Electrostatic discharge protection circuit
First Claim
1. An electrostatic discharge protection circuit comprising:
- a first transistor formed on a semiconductor substrate adjacent to one side of an insulation oxide film region, for transferring a voltage from a first voltage terminal to an output terminal in response to a first input signal;
a second transistor formed on said semiconductor substrate adjacent to the other side of said insulation oxide film region, for transferring a voltage from a second voltage terminal to said output terminal in response to a second input signal; and
an NPN transistor having its collector connected to said first voltage terminal, its emitter connected to said output terminal and its base connected to a bulk region of said second transistor.
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Abstract
An electrostatic discharge protection circuit comprising a first transistor formed on a semiconductor substrate adjacently to one side of an insulation oxide film region, for transferring a voltage from a first voltage terminal to an output terminal in response to a first input signal, a second transistor formed on the semiconductor substrate adjacently to the other side of the insulation oxide film region, for transferring a voltage form a second input signal, and an NPN transistor having its collector connected to the first voltage terminal, its emitter connected to the output terminal and its base connected to a bulk region of the second transistor. According to the present invention, when a semiconductor device is exposed to electrostatic discharge, the electrostatic discharge protection circuit discharges charges introduced by the electrostatic discharge before they are discharge through an internal circuitry. Therefore, due to the electrostatic discharge, the internal circuitry can be prevented from being damaged.
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Citations
16 Claims
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1. An electrostatic discharge protection circuit comprising:
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a first transistor formed on a semiconductor substrate adjacent to one side of an insulation oxide film region, for transferring a voltage from a first voltage terminal to an output terminal in response to a first input signal; a second transistor formed on said semiconductor substrate adjacent to the other side of said insulation oxide film region, for transferring a voltage from a second voltage terminal to said output terminal in response to a second input signal; and an NPN transistor having its collector connected to said first voltage terminal, its emitter connected to said output terminal and its base connected to a bulk region of said second transistor. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An electrostatic discharge protection circuit comprising:
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a first transistor formed on a semiconductor substrate adjacent to one side of an insulation oxide film region, for transferring a voltage from a first voltage terminal to an output terminal in response to a first input signal; a second transistor formed on said semiconductor substrate adjacent to the other side of said insulation oxide film region, for transferring a voltage from a second voltage terminal to said output terminal in response to a second input signal; and an NPN transistor having its emitter connected to said second voltage terminal, its collector connected to said output terminal and its base connected to a bulk region of said second transistor. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An electrostatic discharge protection circuit comprising:
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a first transistor formed on a semiconductor substrate adjacent to one side of an insulation oxide film region, for transferring a voltage from a first voltage terminal to an output terminal in response to a first input signal; a second transistor formed on said semiconductor substrate adjacent to the other side of said insulation oxide film region, for transferring a voltage from as second voltage terminal to said output terminal in response to a second input signal; and an NPN transistor having its collector connected to said first voltage terminal, its emitter connected to said second voltage terminal and its base connected to a bulk region of said second transistor. - View Dependent Claims (14, 15, 16)
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Specification