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Electrostatic discharge protection circuit

An electrostatic discharge protection, electrostatic discharge technology, applied in circuits, electrical components, electrical solid devices, etc., can solve problems such as occupying more layout area

Active Publication Date: 2016-09-21
MACRONIX INT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the added guard ring structure can assist the one or more diodes to successfully achieve the intended purpose, it may take up a lot of layout area to provide the guard ring structure itself and the additional layout spacing.

Method used

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  • Electrostatic discharge protection circuit
  • Electrostatic discharge protection circuit
  • Electrostatic discharge protection circuit

Examples

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Embodiment Construction

[0107] What is described below are the illustrated embodiments of the present invention and the attached drawings, and are used to describe the present invention more fully in various exemplifying ways. The various illustrations presented should be viewed as a whole and should not be taken out of context or intended to limit the scope of protection of the present invention. The disclosed content is for those skilled in the art to fully understand. The word "or" used in the specification is a linking term, which may be "and / or". Additionally, the article "a" or "an" may be considered singular or plural. The term "coupled" or "connected" can mean that components are connected directly or indirectly through other components.

[0108] image 3 It is used to represent a schematic diagram of an equivalent circuit of an ESD protection circuit 1 according to an embodiment described in the present disclosure. The circuit 1 described above can be incorporated into a semiconductor cir...

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PUM

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Abstract

An electrostatic discharge protection circuit is connected between a first pad and a second pad. On a normal operation state, voltage applied to the first pad is higher than that applied to the second pad. The electrostatic discharge protection circuit comprises a substrate in a first conduction type, a first trap, a rotating folding device and a diode string, wherein the first trap is located in the substrate and is in a second conduction type, and the first trap is coupled with the first pad; the rotating folding device is surrounded by the first trap; the diode string is located in the substrate, is in serial connection with the rotating folding device and is separated from the first trap, and the diode string and the rotating folding device are in serial connection and are connected between the first pad and the second pad. By means of isolation of the first trap, on the condition that a protection ring is not used, retaining voltage of the electrostatic discharge protection circuit can be adjusted by means of adjustment of the number of diodes in the diode string.

Description

technical field [0001] The invention relates to an electrostatic discharge protection circuit, in particular to an electrostatic discharge protection circuit capable of adjusting holding voltage. Background technique [0002] Protecting internal circuits from electrostatic discharge has always been a challenge for those skilled in the art. A snapback device is a type of device commonly used in ESD protection circuits. When excessive electrical stress occurs, the snapback device exhibits its snapback characteristic. figure 1 Shown is a current-voltage graph for a snap device with snap characteristics. Such as figure 1 As shown, when the cross voltage of the transition device is lower than the trigger voltage (trigger voltage) Vtrig, the transition device will maintain the cutoff (cutoff) state, and when the cross voltage rises to the trigger voltage Vtrig, the PN junction in the transition device will enter into cumulative collapse The state triggers the parasitic BJT tran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L27/02
Inventor 何介暐许杞安俞军军郝晗
Owner MACRONIX INT CO LTD