数电第三章逻辑门(logicgatas)原版英文教材辅助课件

CH3 LOGIC GATES,Logical operation2. Application3. Troubleshooting of logic gates4. Waveforms,Chapter overview,The standard logic symbol,3-1 The Inverter,Distinctive shape symbols,Rectangular outline symbols,The negation indicators,The polarity indicators,2. Truth table,3. Operation4. Timing diagram5. Logic expression:6. Application example: 1s complement circuit,1. The standard logic symbol,A,B,X,3-2 The And Gate,Distinctive shape,3. AND Operation,If inputs A and B are HIGH, output X is HIGH; If either A or B is LOW, or if both A and B are LOW, X is LOW,4. Truth table,Table 3-2 Truth table for a 2-input AND gate,3. Pulsed Operation,Omission(P105,e.g. 3-3),A,B,X,X=AB Or,4. Logic expression,Boolean multiplication,5. Application example,The AND Gate as an Enable/Inhibit Device Fig. 3-15 p108,1. The standard logic symbol,3-3 The OR Gate,Rectangular outline,Distinctive shape symbol,2. Logical Operation,if either input A or B is HIGH, output X is HIGH if both A and B are HIGH; X is HIGH if both A and B are LOW, X is low .,3. Truth table,4. Pulsed Operation,5. Logic expression,X=A+B,Boolean addition is the same as the OR function,4. Application example,Fig. 3-24Intrusion detection and alarm system,The NAND is a universal gate ,It can be used in combination to perform the AND, OR, and inverter operations.,3-4 The NAND Gate,The standard logic symbol,Rectangular outline symbol,The standard logic symbolLogical OperationTruth tablePulsed OperationLogic expression (Omisssion),3-5 The NOR Gate,3-6 The EXCLUSIVE-OR and EXCLUSIVE-NOR Gates,The standard logic symbol,CMOS: Complementary Metal-Oxide Semiconductor Widely used in VLSI, ULSI,3-7 Integrated circuit logic gates,CMOS and TTL are the most widely used IC technologies, ECL is used in more specialized applications,4000,74HC 74HCT,74VHC 74VHCT,速度慢与TTL不兼容抗干扰功耗低,74LVC 74AUC,速度加快与TTL兼容负载能力强抗干扰功耗低,速度两倍于74HC与TTL兼容负载能力强抗干扰功耗低,低(超低)电压速度更加快与TTL兼容负载能力强抗干扰功耗低,2. TTL: Transistor-Transistor LogicUsed in MSI, LSI,74LS series,74 series,74AS series,74ALS