Electro-static discharge protection circuit and semiconductor device having the same
First Claim
1. An electrostatic protection circuit, comprising:
- a first thyristor rectifier circuit electrically coupled to an internal circuitry, an external source voltage supply line that supplies an external source voltage to the internal circuitry, and an internal fixed voltage supply line that supplies an internal fixed voltage to the internal circuitry;
a first current control circuit electrically coupled to the first thyristor rectifier circuit and an internal source voltage supply line that supplies an internal source voltage to the first internal circuitry, the first current control circuit restricting a current from flowing from the external source voltage supply line to the internal source voltage supply line through the first thyristor rectifier circuit when the external source voltage supply line becomes greater than the internal source voltage supply line, the first current control circuit making a surge current flow to the internal fixed voltage supply line through the first thyristor rectifier circuit by triggering the first thyristor rectifier circuit into a thyristor mode by means of the surge current applied to the external source voltage supply line in order to protect the first internal circuitry from the surge current.
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Accused Products
Abstract
An electro-static discharge protection circuit and a semiconductor device having the same is disclosed. The electro-static discharge protection circuit has a current control circuit. The current control circuit has a first capacitive element. When the external source voltage is applied to the external source voltage supply line, the booster circuit in the internal circuitry boosts the internal source voltage of the internal source voltage supply line. The external source voltage becomes transiently greater than the internal source voltage at the early stage of the boosting step when the booster circuit boosts the internal source voltage based on the external source voltage. The first capacitive element restricts a current from flowing from the second terminal of the thyristor rectifier circuit to the internal source voltage, even when the external source voltage becomes transiently greater than the internal source voltage at the early stage of the boosting step when the booster circuit boosts the internal source voltage based on the external source voltage. This prevents the thyristor rectifier circuit from malfunctioning and turning on.
4 Citations
16 Claims
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1. An electrostatic protection circuit, comprising:
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a first thyristor rectifier circuit electrically coupled to an internal circuitry, an external source voltage supply line that supplies an external source voltage to the internal circuitry, and an internal fixed voltage supply line that supplies an internal fixed voltage to the internal circuitry; a first current control circuit electrically coupled to the first thyristor rectifier circuit and an internal source voltage supply line that supplies an internal source voltage to the first internal circuitry, the first current control circuit restricting a current from flowing from the external source voltage supply line to the internal source voltage supply line through the first thyristor rectifier circuit when the external source voltage supply line becomes greater than the internal source voltage supply line, the first current control circuit making a surge current flow to the internal fixed voltage supply line through the first thyristor rectifier circuit by triggering the first thyristor rectifier circuit into a thyristor mode by means of the surge current applied to the external source voltage supply line in order to protect the first internal circuitry from the surge current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A semiconductor device, comprising:
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a first internal circuitry; an external source voltage supply line which supplies an external source voltage to the internal circuitry; an internal source voltage supply line which supplies an internal source voltage to the internal circuitry; an internal fixed voltage supply line which supplies an internal fixed voltage to the internal circuitry; at least one electrostatic protection circuit, each electrostatic protection circuit further comprising; a first thyristor rectifier circuit electrically coupled to the first internal circuitry, the external source voltage supply line, and the internal fixed voltage supply line; a first current control circuit electrically coupled to the internal source voltage supply line and the first thyristor rectifier circuit, the first current control circuit restricting a current from flowing from the external source voltage supply line to the internal source voltage supply line through the first thyristor rectifier circuit when the external source voltage supply line becomes greater than the internal source voltage supply line, the first current control circuit making a surge current flow to the internal fixed voltage supply line through the first thyristor rectifier circuit by triggering the first thyristor rectifier circuit into a thyristor mode by means of the surge current applied to the external source voltage supply line in order to protect the first internal circuitry from the surge current. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification