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Digital Components

Digital Components. Lecture 16. Digital Components. To understand the organization and design of digital computers, it is very important to be familiar with the various digital components widely used .

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Digital Components

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  1. Digital Components Lecture 16

  2. Digital Components To understand the organization and design of digital computers,it is very important to be familiar withthe various digital components widely used. Digital components means digital circuits, and digital circuits are constructed with integrated circuits.

  3. Integrated Circuits Name No. Gates Usage SSI (Small-scale integration) 10 Gates MSI (Medium-scale integration) Decoders, adders, registers 10 - 200 LSI (Large-scale integration) 200 - few thousands Processors, Memory chips VLSI (Very Large-scale integration) Complex microcomputer Thousands - A small silicon semiconductor device, called a chip, containing electronic components for the gates connected by wires. 14 to 1000 or more pins Numeric designation printed on surface of the package Vendors publish data books or catalogues

  4. Digital Logic Family FYI. • TTL (Transistor- Transistor Logic) • Bipolar transistor based circuits • ECL (Emitter- Coupled Logic) • High-speed digital circuits: Supercomputers, signal processors • MOS (Metal-Oxide Semiconductor) • Unipolar transistor (Bipolar Tr.: TTL, ECL) • NMOS (n-channel MOS) & PMOS (p-channel MOS) • CMOS (Complementary MOS) • PMOS & NMOS connected in complementary fashion • High-packing density than bipolar • Simpler processing technique than bipolar • Economical operation due to low-power

  5. In This Class We stay at “logic” level which is independent of circuit technology. We now review most popular digital components which will be essential for your mini-CPU in near future.

  6. Decoder n-to-mdecoder is a combinational circuit thatconverts n coded inputs to a maximum of m=2n unique outputs

  7. Decoder with Enable

  8. Multiplexor (MUX)

  9. Register

  10. Register Inside

  11. Register with Parallel Load

  12. Register with Parallel Load & Clear

  13. Shift Register

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