ESD protection device for electrostatic protection

Abstract

The invention discloses an ESD protection device for electrostatic protection, which is mainly used to solve the problems of false triggering and large layout area of the traditional RC trigger circuit. The ESD protection device includes an RC trigger circuit, a holding time circuit and a discharge NMOS transistor M3 which are connected in series in turn. The RC trigger circuit detects an electro-static discharge ESD event and transmits a detected signal to the holding time circuit. The holding time circuit controls the opening time of the discharge NMOS transistor M3 according to the detectedsignal to ensure that the discharge NMOS transistor M3 has sufficient time to discharge the electro-static discharge ESD current. According to the invention, the holding time circuit is used to separate the electro-static charging time detected by the RC trigger circuit from the function of the holding releasing time. False triggering and the layout area are reduced while it is ensured that the discharge NMOS transistor M3 has sufficient opening time. The ESD protection device for electrostatic protection can be used in the electrostatic protection design of integrated circuits.

Description

technical field [0001] The invention belongs to the technical field of semiconductor components, and in particular relates to a protection device, which can be used in the electrostatic protection design of integrated circuits. Background technique [0002] With the continuous development of microelectronics technology, the feature size of electronic devices is getting smaller and smaller, which means that the gate oxide layer is getting thinner and thinner, its breakdown voltage is getting smaller and lower, and the reliability is lower. However, the electrostatic environment in which the chip is produced, manufactured, and used has not changed. Therefore, it is very important to provide good electrostatic protection and ESD protection for advanced nanoscale chips. RC trigger circuits are usually used to detect and discharge ESD current, so how to optimize RC trigger circuits has become a very meaningful research work. [0003] The detection circuit in the traditional RC t...

AI Technical Summary

Problems solved by technology

Although the performance of this traditional RC trigger circuit is acceptable, the RC network occupies too much layout area and the cost is very high, and as the normal power-on speed becomes faster and faster, it is similar to the power-on speed of hot-swapping and waking up a dormant system. It can reach one microsecond or even faster. If the traditional RC network is still used, it will cause false triggering, that is, the ESD protection circuit mistakenly regards the normal power-on event as an ESD event, and turns on the discharge NMOS tube, resulting in energy loss or even a shock. wear dangerous

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