KR100976411B1 - Electrostatic discharge circuit - Google Patents
Electrostatic discharge circuit Download PDFInfo
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- KR100976411B1 KR100976411B1 KR20080049871A KR20080049871A KR100976411B1 KR 100976411 B1 KR100976411 B1 KR 100976411B1 KR 20080049871 A KR20080049871 A KR 20080049871A KR 20080049871 A KR20080049871 A KR 20080049871A KR 100976411 B1 KR100976411 B1 KR 100976411B1
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- diffusion region
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- ground voltage
- input
- voltage terminal
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Abstract
The electrostatic discharge circuit of the present invention includes a first diffusion region formed in a first type well and a second type well adjacent to each other and the first type well, to which an input / output pad connected to an internal circuit is connected, and the first type well and the second well. A second diffusion region formed across the interface of the wells and connected to a power supply voltage pad and a third diffusion region formed in the second type well and connected to a ground voltage pad and a third diffusion region in the second type well; And a capacitor having one end connected to the fourth diffusion region and the second diffusion region formed to be isolated from the second diffusion region, and a third diffusion region connected to the other end.
Description
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semiconductor device, and more particularly, to an electrostatic discharge circuit used to prevent a phenomenon in which a defect occurs in a semiconductor device due to an electrostatic discharge phenomenon caused by static electricity.
In general, semiconductor chips may be subject to static electricity stored in themselves or in devices to be mounted. Accordingly, mass-produced semiconductor chips include electrostatic discharge circuits on data input / output pads and power pads of the semiconductor element to protect the semiconductor element from static electricity.
As such an electrostatic discharge circuit, a diode, a metal oxide scilicon (MOS) device, a bipolar junction transistor device (BJT), a silicon voltage controlled rectifier (Low Voltage Scilicon Controlled Rectifier (LVTSCR)) is widely used.
The dual diode has advantages of large extinguishing ESD current and small junction capacitance per unit area, but has a problem in that the operation resistance is large and its use is limited.
Morse devices have lower triggering voltage and lower operating resistance, but the ESD current that can be extinguished per unit area is smaller than 1/3 or 1/5 of diode or LVTSCR. As a result, there is a problem in that the junction capacitor becomes large using a large area.
On the other hand, LVTSCR has many advantages of extinguishing ESD current, small junction capacitance and small operating resistance per unit area.However, it is difficult to cope with high-speed and low-voltage circuits because of high and unstable operation trigger voltage when ESD transistor occurs. there is a problem.
1 is a diagram showing an electrostatic discharge circuit of a semiconductor device according to the prior art. Referring to FIG. 1, the
The two
When external static electricity is generated and input to an input / output pin (not shown), a voltage generated from the
The
On the other hand,
However, in order to lower the triggering voltage,
The present invention provides an electrostatic discharge circuit for efficiently discharging static electricity introduced into input / output pads and power pads from the outside.
In addition, the present invention provides an electrostatic discharge circuit capable of protecting the internal circuit connected to the input / output pad by quickly discharging the static electricity flowing into the input / output pad and the power pads.
In addition, the present invention provides an electrostatic discharge circuit for improving the area efficiency while implementing a fast operation in the electrostatic discharge circuit using the LVTSCR circuit.
The electrostatic discharge circuit of the present invention comprises a first type well and a second type well adjacent to each other; A first diffusion region formed in the first type well and connected to an input / output pad connected to an internal circuit; A second diffusion region formed at an interface between the first type well and the second type well and connected to a power supply voltage pad; A third diffusion region formed in the second type well and connected to a ground voltage pad; A fourth diffusion region formed in the second type well so as to be isolated from a third diffusion region; And a capacitor having one end connected to the second diffusion region and the third diffusion region connected to the other end.
It is preferable that the first type well is an N well region and the second type well is a P well region.
The first and fourth diffusion regions are P-type impurities, and the second and third diffusion regions are N-type impurities.
In addition, it is preferable to configure an NMOS transistor having the second and third diffusion regions as a drain and a source and a gate additionally provided between the second and third diffusion regions, and a gate connected to the ground voltage terminal.
The display device may further include a diode connected between the input / output pad and the ground voltage pad.
The electrostatic discharge circuit of the present invention is configured between a power supply voltage terminal and a ground voltage terminal, and discharges static electricity by an inflow of static electricity from an input terminal connected to an input / output pad connected to an internal circuit, and induces an amount of static electricity flowing into the input terminal. And controlling the connection between the power supply voltage terminal and the ground voltage terminal to control the discharge, the LVTSCR circuit and a capacitor connected between the power supply voltage terminal and the ground voltage terminal and stabilizing the potential of the power supply voltage terminal. do.
The LVTSCR circuit may include a PNP bipolar transistor and a resistor connected in series between the input terminal and the ground voltage terminal; And an NPN bipolar transistor configured between the ground voltage terminal and the power supply voltage terminal, wherein the PNP bipolar transistor and the NPN bipolar transistor are coupled to each other by a base and a collector.
In the NPN bipolar transistor, a parasitic NMOS transistor in which a source and a drain are covalently coupled is preferably formed in parallel.
In addition, the capacitor unit is preferably composed of a capacitor using a capacitor or a MOS transistor in which the source and the drain are connected in bulk.
