Power supply clamp ESD (Electronic Static Discharge) protection circuit combining direct current trigger and transient trigger

Abstract

The invention discloses a power supply clamp ESD (Electronic Static Discharge) protection circuit combining direct current trigger and transient trigger. The power supply clamp ESD protection circuit comprises a transient trigger module, a direct current trigger module and a bleeding device. The transient trigger module judges whether electronic static discharge impact occurs according to the rising time of current pulses; if so, the transient trigger module sends a first responding signal to make the direct current trigger module to enter the available state; when the direct current trigger module is in the available state, the direct current trigger module makes the bleeding device to be in the on state when the amplitude of the current impulses is equal to or higher than the trigger voltage of the direct current trigger module; the bleeding device is used for bleeding electronic static discharge charges. When a chip of the power supply clamp ESD protection circuit works normally, the transient trigger module is closed, and the direct current trigger module is in an unavailable state. The power supply clamp ESD protection circuit can avoid the influence of mistaken trigger and high-frequency noise, and greatly reduces electric leakage.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, and more specifically relates to a power clamp ESD protection circuit combining DC trigger and transient trigger. Background technique [0002] Electrostatic discharge (Electronic Static Discharge, ESD) protection circuit is an indispensable part to ensure the normal operation of the chip, especially in CMOS integrated circuits, the continuous progress of the process makes the gate oxide layer of the device thinner and its breakdown voltage is also higher The lower and lower, this puts forward higher requirements for the robustness of the ESD protection circuit. The effective ESD protection circuit structure can be quickly turned on when the ESD impact comes, providing a low-resistance channel for the discharge of electrostatic charges, allowing a large amount of electrostatic charges to be quickly discharged in the form of large currents, and clamping the voltage pin voltage VDD The...

AI Technical Summary

Problems solved by technology

but in Figure 5 Under the high-frequency noise shown, the thyristor SCR may be falsely triggered. At this time, the chip is in the working state and maintains the voltage V hold in image 3 Between the DC trigger voltage (Vtri(DC)) of the circuit shown and the power supply voltage VDD, because the rise time of high-frequency noise is fast, the transient trigger module is triggered, thereby triggering the thyristor SCR, so when the noise is at the holding voltage (V hold ) and the DC trigger voltage (Vtri(DC)), the thyristor SCR turns on causing a large leakage

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