Electrostatic discharge protection circuit
First Claim
1. An electrostatic discharge protection circuit coupled between an I/O pad and an internal circuit of an IC, the electrostatic discharge protection circuit comprising:
- a first diode having a positive end coupled to the I/O pad, and a negative end coupled to a first supply voltage;
a second diode having a positive end coupled to a second supply voltage, and a negative end coupled to the I/O pad; and
a third diode having a positive end coupled to the second supply voltage, and a negative end coupled to the first supply voltage;
wherein the breakdown voltage of the third diode is substantially smaller than the breakdown voltage of the first diode.
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Accused Products
Abstract
An electrostatic discharge protection circuit coupled between an I/O pad and an internal circuit of an IC. The electrostatic discharge protection circuit includes a first diode having a positive end coupled to the I/O pad, and a negative end coupled to a first supply voltage; a second diode having a positive end coupled to a second supply voltage, and a negative end coupled to the I/O pad; and a third diode having a positive end coupled to the second supply voltage, and a negative end coupled to the first-supply voltage. The breakdown voltage of the third diode is substantially smaller than the breakdown voltage of the first diode or the breakdown voltage of the second diode.
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Citations
16 Claims
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1. An electrostatic discharge protection circuit coupled between an I/O pad and an internal circuit of an IC, the electrostatic discharge protection circuit comprising:
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a first diode having a positive end coupled to the I/O pad, and a negative end coupled to a first supply voltage;
a second diode having a positive end coupled to a second supply voltage, and a negative end coupled to the I/O pad; and
a third diode having a positive end coupled to the second supply voltage, and a negative end coupled to the first supply voltage;
wherein the breakdown voltage of the third diode is substantially smaller than the breakdown voltage of the first diode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electrostatic discharge protection circuit coupled between an I/O pad and an internal circuit of an IC, the electrostatic discharge protection circuit comprising:
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a first diode having a positive end coupled to the I/O pad, and a negative end coupled to a first supply voltage;
a second diode having a positive end coupled to a second supply voltage, and a negative end coupled to the I/O pad; and
a third diode having a positive end coupled to the second supply voltage, and a negative end coupled to the first supply voltage;
wherein the breakdown voltage of the third diode is substantially smaller than the breakdown voltage of the second diode. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification