1. Logic Devices

2. Decoder

3. 2-to-4 Decoder

4. 3-to-8 Decoder

5. Implementation of a full adder with a decoder

7. Encoder

8. 4-to-2 Encoder

9. 8-to-3 Encoder

10. Multiplexers

11. 2 to 1 line multiplexer 4 to 1 line multiplexer

12. Demultiplexers

13. 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.

14. 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.

15. 3. EAROM= Electrically alterable ROM This ROM can be erased with electrical signals instead of uv light.

16. 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.

17. Block diagram of PLA

18. Thank you