Double-mode electro-static discharge protection IO circuit
A technology for electrostatic discharge protection and circuit protection. It is applied in the direction of static electricity, circuits, and electrical components. It can solve problems such as breakdown failure, electrostatic discharge damage, and device electrostatic breakdown failure.
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[0014] The present invention is a dual-mode electrostatic discharge protection I / O circuit, which can not only realize the protection of HBM discharge, but also provide protection for E-Gun model discharge. The implementation plan is as follows:
[0015] like figure 2 , is the discharge path when the I / O circuit E-Gun model of the present invention discharges. Take I / O-GND forward 2000V electrostatic discharge as an example, at this time, GND is grounded, and positive charge electrostatic discharge is performed on I / O PAD.
[0016] First, the NESD202 of the primary protection will be turned on and discharged, forming a figure 2 The high-current discharge path from PAD to GND through 202 is one of the main electrostatic discharge paths. At this time, the voltage at the PAD terminal will exceed 10V, so the secondary protection NMOS205 will also be turned on, clamping the core circuit to GND at a safe level, and at the same time, due to the function of the input protection re...
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