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EE 231 Digital Electronics Fall 01 week 1-slide 1 Digital Hardware Systems Digital Systems Digital vs. Analog Waveforms Analog: values vary over a broad.

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Presentation on theme: "EE 231 Digital Electronics Fall 01 week 1-slide 1 Digital Hardware Systems Digital Systems Digital vs. Analog Waveforms Analog: values vary over a broad."— Presentation transcript:

1 EE 231 Digital Electronics Fall 01 week 1-slide 1 Digital Hardware Systems Digital Systems Digital vs. Analog Waveforms Analog: values vary over a broad range continuously Digital: only assumes discrete values +5 V –5 Time +5 V –5 101 Time

2 EE 231 Digital Electronics Fall 01 week 1-slide 2 Digital Hardware Systems Analog systems: slight error in input yields large error in output Digital systems more accurate and reliable Readily available as self-contained, easy to cascade building blocks Computers use digital circuits internally Interface circuits (i.e., sensors & actuators) often analog This course is about logic design, not system design (processor architecture), not circuit design (transistor level) Advantages of Digital Systems

3 EE 231 Digital Electronics Fall 01 week 1-slide 3 Digital Hardware Systems Physical electronic components are continuous, not discrete! These are the building blocks of all digital components! Transition from logic 1 to logic 0 does not take place instantaneously in real digital systems Intermediate values may be visible for an instant Boolean algebra useful for describing the steady state behavior of digital systems Be aware of the dynamic, time varying behavior too! The Real World +5 V 0 Logic 1 Logic 0 time

4 EE 231 Digital Electronics Fall 01 week 1-slide 4 Digital Hardware Systems Circuit that implements logical negation (NOT) 1 at input yields 0 at output 0 at input yields 1 at output - Inverter behavior as a function of input voltage - input ramps from 0V to 5V - output holds at 5V for some range of small input voltages then changes rapidly. remember distinction between steady state and dynamic behavior remember distinction between steady state and dynamic behavior V Out +5 0 V In Logic 1 Input Voltage V Out V In Logic 0 Input Voltage V IH V IL V OH V OL

5 EE 231 Digital Electronics Fall 01 week 1-slide 5 Digital Hardware Systems Algebra: variables, values, operations In Boolean algebra, the values are the symbols 0 and 1 If a logic statement is false, it has value 0 If a logic statement is true, it has value 1 Operations: AND, OR, NOT Boolean Algebra and Logical Operators

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