LOGIC FAMILIES AND GATES

Logic Families

The types of logic devices are classified in "families", of which the most important are TTL and CMOS. The main families are:

• TTL(Transistor-Transistor Logic), made of bipolar transistors.



• CMOS(Complementary Metal Oxide Semiconductor) made from MOSFETs



• ECL (Emitter Coupled Logic) for extremely high speeds



• NMOS, PMOS for VLSI large scale integrated circuits.

Logic Gates

AND

OR

XOR

NAND

NOR

XNOR

BUFFER

INVERTER BUFFER OR SIMPLY, INVERTER

TRUTH TABLE FOR ALL GATES