Patent ID: 9478505
Filing Date: 2016-10-25
CPC Classification: H01L

Claim Text:
1. A structure comprising: a seal ring surrounding a semiconductor device, the seal ring including seal ring cells, wherein the seal ring cells include first cells and second cells abutting one another, said first cells comprising a plurality of metal layers, each first cell including an outer ring portion and an inner portion, each outer ring portion having metal segments in the plurality of metal layers, each inner portion having metal vias in each of the plurality of metal layers, said first cells not coupled to ground, said second cells including an outer ring portion and an inner portion, each outer ring portion having metal segments in the plurality of metal layers, each inner portion having metal vias in fewer than all of the plurality of metal layers, each of said second cells having a respective metal lead extending therefrom and coupled to ground, the metal lead in one of the metal layers of the second cells without any metal vias, and further including corner cells at corners of the seal ring, wherein a sequence of abutting first cells and second cells extends an entire distance between at least two adjacent corner cells.