A CMOS design to achieve high drivability is examined for lower power supply voltage in 0.5 µm ULSI. The design consists of two points. (1) A very narrow (50 nm) sidewall is used to achieve high drivability and also to obtain hot-carrier-reliability. (2) A retrograded channel profile with NMOS and PMOS is designed to achieve high drivability and also to reduce short channel effect. It is shown that the propagation delay times (tpd) of a unloaded Inverter and a loaded 2-way NAND gate are improved 30% with the newly designed CMOS, compared with the conventionally designed CMOS. It is also proved that the tpd keeps the scaling trend of the previous-5 V-era even in 3.3 V-era by adapting the newly designed CMOS. Moreover, 7.1 ns multiplication time of 1616-bit multiplier is obtained under 0.5 µm design rule.