Question

Problem 1. Understanding the Multiplexer (5 points) Below on the left is the logic symbol for a 4:1 Multiplexer (MUX). You can copy this symbol to make logic diagram later in the post-lab report. On the right is the 4:1 MUX IC Pinout (same diagram is on second page of ic_diagrams.pdf). DO 1G- 10 16 VDD S1 2 15 2G D1 Y 1D3 3 14 SO D2 1D2 4 13 2D3 Two 4:1 Multiplexers D3:0: data 1D1 5 12 2D2 S1:0: select D3 1D0 6 11 2D1 Y: output 1Y 7 10 2D0 Gb: enable GND 8 9 2Y S1 SO 74153 4:1 Mux Multiplexer Symbol for Logic Diagram IC Pinout Legend for IC Pinout 1.1 How many select bits are used for the 4:1 Mux? 1.2 Which select bit is the most significant bit? 1.3 Suppose S1 = 1, S0 = 0 and 1G = 0, then which signal will be assigned to output 1Y? 1.4 Now we still have S1 = 1, S0 = 0 but 1G = 1, then what will 1Y be? 1.5 Notice that we also have another set of inputs 2D and output 2Y. Explain how 2Y is related to 2D in one or two sentences.

          Problem 1. Understanding the Multiplexer (5 points)
Below on the left is the logic symbol for a 4:1 Multiplexer (MUX). You can copy this symbol to
make logic diagram later in the post-lab report. On the right is the 4:1 MUX IC Pinout (same
diagram is on second page of ic_diagrams.pdf).
DO
1G- 10
16 VDD
S1 2
15 2G
D1
Y
1D3 3
14 SO
D2
1D2 4
13 2D3
Two 4:1 Multiplexers
D3:0: data
1D1 5
12 2D2
S1:0: select
D3
1D0 6
11 2D1
Y: output
1Y 7
10 2D0
Gb: enable
GND 8
9 2Y
S1 SO
74153 4:1 Mux
Multiplexer Symbol
for Logic Diagram
IC Pinout
Legend for IC Pinout
1.1 How many select bits are used for the 4:1 Mux?
1.2 Which select bit is the most significant bit?
1.3 Suppose S1 = 1, S0 = 0 and 1G = 0, then which signal will be assigned to output 1Y?
1.4 Now we still have S1 = 1, S0 = 0 but 1G = 1, then what will 1Y be?
1.5 Notice that we also have another set of inputs 2D and output 2Y. Explain how 2Y is related to
2D in one or two sentences.

Problem 1. Understanding the Multiplexer (5 points)
Below on the left is the logic symbol for a 4:1 Multiplexer (MUX). You can copy this symbol to
make logic diagram later in the post-lab report. On the right is the 4:1 MUX IC Pinout (same
diagram is on second page of icdiagrams.pdf).
DO
1G- 10
16 VDD
S1 2
15 2G
D1
Y
1D3 3
14 SO
D2
1D2 4
13 2D3
Two 4:1 Multiplexers
D3:0: data
1D1 5
12 2D2
S1:0: select
D3
1D0 6
11 2D1
Y: output
1Y 7
10 2D0
Gb: enable
GND 8
9 2Y
S1 SO
74153 4:1 Mux
Multiplexer Symbol
for Logic Diagram
IC Pinout
Legend for IC Pinout
1.1 How many select bits are used for the 4:1 Mux?
1.2 Which select bit is the most significant bit?
1.3 Suppose S1 = 1, S0 = 0 and 1G = 0, then which signal will be assigned to output 1Y?
1.4 Now we still have S1 = 1, S0 = 0 but 1G = 1, then what will 1Y be?
1.5 Notice that we also have another set of inputs 2D and output 2Y. Explain how 2Y is related to
2D in one or two sentences.

Added by Eric B.

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