Logic Families

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


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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© John Watson 1996

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  • John Watson

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