CHAPTER 2: APPLICATIONS OF LOGIC GATESINTEGRATED CIRCUITLogic gates are available as integrated circuits. The different manufacturers have standardized their numbering schemes so that the basic part numbers are the same regardless of the manufacturer. For example, Fig. 1(a) shows the gate systems available in integrated circuit 7408; it has four two-input AND gates and is supplied in a 14-pin package. Power supply connections are made to pins 7 and 14, these supplying the operating voltage for all four AND gates. In order to indicate at which end of the package pin 1 starts, notch is cut between pins 1 and 14. Integrated circuit 7411 has three AND gates which each having three inputs; integrated circuit 7421 has two AND gates with each having four inputs. Figure 1(b) shows the gate systems available in integrated circuit 7402. This has four two-input NOR gates in a 14-pin package, power connections being to pins 7 and 14. Integrated circuit 7427 has three gates with each having three inputs.
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