Complementary metal–oxide–semiconductor (CMOS), also known as complementary-symmetry metal–oxide–semiconductor (COS-MOS), is a type of metal–oxide–semiconductor field-effect transistor (MOSFET) fabrication process that uses complementary and symmetrical pairs of p-type and n-type MOSFETs for logic functions. Characteristics of CMOS Logic Families. The 4000A CMOS family has been replaced by its high-voltage versions in the 4000B and 4000UB CMOS families, with the former having buffered and the latter having unbuffered outputs. 54/74C, 54/74HC, 54/74HCT, 54/74AC and 54/74ACT are CMOS logic families with pin-compatible 54/74 TTL series logic functions. MOS family are PMOS, NMOS family, CMOS family. It has excellent noise immunity amongst all families. Now the Bi-MOS logic family is the one that uses both bipolar and MOS devices. The propagation delay is the worst when compared with TTL and ECL families at about 200ns. CMOS supports a very large fan-out, more than 50 transistors.

Of the above mentioned families DL, RTL and DTL are not used these days they have become obsolete. CMOS technology is used for constructing integrated circuit (IC) … The members of other logic family i.e. A logic low voltage for CMOS is about; A logic high voltage for ECL is somewhere between 4.5V to 5V. TTL, CMOS, ECL, NMOS and Bi-CMOS are the families which are still used.