Low-voltage triggered PNP for ESD protection in mixed voltage I/O interface
AssigneeSilicon Integrated Systems Corp.
InventorsMing-Dou Ker, Wen-Yu Lo
Life of this patent
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Abstract
An low-voltage triggered PNP device for input signals with voltage level larger than VDD or less than VSS. The ESD protection device provides an ESD path from a first to a second node for protection of an internal circuit. The device comprises a substrate of a first conductivity type coupled to the first node, a first doped region of a second conductivity type in the substrate, wherein the first doped region is floated, a second doped region of the first conductivity type in the first doped region coupled to the second node, and a third doped region in the substrate, adjacent to the first doped region, to have a low trigger voltage.
Claims36
An ESD protection device for input signals with voltage level larger than VDD or less than VSS, which provides an ESD path from a first to a second node, the device comprising:
- a substrate of a first conductivity type coupled to the first node;
- a first doped region of a second conductivity type in the substrate, wherein the first doped region is floated;
- a second doped region of the first conductivity type in the first doped region, coupled to the second node;
- and
- a third doped region in the substrate, adjacent to the first doped region.
An ESD protection device for input signals with voltage level larger than VDD or less than VSS, which provides an ESD path from a first to a second node and the second to a third node, the device comprising:
- a substrate of a first conductivity type coupled to the first node;
- a first doped region of a second conductivity type in the substrate, wherein the first doped region is floated;
- a second doped region of the first conductivity type in the first doped region, coupled to the second node;
- a third doped region in the substrate, adjacent to the first doped region;
- and
- a fourth doped region of the first conductivity type in the first doped region, coupled to the third node.
Dependencies are inferred from the claim text.