Figure 3-34. Logic packages.
As mentioned before, logic families are identified by the elements used and the manner in which the
elements are used. A brief description of some of the more common logic families follows.
RTL (RESISTOR-TRANSISTOR LOGIC)
In this type of logic, inputs are applied to resistors, and the output is produced by a transistor. RTL is
normally constructed from discrete components (individual resistors and transistors). Some circuits are
manufactured as integrated circuits and packaged in modified transistor outline (TO) packages, as shown
in figure 3-35. An in-depth coverage of circuit packaging can be found in NEETS, Module 14,
Introduction to Microelectronics.