Electrostatic discharge protection circuit and chip with electrostatic discharge protection circuit

Abstract

The invention discloses an electrostatic discharge protection circuit and a chip with the electrostatic discharge protection circuit. The electrostatic discharge protection circuit comprises an RC module (101), an alarm module (102) and a discharge module (103), when the input voltage of the RC module (101) is increased, the output voltage of the RC module (101) is increased; the alarm module (102) receives an input voltage of the RC module (101) and an output voltage of the RC module (101), an alarm voltage of the alarm module (102) is increased when the input voltage of the RC module (101) is increased, and an electrostatic alarm signal is output when the alarm voltage is greater than or equal to the output voltage of the RC module (101); the discharge module (103) receives the input voltage of the RC module (101) and the output voltage of the RC module (101), the discharge voltage of the discharge module (103) is increased when the input voltage of the RC module (101) is increased, and when the discharge voltage is greater than or equal to the output voltage of the RC module (101), electrostatic discharge is performed, and the alarm voltage is greater than the discharge voltage. According to the protection circuit, electrostatic discharge can be carried out according to the learning in advance, the working stability of the chip is improved, and the user experience is improved.

Description

technical field [0001] The embodiments of the present application relate to the field of electronic technology, and in particular to an electrostatic discharge protection circuit and a chip having the electrostatic discharge protection circuit. Background technique [0002] Electro-Static Discharge (ESD) events will occur in different degrees during the production, testing, transportation, and use of chips. When an electrostatic discharge event occurs, a large amount of charge will be poured into the chip from the outside to the inside in an instant. If the chip encounters an electrostatic discharge event during operation, or the impact of external electrostatic coupling, it will cause the chip system to enter an abnormal state (such as abnormal reset, runaway or deadlock), affecting the normal operation of the chip. Whether the chip can withstand the electrostatic discharge event is an important detection standard for the chip electromagnetic compatibility (Electromagnetic...

AI Technical Summary

Problems solved by technology

[0004] Although the chip is equipped with an electrostatic discharge protection circuit to avoid damage to the internal circuit of the chip when an electrostatic discharge event occurs, it is impossible to control the chip against electrostatic discharge because it is impossible to know in advance whether the electrostatic discharge protection circuit will perform electrostatic discharge. Take any software or hardware preventive measures for electrostatic discharge of the discharge protection circuit

If such preventive measures are lacking, on the one hand, the electrostatic discharge that occurs in a complex electromagnetic environment may cause the devices in the chip to be broken down, resulting in abnormal chip current, or completely damaging the chip, etc., causing the chip to have unrecoverable hardware. On the other hand, during the electrostatic discharge process of the electrostatic discharge protection circuit, the voltage of each node on the discharge path will change instantaneously, and a series of operation errors (such as abnormal reset, program deadlock, etc.) may occur on the chip. ), although these operating errors are non-physical damages that can be recovered by external interventions such as power-off or reset, they may still lead to greater errors at the system level of the chip, thereby reducing the stability of the chip's work and damaging the user experience

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