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Chapter 1

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  1. Chapter 1 Introduction: Digital Systems & Logic Design By Taweesak Reungpeerakul

  2. Digital Systems • Digital and Analog Quantities • Parameters of Pulse Waveform • Basic Logic • Combinational Logic • Digital Integrated Circuits • An example of Digital System • Design Flow 242-208 CH1

  3. 1.1 Digital & Analog Quantities • Analog Quantity? • Continuous Values • Digital Quantity? • Discrete Set of Values • Which one has more advantages? • Digital Quantity (process & transmit) • Efficiency • Reliability 242-208 CH1

  4. Analog & Digital Example 242-208 CH1

  5. Analog System Digital and Analog System Analog & Mixed System 242-208 CH1

  6. 1.2 Binary Digits, Logic Levels, and Digital Waveforms • Binary Digits: 0  Low, 1  High • Code: Group of Bits • Logic Level: represented by voltages 242-208 CH1

  7. Digital Waveforms • Pulse Positive-going pulse Negative-going pulse • Waveform Characteristic • Question f = 1/T T = 1/f tW : pulse width tr : rise time tf : fall time T : period f : frequency Duty Cycle = ( tw / T ) 100% 242-208 CH1

  8. Clock and Bits Waveforms • Clock is a periodic waveform (signal) in which each interval between pulse equals the time for one bit 242-208 CH1

  9. Timing Diagrams • How 2 or more waveforms change and relate 242-208 CH1

  10. 1.3 Basic Logic Operations 242-208 CH1

  11. 1.4 Basic Logic Functions 242-208 CH1

  12. Mux Demux Basic Logic Functions (cont) 2n n 242-208 CH1

  13. Flip-flops Counters Registers Basic Logic Functions (cont) 242-208 CH1

  14. 1.5 Digital Integrated Circuits • IC Packages: DIP, SMT, SOIC, PLCC, LCCC, FP • IC Complexity Classifications • SSI: gate ≥ 12, basic gates & flip-flops • MSI: 12 ≤ gate ≥ 99, logic functions • LSI: 100 ≤ gate ≥ 9999, including memory • VLSI: 10,000 ≤ gate ≥ 99,999 • ULSI: gate ≥ 100,000 242-208 CH1

  15. Integrated Circuit Technologies • Types of Transistors • Bipolar Junction Transistors • MOSFETs (metal-oxide semiconductor field-effect transistors) • Bipolar used in: transistor-transistor logic (TTL) and emitter-couple logic (ECL) • MOSFETs used in: complementary MOS (CMOS) and n-channel MOS (NMOS) 242-208 CH1

  16. 1.6 Testing and Troubleshooting Instruments • Oscilloscope • Analog • Digital • Logic Analyzer • DC Power Supply • Function Generator • Digital Multimeter 242-208 CH1

  17. 1.7 Digital System Application 242-208 CH1

  18. Design Flow 242-208 CH1