To investigate the demultiplexer For this exercise you will need the following components and equipment: 1 - 74LS139 ic (dual 1-of-4 demultiplexer) 1 - +5 V dc power supply 4 - LED (5 mm) and series resistor (270 Ω) The pin connection diagram for the 74139 ic is shown in Figure 9.13. For each circuit there is one enable (EN) and two channel select (A,B) inputs, and four ([latex]O_0[/latex] to [latex]O_3[/latex]) outputs. When the enable input is logic 1, all four outputs are logic 1, irrespective of the logic level of the select inputs. When the enable input is logic 0, the selected output will be logic 0, with all other outputs remaining at logic 1. The enable is used as the data input.

1 Connect up the circuit of Figure 9.14. 2 Work through and complete the truth table shown in Figure 9.15.

Question 9.PE.3: To investigate the demultiplexer For this exercise you will ...

Practical Digital Electronics for Technicians

To investigate the demultiplexer
For this exercise you will need the following components and equipment:

1 – 74LS139 ic (dual 1-of-4 demultiplexer)
1 – +5 V dc power supply
4 – LED (5 mm) and series resistor (270 Ω)
The pin connection diagram for the 74139 ic is shown in Figure 9.13.

For each circuit there is one enable (EN) and two channel select (A,B) inputs, and four ( $O_0$ to $O_3$ ) outputs.

When the enable input is logic 1, all four outputs are logic 1, irrespective of the logic level of the select inputs.
When the enable input is logic 0, the selected output will be logic 0, with all other outputs remaining at logic 1.
The enable is used as the data input.

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