CMOS is a logic design style using combinations of PMOS and NMOS transistors, such that only one transistor of each pair can switch states at a time. Under DC or low frequency conditions, this logic design style allows steady state current to dissipate only through leakage. Relatively large power is dissipated only during transistor switching at mid- to high-frequencies when there are brief periods where both types of devices are on simultaneously.

CMOS chips are extensively used in computer systems because of their low power consumption. They can also operate over a very wide range of supply voltages. However they're susceptible to damage by static electricity and care is required when handling them. [ABT, AC, ACT, BCT, HC, HCT, TTL