Semiconductor integrated circuit
First Claim
Patent Images
1. A semiconductor integrated circuit, comprising:
- an external pad for input or output of a signal;
an internal circuit connected to the external pad;
a ground line supplied with a ground potential;
a first protection circuit which is connected to a connection path extending between the external pad and the internal circuit and which is provided between the external pad and the ground line; and
a second protection circuit which is connected to the connection path extending between the external pad and the internal circuit and which is provided between the external pad and the ground line,wherein the second protection circuit has a first protection element having an end connected to the external pad and a second protection element provided between the other end of the first protection element and the ground line, andthe second protection circuit further includes a first resistor provided between the other end of the first protection element and a power supply line for supplying a supply voltage.
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Abstract
A semiconductor integrated circuit includes an external pad, a ground line, a first protection circuit between the external pad and the ground line, and a second protection circuit between the external pad and the ground line. The second protection circuit is formed by a first protection element, a second protection element, and a resistor. With this structure, the resistance value of the resistor is set to an arbitrary value, so that an unnecessary current which would be generated at the time of power-off of the LSI can be decreased to a value which does not deteriorate the reliability of the LSI.
16 Citations
7 Claims
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1. A semiconductor integrated circuit, comprising:
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an external pad for input or output of a signal; an internal circuit connected to the external pad; a ground line supplied with a ground potential; a first protection circuit which is connected to a connection path extending between the external pad and the internal circuit and which is provided between the external pad and the ground line; and a second protection circuit which is connected to the connection path extending between the external pad and the internal circuit and which is provided between the external pad and the ground line, wherein the second protection circuit has a first protection element having an end connected to the external pad and a second protection element provided between the other end of the first protection element and the ground line, and the second protection circuit further includes a first resistor provided between the other end of the first protection element and a power supply line for supplying a supply voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification