Multiplexer is a combinational circuit that has maximum of 2" data inputs, 'n' selection lines and single output line. One of these data inputs will be connected to the output based on the values of selection lines. Since there are 'n' selection lines, there will be 2" possible combinations of zeros and ones. So, each combination will select only one data input. 8x1 Multiplexer has four data inputs D7, D6, Ds, D4, D3, D2, D1 & Do, three selection lines S2, S1 & So and one output Y. . One of these 8 inputs will be connected to the output based on the combination of inputs present at these three selection lines. So S S Do- D. D Dy D Ds Do D 8X1 Multiplexer Figure. Block Diagram of 8 line to 1 line Multiplexer 21 S 0 0 0 0 1 Select Data Inputs S 1 1 1 0 0 1 1 0 0 So 0 1 0 1 0 1 1 0 1 Output Y Do D D D D Ds D6 D Table: Truth Table of 8 to 1 Multiplexer Hardware Implementation (Procedure): The 74151 IC provides a 8-line to 1-line multiplexer in a single package. This 8x1 Multiplexer has eight data inputs D7(12). De(13). Ds(14), D4(15), D3(1), D2(2), D1(3) & Do(4), three selection lines s2(9), s1(10) & s0(1) and one output Y(5). One of these 8 inputs will be connected to the output based on the combination of inputs present at these three selection lines. Pin 7 is the enable and it is connected to ground. The pinout and functional output table from the 74151 datasheet are provided below. a) Find the pin diagram for the 74151 (Pin diagram has been provided). b) Apply VCC-+5V and ground to the appropriate pins (Connect pin 8 to ground and pin 16 to VCC). Connect the circuit according to circuit diagram above. c) You need to connect output pin 5 (Y) to a 330 ohm resistor, and the other end of the 330 ohm resistor will be connected to the positive terminal of LED. Finally, the negative terminal of the LED will connect to ground (OV). If the output is logic 1, LED will turn ON and if the output is logic 0, LED will turn OFF. d) Test all possible combinations of inputs, as listed in Table 1-1. Apply a logic 1 (connecting to VCC) and a logic 0 by connecting directly to ground. Tabulate your results in Table 1. Se S S Do D. D D3 D De EN 11 10 9 15 14 13 12 VCC=+5V 16 8X1 Multiplexer GND 330 ohm LED Figure. Connection Diagram Testing: Check each input (select) combinations. Two examples have been provided. S2-0, S1-0 & So-0: For the following combinations S2-0, S1-0 & So-0, Do will be connected to the output line Y. If Do-0 (Connecting to ground), output will be 0 (turn OFF the LED). If Do-1 (Connecting to VCC-+5V), output will be 1 (turn ON the LED). S2-1, S1-0 & So-0: For the following combinations S2-1, S1-0 & So-0, D4 will be connected to the output line Y. If D4-0 (Connecting to ground), output will be 0 (turn OFF the LED). If D4-1 (Connecting to VCC-+5V), output will be 1 (turn ON the LED). Name: Objective: Do Di D D3 1 1 Select Data Inputs S S 0 0 0 0 0 1 1 1 1 D4 Ds Table 1 1 0 0 1 1 0 0 1 1 So 0 1 0 1 Reconnect the breadboard for following data inputs 10110110 and select inputs S2-1, Si=1 & So-0, determine the output logic and measure the output voltage (Table 2). Table 2 0 1 0 1 Output D6 D7 S2 Si 0 So 0 Output Measured. (Y) Voltage (Y) h Multiplexer is a combinational circuit that has maximum of 2" data inputs, 'n' selection lines and single output line. One of these data inputs will be connected to the output based on the values of selection lines. Since there are 'n' selection lines, there will be 2" possible combinations of zeros and ones. So, each combination will select only one data input. 8x1 Multiplexer has four data inputs D7, D6, Ds, D4, D3, D2, D1 & Do, three selection lines S2, S1 & So and one output Y. . One of these 8 inputs will be connected to the output based on the combination of inputs present at these three selection lines. So S S Do- D. D Dy D Ds Do D 8X1 Multiplexer Figure. Block Diagram of 8 line to 1 line Multiplexer 21 S 0 0 0 0 1 Select Data Inputs S 1 1 1 0 0 1 1 0 0 So 0 1 0 1 0 1 1 0 1 Output Y Do D D D D Ds D6 D Table: Truth Table of 8 to 1 Multiplexer Hardware Implementation (Procedure): The 74151 IC provides a 8-line to 1-line multiplexer in a single package. This 8x1 Multiplexer has eight data inputs D7(12), De(13). Ds(14), D4(15), D3(1), D2(2), D1(3) & Do(4), three selection lines s2(9), sl(10) & s0(1) and one output Y(5). One of these 8 inputs will be connected to the output based on the combination of inputs present at these three selection lines. Pin 7 is the enable and it is connected to ground. The pinout and functional output table from the 74151 datasheet are provided below. a) Find the pin diagram for the 74151 (Pin diagram has been provided). b) Apply VCC-+5V and ground to the appropriate pins (Connect pin 8 to ground and pin 16 to VCC). Connect the circuit