ELECTROSTATIC PROTECTION CIRCUIT
First Claim
1. An electrostatic protection circuit, comprising:
- a first trigger circuit connected between a first power supply terminal and a second power supply terminal and configured to output a first trigger signal;
a second trigger circuit connected between the first power supply terminal and the second power supply terminal, in parallel with the first trigger circuit, and configured to output a second trigger signal;
a first buffer circuit configured to output a first drive signal in response to the first trigger signal;
a second buffer circuit configured to output a second drive signal in response to the second trigger signal; and
a first switch circuit and a second switch circuit connected in series between the first and second power supply terminals,wherein a conduction state of the first switch circuit is controlled by the first drive signal, and a conduction state of the second switch circuit is controlled by the second drive signal.
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Accused Products
Abstract
According to one embodiment, an electrostatic protection circuit includes a first trigger circuit that is connected between a first power supply terminal and a second power supply terminal, and a second trigger circuit. The circuit includes a first buffer circuit that outputs a drive signal in response to a trigger signal of the first trigger circuit, and a second buffer circuit that outputs a drive signal in response to a trigger signal of the second trigger circuit. A shunt circuit includes a first switch circuit and a second switch circuit connected in series between the first and second power supply terminals. A conduction of the first switch circuit is controlled by a drive signal of the first buffer circuit, and a conduction of the second switch circuit is controlled by a drive signal of the second buffer circuit.
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Citations
20 Claims
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1. An electrostatic protection circuit, comprising:
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a first trigger circuit connected between a first power supply terminal and a second power supply terminal and configured to output a first trigger signal; a second trigger circuit connected between the first power supply terminal and the second power supply terminal, in parallel with the first trigger circuit, and configured to output a second trigger signal; a first buffer circuit configured to output a first drive signal in response to the first trigger signal; a second buffer circuit configured to output a second drive signal in response to the second trigger signal; and a first switch circuit and a second switch circuit connected in series between the first and second power supply terminals, wherein a conduction state of the first switch circuit is controlled by the first drive signal, and a conduction state of the second switch circuit is controlled by the second drive signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An electrostatic protection circuit, comprising:
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a first switch and second switch connected in series between two nodes; a first trigger circuit and second trigger circuit configured to control, respectively, the first switch and the second switch to provide a closed circuit path between the two nodes upon occurrence of an ESD event and to maintain an open circuit path otherwise. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A method for protecting a circuit, the method comprising:
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generating a first trigger signal according to a first time constant; generating a second trigger signal according to a second time constant, the second time constant being shorter than the first time constant; and closing a circuit path based on the first trigger and the second trigger when the duration of an event is about the same time as the first time constant; and maintaining the circuit path in open state otherwise. - View Dependent Claims (19, 20)
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Specification