Adjustable maintaining voltage type electronic static discharge protecting circuit

Abstract

The invention relates to the field of electronic static discharge (ESD) protecting circuits of integrated circuit chips, and in particular relates to an instantaneously-triggered and adjustable maintaining voltage type ESD protecting circuit. The adjustable maintaining voltage type electronic static discharge protecting circuit comprises an instantaneous triggering module, a release device controlled silicon and a maintaining voltage regulating module; the maintaining voltage regulating module is connected with the controlled silicon and comprises a resistor R2, a capacitor C2, an inverter INV1, a PMOS (P-channel Metal Oxide Semiconductor) Mp1 and a PMOS MP2. With the adoption of the adjustable maintaining voltage type electronic static discharge protecting circuit, the maintaining voltage can be kept to be greatly less than the power supply voltage when then chip is in an idle state, and thus the electronic static charge can be fully released; when the chip is in a working state, the maintaining voltage is more than the power supply voltage to avoid the latch-up effect.

Description

technical field [0001] The invention relates to the field of electrostatic discharge (Electronic Static Discharge, ESD) protection circuits for integrated circuit chips, in particular to an ESD protection circuit using transient triggering and adjustable sustain voltage. Background technique [0002] In order to obtain faster chip operating speed, smaller integration area, smaller operating voltage and lower power consumption, the process feature size of integrated circuits has been continuously reduced. At the same time, the gate oxide layer of the device is getting thinner and thinner, resulting in a smaller breakdown voltage. Integrated circuit chips will inevitably suffer from electrostatic shocks during manufacturing, packaging, and work. In a very short period of time, a large amount of charge will be transferred to the corresponding pins of the chip. If a large amount of charge cannot be discharged in time, the high voltage will cause damage and malfunction of the in...

AI Technical Summary

Problems solved by technology

However, the trigger voltage triggered by the thyristor SCR itself is as high as tens of volts, and the maintenance voltage is often lower than the chip operating power supply voltage V DD , which will potentially cause latch-up problems

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