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Demultiplexers Module M6.4 Section 6.4
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Demultiplexers YIN 1 x 4 DeMUX d0d1 Y0 Y1 Y2 Y3 Y0 Y1 Y2 Y3 d1d0 0 0 YIN 0 0 0 0 1 0 YIN 0 0 1 0 0 0 YIN 0 1 1 0 0 0 YIN
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Demultiplexers YIN 1 x 4 DeMUX d0d1 Y0 Y1 Y2 Y3 Y0 Y1 Y2 Y3 d1d0 0 0 YIN 0 0 0 0 1 0 YIN 0 0 1 0 0 0 YIN 0 1 1 0 0 0 YIN 0
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Demultiplexers YIN 1 x 4 DeMUX d0d1 Y0 Y1 Y2 Y3 Y0 Y1 Y2 Y3 d1d0 0 0 YIN 0 0 0 0 1 0 YIN 0 0 1 0 0 0 YIN 0 1 1 0 0 0 YIN 0 1
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Demultiplexers YIN 1 x 4 DeMUX d0d1 Y0 Y1 Y2 Y3 Y0 Y1 Y2 Y3 d1d0 0 0 YIN 0 0 0 0 1 0 YIN 0 0 1 0 0 0 YIN 0 1 1 0 0 0 YIN 1 0
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Demultiplexers YIN 1 x 4 DeMUX d0d1 Y0 Y1 Y2 Y3 Y0 Y1 Y2 Y3 d1d0 0 0 YIN 0 0 0 0 1 0 YIN 0 0 1 0 0 0 YIN 0 1 1 0 0 0 YIN 1
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Demultiplexers YIN 1 x 4 DeMUX d0d1 Y0 Y1 Y2 Y3 Y0 Y1 Y2 Y3 d1d0 0 0 YIN 0 0 0 0 1 0 YIN 0 0 1 0 0 0 YIN 0 1 1 0 0 0 YIN Y0 = YIN & !d1 & !d0 Y1 = YIN & !d1 & d0 Y2 = YIN & d1 & !d0 Y3 = YIN & d1 & d0
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14demux.abl MODULE 14DeMux TITLE '1 to 4 DeMultiplexer, D. Hanna, 7/10/02‘ DECLARATIONS " INPUT PINS " YIN PIN 10;" Push Button for the input value d1..d0 PIN 6,7;" Switch 1,2 for the select lines " OUTPUT PINS " Y3..Y0 PIN 39,37,36,35 ISTYPE 'com';" LED 5..8
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14demux.abl (cont’d) EQUATIONS Y0 = YIN & !d1 & !d0; Y1 = YIN & !d1 & d0; Y2 = YIN & d1 & !d0; Y3 = YIN & d1 & d0; END 14DeMux
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Mux-DeMux Combination
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Y 4 x 1 MUX s0s1 C0 C1 C2 C3 Y0 Y1 Y2 Y3 1 x 4 DeMUX d0d1 YIN 0 1 1
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Mux-DeMux Combination Y 4 x 1 MUX s0s1 C0 C1 C2 C3 Y0 Y1 Y2 Y3 1 x 4 DeMUX d0d1 YIN 1 0 0
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Mux-DeMux Combination Y 4 x 1 MUX s0s1 C0 C1 C2 C3 Y0 Y1 Y2 Y3 1 x 4 DeMUX d0d1 YIN 0
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TTL Demultiplexer 1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 GND Vcc1C 1G B 1Y3 1Y2 1Y1 1Y0 2C 2G A 2Y3 2Y2 2Y1 2Y0 74LS155 1 X X X 1 1 1 1 0 1 0 0 0 1 1 1 0 1 0 1 1 0 1 1 0 1 1 0 1 1 0 1 0 1 1 1 1 1 1 0 X 0 X X 1 1 1 1 G C B A Y0 Y1 Y2 Y3 X = don’t care Dual 1-to-4-line demultiplexer
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