a first capacitor, two ends of the first resistor are respectively connected with a source and a gate of the first MOS transistor, two ends of the first capacitor are respectively connected with the gate and a drain of the first MOS transistor, the second circuit comprises a second MOS transistor, asecond resistor and a second capacitor, two ends of the second resistor are respectively connected with a gate and a source of the second MOS transistor, and two ends of the second capacitor are respectively connected with a drain and the gate of the second MOS transistor. The sustaining voltage of the electrostatic discharging circuit is relatively high, so that the electrostatic discharging circuit can be closed after electrostatic discharging, and the normal working of a chip needed to be protected is difficult to affect; and meanwhile, a trigger voltage of the electrostatic discharging protection circuit is relatively low, so that the electrostatic discharging protection circuit is easy to conduct, and the protection performance of the chip needed to be protected can be improved.

Description

technical field [0001] The invention relates to the technical field of semiconductor manufacturing, in particular to an electrostatic discharge protection circuit and its structure and working method. Background technique [0002] Static electricity is an objectively existing natural phenomenon, which can be produced in many ways, such as contact, friction, induction between electrical appliances, etc. Static electricity has the characteristics of long-term accumulation, high voltage, low power, low current and short action time. [0003] For electronic products, electrostatic discharge (Electrostatic discharge, ESD) is a major factor affecting the reliability of integrated circuits. Electrostatic discharge is a rapid neutralization process of electric charge. Because the electrostatic voltage is very high, it will bring destructive consequences to the integrated circuit, resulting in the failure of the integrated circuit. Therefore, in order to protect the integrated cir...

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Problems solved by technology

[0005] However, the existing electrostatic protection circuit has the disadvantage of poor stability

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