A semiconductor integrated circuit includes a unit cell array, a power trunk
line,
first power branch lines and second power branch lines. The unit cell array includes
logic unit cells for providing general circuits and clock unit cells for providing
clock drivers. The power trunk line is formed on a peripheral area of the unit
cell array. The power trunk line supplies a power source potential. The first power
branch lines are formed on the unit cell array for supplying the power source potential
to the logic unit cells. The first power branch lines are connected each other
and connected to the power trunk line. The second power branch lines are formed
on the unit cell array for supplying the power source potential to the clock unit
cells. The second power branch lines are connected each other and connected to
the power trunk line.
