Hybrid electrostatic discharge protection circuit, chip and integrated circuit

Abstract

The invention relates to the technical field of integrated circuit design and discloses a hybrid electrostatic discharge protection circuit, a chip and an integrated circuit, and the hybrid electrostatic discharge protection circuit comprises a voltage division circuit which is electrically connected to a to-be-divided pin; a voltage detection circuit which is electrically connected to the voltagedivision circuit and is used for detecting the voltage of the electrostatic charge on the voltage division circuit and outputting a charge discharge instruction when the voltage is greater than a preset safety voltage threshold value; and a charge discharge switch which is electrically connected to the voltage detection circuit and is started to discharge the electrostatic charge in response to the charge discharge instruction. The hybrid electrostatic discharge protection circuit overcomes the defect that a good electrostatic protection effect cannot be achieved in the prior art.

Description

technical field [0001] The invention relates to the technical field of integrated circuit design, in particular to a hybrid electrostatic discharge protection circuit, chip and integrated circuit. Background technique [0002] With the development of modern integrated circuits, the feature size is getting smaller and smaller, the oxide layer is getting thinner, the working voltage is getting lower and lower, the working frequency is getting higher and higher, the integration is getting higher and higher, the cost is getting lower and more advanced The use of technology, resulting in the chip's ability to withstand static electricity is also decreasing. Static electricity usually has a very high instantaneous voltage (> several thousand volts), so this kind of damage is destructive and permanent, and it will cause the circuit to burn directly. However, static electricity will not be reduced because of this, so it is very meaningful to study the protection of electrostatic...

AI Technical Summary

Problems solved by technology

But this circuit has the problem of electrostatic current, which is not conducive to the application of low power consumption circuit

Moreover, the forward and reverse directions of this structure are protected by a single tube, which is easily damaged by a lower ESD voltage, so it cannot maintain the long-term and high-quality ESD protection effect

[0008] At present, there are not many researches and improvements on the new ESD circuit structure, mainly the performance improvement of the basic ESD device is carried out by the integrated circuit factory, and the emphasis of the work is placed on the device, and better electrostatic protection is obtained by using new devices effect, but the result of doing so has increased the cost of the circuit

Existing ESD protection circuits generally have unsatisfactory performance of the clamping device, the discharge time of the electrostatic charge is too long, the voltage on the input and output pin IO is still high, or after the discharge of static electricity, the discharge circuit cannot Turn off in time, causing the problem of power consumption

In addition, the electrostatic discharge circuit will keep the electrostatic voltage on the gate of the clamping device for a long time, which cannot achieve a good electrostatic protection effect

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