Each of these logic families, TTL, ECL, PMOS, NMOS and CMOS, has a specific set of characteristics that make it desirable for certain applications.

• 每一种逻辑元件，晶体管一晶体管逻辑电路、发射极耦合逻辑电路f型金属氧化物半导体、N型金属氧化物半导体和补充金属氧化物半导体，都有其特有的性质，从而适用于不同的用途。