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Digital Electronics: Principles, Devices and Applications

Digital Electronics: Principles, Devices and Applications

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126 <strong>Digital</strong> <strong>Electronics</strong>+VCC+VCCR 3IIL R 1Q3D1Q1IOLQ2Q4Driving GateDriven Gate(a)+VCC+VCCR2R3D1R 1Q 1Q2Q3IOHIIHQ4Driving GateDriven Gate(b)Figure 5.7(a) Current sinking action <strong>and</strong> (b) current sourcing action.5.3.1.2 Totem-Pole Output StageTransistors Q 3 <strong>and</strong> Q 4 constitute what is known as a totem-pole output arrangement. In such anarrangement, either Q 3 or Q 4 conducts at a time depending upon the logic status of the inputs. Thetotem-pole arrangement at the output has certain distinct advantages. The major advantage of using

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