Further, by further connecting a diode between the input / output pad and the ground voltage terminal, a negative electrostatic current flowing into the input / output pad may be discharged.
The electrostatic discharge circuit according to the present invention can stably protect the internal circuit of the semiconductor device from static electricity by lowering the operation start voltage of the LVTSCR circuit for discharging static electricity.
In addition, the electrostatic discharge circuit according to the present invention can increase the area efficiency by using an internal circuit to lower the operation start voltage of the transistor element.
The present invention proposes an electrostatic discharge circuit for quickly operating an LVTSCR circuit and increasing the area efficiency of the LVTSCR circuit to protect internal circuits connected to the input / output pad and the power pad from static electricity.
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
2 is a cross-sectional view showing the LVTSCR structure of the present invention, Figure 3 is an equivalent circuit diagram corresponding to FIG.
Referring to FIG. 2, the
In detail, when a positive electrostatic current flows into the input / output pad I / O, the electrostatic current flows from the emitter of the
Here, the
In addition, the
The electrostatic current, which is the base current of the
Accordingly, the
The
Conventionally, since two transistor elements and a resistance element are provided to supply a triggering current to an LVTSCR circuit, the area consumed in terms of layout in a chip has a large disadvantage.
In order to compensate for this, the electrostatic discharge circuit of the present invention can drive the
Referring to the cross-sectional view of the
P-type
In the
The
The
The
The
Next, the operation of the LVTSCR of the present invention will be described.
When an electrostatic current flows into the I / O pad, the electrostatic current initially in an AC state has a fast signal rising time of 10 ns. Flow through the base of the PNP
In addition, the AC current rapidly triggers the operation of the PNP
In addition, the AC current is a voltage corresponding to the AC current *
Afterwards, the NPN
Thus, unlike the conventional LVTSCR circuit of FIG. 2 operating when the conventional LVTSCR circuit of FIG. 1 reaches the avalanche breakdown voltage of the NP junction, the electrostatic alternating current induced by the
Thus, the LVTSCR circuit of the present invention operates at a much lower voltage than conventional LVTSCR circuits.
Meanwhile, the
The
In the related art, since two transistor elements and resistance elements are provided to supply a triggering current to an LVTSCR circuit, a large area is occupied in terms of layout in a chip.
4 is a circuit diagram of the
The
The
Since the configuration and operation of the electrostatic discharge circuit including the
5 is a result of simulating the effect of lowering the driving voltage of the LVTSCR circuit in the capacitor configured as the electrostatic discharge circuit of the present invention to drive the LVTSCR circuit.
Increasing the capacitance of the capacitor from 0.01pF to 1nF, it can be seen that the initial operating voltage decreases from 5.3V to 1.7V.
The present invention configured as described above has the advantage that it is possible to secure the chip area more than the existing technology without the need for additional devices while operating the LVTSCR circuit, ESD protection device fast.
1 is a conventional electrostatic discharge circuit diagram.
2 is an electrostatic discharge circuit diagram of the present invention.
3 is a cross-sectional view of an electrostatic discharge circuit of the present invention.
4 is an electrostatic discharge circuit diagram of another embodiment of the present invention.
5 is a simulation diagram of the electrostatic discharge circuit of the present invention.
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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KR20080049871A KR100976411B1 (en) | 2008-05-28 | 2008-05-28 | Electrostatic discharge circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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KR20080049871A KR100976411B1 (en) | 2008-05-28 | 2008-05-28 | Electrostatic discharge circuit |
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KR20090123676A KR20090123676A (en) | 2009-12-02 |
KR100976411B1 true KR100976411B1 (en) | 2010-08-17 |
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KR20080049871A KR100976411B1 (en) | 2008-05-28 | 2008-05-28 | Electrostatic discharge circuit |
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Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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KR102410020B1 (en) * | 2015-12-21 | 2022-06-22 | 에스케이하이닉스 주식회사 | ESD protection device having a low trigger voltage |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20050067508A (en) * | 2003-12-29 | 2005-07-05 | 주식회사 하이닉스반도체 | Circuit for protecting electrostatic discharge |
KR20060038604A (en) * | 2004-10-30 | 2006-05-04 | 주식회사 하이닉스반도체 | Circuit for protecting electrostatic discharge in semiconductor device |
KR20060086715A (en) * | 2005-01-27 | 2006-08-01 | 삼성전자주식회사 | Semiconductor device having esd protection circuit |
KR20070071465A (en) * | 2005-12-30 | 2007-07-04 | 주식회사 하이닉스반도체 | Electrostatic discharge protection circuit |
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2008
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Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20050067508A (en) * | 2003-12-29 | 2005-07-05 | 주식회사 하이닉스반도체 | Circuit for protecting electrostatic discharge |
KR20060038604A (en) * | 2004-10-30 | 2006-05-04 | 주식회사 하이닉스반도체 | Circuit for protecting electrostatic discharge in semiconductor device |
KR20060086715A (en) * | 2005-01-27 | 2006-08-01 | 삼성전자주식회사 | Semiconductor device having esd protection circuit |
KR20070071465A (en) * | 2005-12-30 | 2007-07-04 | 주식회사 하이닉스반도체 | Electrostatic discharge protection circuit |
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