what is the difference of saturating and non-saturating logic family?

Answer 1

The transistors in saturating logic circuits (e.g., TTL) are driven with a relatively high base current in the conducting state, to reduce the collector-to-emitter voltage drop and thereby dissipate minimum power, and to make the opertaing point independent of transistor current gain. Nonsaturating logic circuits such as ECL and CML claim higher speeds than saturating logic because transistors that are not in saturation can change state faster than those operating in saturation.