Topic: Digital Logic
How many 3 to 8 line decoders are required for a 1 of 32 decoder?
- A. 1
- B. 2
- C. 4
- D. 8
Answer: C. 4
Explanation: A 1-of-32 (or 5-to-32) decoder has 32 output lines. A 3-to-8 line decoder has 8 output lines. To provide 32 outputs, we require exactly $32 / 8 = 4$ of these 3-to-8 line decoders in the final output stage. (Note: These 4 decoders are driven by the 2 most significant bits using their enable pins or an additional 2-to-4 decoder, but the primary question asks for the number of 3-to-8 decoders to generate the 32 lines).