according to circuit diagram above. c) You need to connect output pin 5 (Y) to a 330 ohm resistor, and the other end of the 330 ohm resistor will be connected to the positive terminal of LED. Finally, the negative terminal of the LED will connect to ground (OV). If the output is logic 1, LED will turn ON and if the output is logic 0, LED will turn OFF. d) Test all possible combinations of inputs, as listed in Table 1-1. Apply a logic 1 (connecting to VCC) and a logic 0 by connecting directly to ground. Tabulate your results in Table 1. Se S S Do D. D D3 D De EN 11 10 9 15 14 13 12 VCC=+5V 16 8X1 Multiplexer GND 330 ohm LED Figure. Connection Diagram Testing: Check each input (select) combinations. Two examples have been provided. S2-0, S1-0 & So-0: For the following combinations S2-0, S1-0 & So-0, Do will be connected to the output line Y. If Do-0 (Connecting to ground), output will be 0 (turn OFF the LED). If Do-1 (Connecting to VCC-+5V), output will be 1 (turn ON the LED). S2-1, S1-0 & So-0: For the following combinations S2-1, S1-0 & So-0, D4 will be connected to the output line Y. If D-0 (Connecting to ground), output will be 0 (turn OFF the LED). If D4-1 (Connecting to VCC-+5V), output will be 1 (turn ON the LED). Name: Objective: Do Di D D3 1 1 Select Data Inputs S S 0 0 0 0 0 1 1 1 1 D4 Ds Table 1 1 0 0 1 1 0 0 1 1 So 0 1 0 1 Reconnect the breadboard for following data inputs 10110110 and select inputs S2-1, Si=1 & So-0, determine the output logic and measure the output voltage (Table 2). Table 2 0 1 0 1 Output D6 D7 S2 Si 0 So 0 Output Measured. (Y) Voltage (Y) h Multiplexer is a combinational circuit that has maximum of 2" data inputs, 'n' selection lines and single output line. One of these data inputs will be connected to the output based on the values of selection lines. Since there are 'n' selection lines, there will be 2" possible combinations of zeros and ones. So, each combination will select only one data input. 8x1 Multiplexer has four data inputs D7, D6, Ds, D4, D3, D2, D1 & Do, three selection lines S2, S1 & So and one output Y. . One of these 8 inputs will be connected to the output based on the combination of inputs present at these three selection lines. So S S Do- D. D Dy D Ds Do D 8X1 Multiplexer Figure. Block Diagram of 8 line to 1 line Multiplexer 21 S 0 0 0 0 1 Select Data Inputs S 1 1 1 0 0 1 1 0 0 So 0 1 0 1 0 1 1 0 1 Output Y Do D D D D Ds D6 D Table: Truth Table of 8 to 1 Multiplexer Hardware Implementation (Procedure): The 74151 IC provides a 8-line to 1-line multiplexer in a single package. This 8x1 Multiplexer has eight data inputs D7(12). De(13), Ds(14), D4(15), D3(1), D2(2), D1(3) & Do(4), three selection lines s2(9), sl(10) & s0(1) and one output Y(5). One of these 8 inputs will be connected to the output based on the combination of inputs present at these three selection lines. Pin 7 is the enable and it is connected to ground. The pinout and functional output table from the 74151 datasheet are provided below. a) Find the pin diagram for the 74151 (Pin diagram has been provided). b) Apply VCC-+5V and ground to the appropriate pins (Connect pin 8 to ground and pin 16 to VCC). Connect the circuit according to circuit diagram above. c) You need to connect output pin 5 (Y) to a 330 ohm resistor, and the other end of the 330 ohm resistor will be connected to the positive terminal of LED. Finally, the negative terminal of the LED will connect to ground (OV). If the output is logic 1, LED will turn ON and if the output is logic 0, LED will turn OFF. d) Test all possible combinations of inputs, as listed in Table 1-1. Apply a logic 1 (connecting to VCC) and a logic 0 by connecting directly to ground. Tabulate your results in Table 1. Se S S Do D. D D3 D De EN 11 10 9 15 14 13 12 VCC=+5V 16 8X1 Multiplexer GND 330 ohm LED Figure. Connection Diagram Testing: Check each input (select) combinations. Two examples have been provided. S2-0. S1-0 & So-0: For the following combinations S2-0, S1-0 & So-0, Do will be connected to the output line Y. If Do-0 (Connecting to ground), output will be 0 (turn OFF the LED). If Do-1 (Connecting to VCC-+5V), output will be 1 (turn ON the LED). S2-1, S1-0 & So-0: For the following combinations S2-1, S1-0 & So-0, D4 will be connected to the output line Y. If D-0 (Connecting to ground), output will be 0 (turn OFF the LED). If D4-1 (Connecting to VCC-+5V), output will be 1 (turn ON the LED). Name: Objective: Do Di D D3 1 1 Select Data Inputs S S 0 0 0 0 0 1 1 1 1 D4 Ds Table 1 1 0 0 1 1 0 0 1 1 So 0 1 0 1 Reconnect the breadboard for following data inputs 10110110 and select inputs S2-1, Si=1 & So-0, determine the output logic and measure the output voltage (Table 2). Table 2 0 1 0 1 Output D6 D7 S2 Si 0 So 0 Output Measured. (Y) Voltage (Y) h