Physics · Digital Electronics
A digital designer aims to construct a 1×8 demultiplexer with select lines S2, S1, and S0 using one 1×2 and two 1×4 demultiplexer Integrated Circuits (ICs). Which of the following configurations correctly realizes this design using a tree structure?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Use two 1×4 demultiplexers at the first stage connected back-to-back, with the outputs combined into a single 1×2 demultiplexer stage.
- 2Use three 1×2 demultiplexers connected in parallel with all select lines tied together to create eight distinct outputs.
- 3Use one 1×2 demultiplexer at the first stage and two 1×4 demultiplexers at the second stage. S2 controls the first stage, while S1 and S0 control the second stage.✓
- 4Use one 1×4 demultiplexer at the first stage and two 1×2 demultiplexers at the second stage, with S0 controlling the first stage.
Correct answer
Use one 1×2 demultiplexer at the first stage and two 1×4 demultiplexers at the second stage. S2 controls the first stage, while S1 and S0 control the second stage.
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