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Logic Families

  • John Watson
Chapter
Part of the Macmillan Master Series book series (PAMAS)

Abstract

Although there are many ways of making integrated circuits, and several technologies are available to the manufacturer, two major ‘families’ of general-purpose logic ICs remain the most important. The first, and the oldest, family is TTL; TTL stands for Transistor-Transistor Logic, this logic family having replaced the older — now obsolete — DTL (Diode-Transistor Logic). The second logic family is CMOS (pronounced ‘sea-moss’) which stands for Complementary Metal-Oxide Semiconductor. Both families include a very large number of different devices: gates, flip-flops, counters, registers and many other ‘building-block’ elements. In many cases there are direct substitutes, but, as we shall see, it is not usually sensible to mix devices from the two families.

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Copyright information

© John Watson 1996

Authors and Affiliations

  • John Watson

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