METHODS OF DESIGNING LAYOUTS OF SEMICONDUCTOR DEVICES

A method of designing a layout of a semiconductor device includes determining from among a plurality of integrated circuit (IC) blocks in the semiconductor device a selection IC block for which a layout is to be changed, changing an spacing interval at which fin structures included in the selection IC block are spaced apart from each other in a first direction from a first spacing interval to a second spacing interval, and determining in the selection IC block locations of source/drain regions connected to the fin structures spaced apart from each other in the first direction at the second spacing interval.