初学者——数电基本知识.ppt

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1、逻辑门,3-1 The Inverter/ The NOT Gate（非门） 3-2 The AND Gate（与门） 3-3 The OR Gate（或门） 3-4 The NAND Gate（与非门） 3-5 The NOR Gate（或非门） 3-6 The Exclusive-OR Gate（异或门） 3-7 The Exclusive-NOR Gate（同或门）,3-1 The Inverter (The NOT Gate)反相器(非门),The output of an inverter is always the complement (opposite) of the inpu

2、t.,Truth table:真值表 Boolean expression:布尔(逻辑)表达式,IEEE: Institute of Electrical and Electronics Engineers 国际电气和电子工程师协会,ANSI: American National Standards Institute 美国国家标准协会,Symbol,NOT Gate,Rules of boolean Algebra:,Figure 32 Inverter operation with a pulse input. Open file F03-02 to verify inverter ope

3、ration.,Figure 33 Timing diagram for the case in Figure 32.,a timing diagram shows how or more waveform relate in time.,Figure 34 Determine the output corresponding to the input and show the diagram.,Thomas L. FloydDigital Fundamentals, 9e,Copyright 2006 by Pearson Education, Inc.Upper Saddle River,

4、 New Jersey 07458All rights reserved.,Figure 36 The inverter complements an input variable.,Thomas L. FloydDigital Fundamentals, 9e,Copyright 2006 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458All rights reserved.,Figure 37 Example of a 1s complement circuit using inverters.,3-2 The

5、AND Gate与门,The output of an AND gate is HIGH only when all inputs are HIGH. Else it is low.,X = AB = AB = AB,Timing diagram,AND Gate with multiple inputs,The AND Gate truth table,0 0=0 0 1=0 1 0=0 1 1=1,Operation rules,Figure 39 All possible logic levels for a 2-input AND gate. Open file F03-09 to v

6、erify AND gate operation.,Thomas L. FloydDigital Fundamentals, 9e,Copyright 2006 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458All rights reserved.,Key words ignition switch 点火开关 seat belt=safety belt 安全带 audible 可听见的，音响的 Timer 计时器 buckle 皮带扣,Figure 316 A simple seat belt alarm circu

7、it using an AND gate.,An Application-提醒扣紧安全带的装置,Figure 310 Example of AND gate operation with a timing diagram showing input and output relationships.,Thomas L. FloydDigital Fundamentals, 9e,Copyright 2006 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458All rights reserved.,Figure 315

8、An AND gate performing an enable/inhibit function for a frequency counter.,enable 使能，使能端,erform：履行，完成 inhibit ：抑制，阻止,寄存器 译码器 频率显示器,Figure 372,Thomas L. FloydDigital Fundamentals, 9e,Copyright 2006 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458All rights reserved.,3-3 The OR Gate 或门,T

9、he output of an OR gate is HIGH whenever one or more inputs are HIGH, Else it is low.,OR gate with multiple inputs,0+0=0 0+1=1 1+0=1 1+1=1,Operation rules,Figure 320 Example of OR gate operation with a timing diagram showing input and output time relationships.,Thomas L. FloydDigital Fundamentals, 9

10、e,Copyright 2006 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458All rights reserved.,Figure 323 Boolean expressions for OR gates with two, three, and four inputs.,Figure 324 A simplified intrusion detection system using an OR gate.,3-4 The NAND Gate与非门,The output of a NAND gate is HIG

11、H whenever one or more inputs are LOW. 与非逻辑：条件A、B、C都具备，则F 不发生。,3-5 The NOR Gate或非门,The output of a NOR gate is LOW whenever one or more inputs are HIGH. 或非：条件A、B、C任一具备，则F 不发生。,Application:油箱液位报警电路,indication:指示,表示,Application:液位报警电路,Application飞机“起落架”的状态显示电路,extend:伸展 retract:缩回,Figure 329 Standard

12、symbols representing the two equivalent operations of a NAND gate.,Figure 337 Standard symbols representing the two equivalent operations of a NOR gate.,Thomas L. FloydDigital Fundamentals, 9e,Copyright 2006 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458All rights reserved.,3-6 Exclu

13、sive-OR 异或门,The output of an XOR gate is HIGH whenever the two inputs are different. 异或逻辑：条件A、B有一个具备，另一个不具备则F 发生。,3-7 Exclusive-NOR Gate 同或门,The output of an XNOR gate is HIGH whenever the two inputs are identical. 同或：条件A、B相同，则F 发生。,Figure 361 Pin configuration diagrams for some common fixed-functio

14、n IC gate configurations.,Thomas L. FloydDigital Fundamentals, 9e,Copyright 2006 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458All rights reserved.,Figure 365 The partial data sheet for a 74LS00.,Thomas L. FloydDigital Fundamentals, 9e,Copyright 2006 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458All rights reserved.,