Patent ID: 9437591
Filing Date: 2016-09-06
CPC Classification: H01L

Claim Text:
1. A cross-domain electrostatic discharge protection device, comprising: a deep n-well formed in a substrate; a first p-well and a second p-well formed in the deep n-well; a first n-well formed in the deep n-well and between the first p-well and the second p-well, the first n-well contacting the first p-well and the second p-well; a first p-type doped region and a second p-type doped region formed in the first n-well; a third P-type doped region and a fourth P-type doped region respectively formed in the first p-well and the second p-well; a first n-type doped region formed in the first p-well and between the third and first p-type doped regions; and a second n-type doped region formed in the second p-well and between the second and fourth P-type region; wherein the first p-type doped region is connected to a first voltage supply of a first power domain, the third p-type doped region and the first n-type doped region are connected to a second voltage supply of the first power domain; wherein the second p-type doped region is connected to a third voltage supply of a second power domain, the fourth p-type doped region and the second n-type doped region are connected to a fourth voltage supply of the second power domain; and wherein the first and second power domains are different domains.