Standard cell libraries and integrated circuit including standard cells

A standard cell library including at least one first standard cell having a first cell height and at least two second standard cells, each second standard cell having a second cell height, the standard cell library comprising:

• a first power rail extending in a first direction;
• a second power rail extending in the first direction, the second power rail being spaced apart from the first power rail in a second direction that is perpendicular to the first direction;
• and
• a third power rail extending in the first direction between the first power rail and the second power rail;
• the first standard cell arranged between the first power rail and the second power rail, the first cell height being defined by a spacing between the first and second power rails, and being electrically connected to the third power rail;
• the second standard cells being arranged between the first power rail and the second power rail, in contact with each other in the second direction and being in contact with the first standard cell in the first direction, the second cell height being defined by a spacing between the first and third power rails or by a spacing between the third and second power rails.

An integrated circuit (IC) including at least one first standard cell having a first cell height and at least two second standard cells, each second standard cell having a second cell height, the first standard cell and the second standard cells being formed on a substrate of the IC, the IC comprising:

• a first power rail extending in a first direction over the substrate;
• a second power rail extending in the first direction, the second power rail being spaced apart from the first power rail by a predetermined spacing in a second direction perpendicular to the first direction;
• and
• a third power rail extending in the first direction between the first power rail and the second power rail;
• the first standard cell being arranged between the first power rail and the second power rail, the first cell height being defined by a spacing between the first and second power rails;
• the second standard cells being arranged between the first power rail and the second power rail, in contact with each other in the second direction and being in contact with the first standard cell in the first direction, the second cell height being defined by a spacing between the first and third power rails or by a spacing between the third and second power rails.