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Display interfacing: A binary number can be converted to a 7-segment display pattern by using a(n) ________.

Difficulty: Easy

Correct Answer: decoder

Explanation:


Introduction / Context:
Seven-segment displays require segment control signals (a–g). Converting a binary code (often BCD) into segment lines is a classic display-interface problem.


Given Data / Assumptions:

  • Input: binary/BCD code for a digit.
  • Output: seven segment control lines.
  • Goal: identify the digital block that performs this mapping.


Concept / Approach:
A decoder maps an encoded input into a set of outputs; a BCD-to-7-segment decoder asserts the correct segment lines for each digit. An encoder does the reverse (many inputs to coded output).


Step-by-Step Solution:

Step 1: Recognize the direction: code → many segment lines.Step 2: This is a decode operation.Step 3: Choose “decoder.”


Verification / Alternative check:
Standard ICs like 7447/7448 (TTL) are BCD-to-7-segment decoders/drivers, confirming the mapping role.


Why Other Options Are Wrong:

Encoder: Opposite direction (many lines to fewer coded bits).Multiplexer: Selects one of many inputs to a single output; not direct code-to-segment mapping.Magnitude comparator: Compares numbers; does not generate segment codes.Priority encoder: Still an encoder, not a decoder.


Common Pitfalls:
Confusing encoder vs. decoder directionality.


Final Answer:
decoder

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