COE202lesson9 - Practical Aspects of Logic Gates...

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Practical Aspects of Logic Gates Introduction & Objectives Logic gates are physically implemented as Integrated Circuits (IC). Integrated circuits are implemented in several technologies. Two landmark IC technologies are the TTL and the CMOS technologies. Major physical properties of a digital IC depend on the implementation technology. In this lesson, the following major properties of digital IC’s are described: 1. Allowed physical range of voltages for logic 0 and logic 1, 2. Gate propagation delay/ speed, 3. The fanin and fanout of a gate, 4. The use of buffers, and 5. Tri-State drivers Allowed Voltage Levels Practically, logic 0 is represented by a certain RANGE of Voltages rather than by a single voltage level. .In other words, if the voltage level of a signal falls in this range, the signal has a logic 0 value. Likewise, logic 1 is represented by a different RANGE of valid voltages. The range of voltages between the highest logic 0 voltage level and the lowest logic 1 voltage level is an “Illegal Voltage Range”.
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  • Fall '13
  • Sait
  • Logic, Logic gate, output voltage, input voltage, VIH

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