Circuit and Truth Table of a basic CMOS inverter. Figure 1 ( repeated from Part 1 of this four-part series) shows a basic CMOS inverter.įIGURE 1. The most basic element in any digital IC family is the digital inverter. This final episode explains the operating principles of these 4000- and 74-series CMOS devices, and describes CMOS basic usage rules. The advantages of this new ‘fast’ CMOS were so great that in 1994, it overtook TTL in popularity within the 74-series, finally making CMOS the most popular of all modern digital IC technologies. This new family was not as fast as the TTL technology then in use in the rival ‘74’-series of digital ICs, but in the mid 1980s, a new high-speed type of CMOS was developed and introduced as a new member of the 74 family of devices. In 1972, practical CMOS arrived on the commercial scene in the form of a brand-new medium-speed family of digital ICs known as the ’4000’-series. They are simple and inexpensive, consume near-zero quiescent current, have a very high input impedance, can operate over a wide range of supply voltages, have excellent noise immunity, and are very easy to use. CMOS (Complementary-symmetry MOSFET) digital IC elements have major advantages over TTL types. One of the most important events in the history of digital electronics was the development of the new IC technology known as CMOS in 1969.
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