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Logic Devices
Decoder
• A decoder is a combinational circuit that
converts binary information from n inputs to
2 𝑛
unique output lines.
...
2-to-4 Decoder
3-to-8 Decoder
Implementation of a full adder with a
decoder
Encoder
• An encoder has 2 𝑛
input lines and n output
lines.
4-to-2 Encoder
8-to-3 Encoder
Multiplexers
• A multiplexer is a combinational circuit that
selects binary information from one of many
input lines and d...
Multiplexers
2 to 1 line multiplexer 4 to 1 line multiplexer
Demultiplexers
• It has one input line, n selection lines and 2 𝑛
output lines.
ROM
• ROM= Read Only Memory
• It is a device that includes both decoder and
OR gates.
• It consists of n input lines and m...
Types of ROMs
1. PROM= Programmable read only memory
when ordered, PROM units contain all 0’s or
all 1’s.
2. EPROM= Erasab...
3. EAROM= Electrically alterable ROM
This ROM can be erased with electrical signals
instead of uv light.
Programmable Logic Array(PLA)
• A programmable logic array (PLA) is a kind of
programmable logic device used to implement
...
Block diagram of PLA
Thank you
Combinational Logic with MSI and LSI
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Combinational Logic with MSI and LSI

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Decoder, Encoder, Multiplexer, Demultiplexer, ROM, PLA

Publié dans : Ingénierie
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Combinational Logic with MSI and LSI

  1. 1. Logic Devices
  2. 2. Decoder • A decoder is a combinational circuit that converts binary information from n inputs to 2 𝑛 unique output lines. If input=2, output=4 If input=3, output=8
  3. 3. 2-to-4 Decoder
  4. 4. 3-to-8 Decoder
  5. 5. Implementation of a full adder with a decoder
  6. 6. Encoder • An encoder has 2 𝑛 input lines and n output lines.
  7. 7. 4-to-2 Encoder
  8. 8. 8-to-3 Encoder
  9. 9. Multiplexers • A multiplexer is a combinational circuit that selects binary information from one of many input lines and directs it to a single output line. • The selection of a particular input line is controlled by a set of selection lines. Normally. there are 2 𝑛 input lines and II selection lines
  10. 10. Multiplexers 2 to 1 line multiplexer 4 to 1 line multiplexer
  11. 11. Demultiplexers • It has one input line, n selection lines and 2 𝑛 output lines.
  12. 12. ROM • ROM= Read Only Memory • It is a device that includes both decoder and OR gates. • It consists of n input lines and m output lines.
  13. 13. Types of ROMs 1. PROM= Programmable read only memory when ordered, PROM units contain all 0’s or all 1’s. 2. EPROM= Erasable PROM when an EPROM is placed under a special uv light for a given period of time, the short- wave radiation discharges the internal gates that serve as contacts. After erase, the ROM returned to its initial state.
  14. 14. 3. EAROM= Electrically alterable ROM This ROM can be erased with electrical signals instead of uv light.
  15. 15. Programmable Logic Array(PLA) • A programmable logic array (PLA) is a kind of programmable logic device used to implement combinational logic circuits. • The PLA has a set of programmable AND gate planes, which link to a set of programmable OR gate planes, which can then be conditionally complemented to produce an output.
  16. 16. Block diagram of PLA
  17. 17. Thank you

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