Decoders

Decoder is a combinational circuit that decodes the data from n input lines to 2^n outputs. Figure shows the blocks of 2-to-4,
3-to-8 and 4-to-16 decoders. Here, if three inputs are available in the decoder eight outputs will be available in the decoder which is known as 3-to-8 decoder.

Decoder QUIZ:

1. A decoder circuit does not have the __input

  select

  data

  select control

2. A decoder can be used as a Demultiplexer by ________.

  a)tying all enable pins LOW
tying all data-select lines LOW
tying all data-select lines HIGH
using the input lines for data selection and an enable line for data input

  b)tying all data-select lines LOW

  c)tying all data-select lines HIGH

  d)using the input lines for data selection and an enable line for data input

3. 1. How many 3-line-to-8-line decoders are required for a 1-of-32 decoder?

  a)1

  b)2

  c) 4

  d) 8

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