A semiconductor device includes a first block coupled between a first latch node and a second latch node, a second block suitable for generating common-mode noise between the first latch node and the second latch node, wherein the second block includes a first MOS transistor having a gate coupled with the first latch node, and one between a source and a drain of the first MOS transistor is coupled with the second latch node while the other between the source and the drain is floating.