Patent ID: 9048098
Filing Date: 2015-06-02
Classification: H01L

Abstract:
1. An electrostatic discharge protection device, comprising: a P-type substrate set as floating; a first common N-well formed in the P-type substrate; a first common N-doped region formed in the first common N-well; a first common P-doped region formed in the first common N-well; a second common N-well formed in the P-type substrate; a second common N-doped region formed in the second common N-well, wherein the second common N-doped region is electrically connected to a reference voltage node; a second common P-doped region formed in the second common N-well; a third common P-doped region formed between the first common N-well and the second common N-well on the P-type substrate, wherein the third common P-doped region is electrically connected to the first common N-doped region and the second common P-doped region; and a plurality of peripheral N-wells formed in the P-type substrate, each of the peripheral N-wells comprising a P-type doped region and a N-type doped region, wherein the P-type doped region is electrically connected to one of a plurality of I/O terminals, and the N-type doped region is electrically connected to the first common P- doped region and a bus.