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Step 1 of 2 4.029E The internal realization of a TTL NOR gate is shown in Figure 1. VCC R1 R2 K3 Q1 04 OUTPUT B D1 D2 R4 Figure1: Internal realization of a TTL NOR gate Step 2 of 2 The logic symbol more closely to the intemal realization of a TTL NOR gate is AND gate with inverted inputs. As shown in figure, the two inputs are given to invertor and inverted inputs are connected to AND gate. The inverter of a TTL realization is shown in dotted line (green color).