Chapter 6. Functions of Combinational Logic. Adder. Figure 6--1 Logic symbol for a half-adder. Figure 6--2 Half-adder logic diagram. Figure 6--3 Logic symbol for a full-adder. Figure 6--4 Full-adder logic. Figure 6--5 Full-adder implemented with half-adders.
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Functions of Combinational Logic
Figure 6--34 Basic logic diagram of a decimal-to-BCD encoder. A 0-digit input is not needed because the BCD outputs are all LOW when there are no HIGH inputs.
Figure 6--35 Pin diagram and logic symbol for the 74HC147 decimal-to-BCD priority encoder (HPRI means highest value input has priority).