컴퓨터구조 Logic Device summary

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컴퓨터구조 Logic Device summary에 대한 보고서 자료입니다.

목차

3.1 Combinational Networks and Switching Algebra

3.2 Logic Circuits

3.3 Registers and Their Applications

3.4 Programmable Arrays

3.5 Arithmetic Logic Units

3.6 Programmable Logic
Logic Elements

79.1 IC Logic Family Operation and Characteristics

79.2 Logic Gates (IC)

79.3 Bistable Devices

79.4 Optical Devices

본문내용

.1 IC Logic Family Operation and Characteristics
Digital logic circuits can be classified as belonging to one of two categories, either combinational (also called
combinatorial) or sequential logic circuits. The output logic level of a combinatorial circuit depends only on
the current logic levels present at the circuit’\'s inputs. Sequential logic circuits, on the other hand, have a memory
characteristic so the sequential circuit’\'s output is dependent not only on the current input conditions but also
on the current output state of the circuit. The primary building block in combinational circuits is the logic
gate. The three simplest logic gate functions are the inverter (or NOT), AND, and OR. Other common basic
logic functions are derived from these three. Table 79.1 gives truth table definitions of the various types of
logic gates. The memory elements used to construct sequential logic circuits are called latches and flip-flops.
The integrated circuit switching logic used in modern digital systems will generally be from one of three
families: transistor-transistor logic (TTL), complementary metal-oxide semiconductor logic (CMOS), or emitter-
coupled logic (ECL). Each of the logic families has its advantages and disadvantages. The three major families
are also divided into various subfamilies derived from performance improvements in integrated circuit (IC) design technology. Bipolar transistors provide the switching action in both TTL and ECL families, while enhancement-mode MOS transistors are the basis for the CMOS family. Recent improvements in switching circuit performance are also attained using BiCMOS technology, the merging of bipolar and CMOS technologies
on a single chip. A particular logic family is usually selected by digital designers based on such criteria as
1. Switching speed
2. Power dissipation
3. PC board area requirements (levels of integration)
4. Output drive capability (fan-out)
5. Noise immunity characteristics
6. Product breadth
7. Sourcing of components
TTL Logic Family
트랜지스터 - 트랜지스터 논리(Transistor-Transistor logic : TTL)는 반도체를 이용한 논리 회로의 대표적인 하나이며 일반적으로 5V 단일 전원의 모노리식 집적 회로로 만들어 졌다. DTL의 개량품으로 1970년대에 텍사스 인스트루먼트 사의 표준 논리 IC 종류에 의해 널리 보급

키워드

logic,   devices,   Combinational Networks and Switching Algebra,   Logic Circuits,   Registers and Their Applications,   Programmable Arrays,   Logic Elements