Appendix Lab 4 – Combinational Circuits Design
Appendix Lab 4
COMBINATIONAL CIRCUITS DESIGN
OBJECTIVE
 Understand how to use the Analog Discovery Studio kit.
 Understand how basic functional ICs work.
Department of Electronics
Digital System Design Laboratory
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Appendix Lab 4 – Combinational Circuits Design
FUNCTIONAL SCHEMATIC AND TRUTH TABLE OF SOME ICs
1. IC 74LS138: Decoder 3 to 8
Figure 1: Schematic of 74LS138
Table 1: Truth table of 74LS138
2. IC 74LS148: Encoder Priority 8 to 3
Table 2: Truth table of 74LS148
Department of Electronics
Digital System Design Laboratory
Figure 2: Schematic of 74LS148
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Appendix Lab 4 – Combinational Circuits Design
3. IC 74LS151: Multiplexer 8 to 1
Table 3: Truth table of 74LS151
Figure 3: Schematic of 74LS151
4. IC 74LS47: BCD to 7-Segment Decoder
Hình 4.1: Schematic of 74LS47
Figure 4.2: Schematic of 74LS47 (source: Internet)
Department of Electronics
Digital System Design Laboratory
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Appendix Lab 4 – Combinational Circuits Design
Table 4: Truth table of 74LS47
5. IC 74LS85: 4 bit comparator
Figure 5: Schematic of 74LS85
Department of Electronics
Digital System Design Laboratory
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Appendix Lab 4 – Combinational Circuits Design
Table 5: Truth table of 74LS85
6. IC 74LS83/ 74LS283: 4 bit Binary Adder with Fast Carry
Hình 6: Schematic of 74LS83
Department of Electronics
Digital System Design Laboratory
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Appendix Lab 4 – Combinational Circuits Design
Table 6: Truth table of 74LS283
Department of Electronics
Digital System Design Laboratory
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