Chapter 3 Logic Gates By Taweesak Reungpeerakul 241
Chapter 3 Logic Gates By Taweesak Reungpeerakul 241 -208 CH 3 1
Contents n n n n 241 -208 CH 3 Inverter AND Gate OR Gate NAND Gate NOR Gate XOR and XNOR Gates Integrated Circuit Logic Gates 2
3. 1 Inverter (INV) n n 241 -208 CH 3 Symbols Truth Table In Out 0 1 1 0 n n Timing Diagram 0 1 1 0 Logic Expression: Out = In 3
3. 2 AND Gate 241 -208 CH 3 n Symbols n Truth Table A 0 0 1 1 B 0 1 n Out 0 0 0 1 n Timing Diagram Logic Expression: Out = AB 4
3. 3 OR Gate 241 -208 CH 3 n Symbols n Truth Table A 0 0 1 1 B 0 1 n Out 0 1 1 1 n Timing Diagram Logic Expression: Out = A+B 5
3. 4 NAND Gate 241 -208 CH 3 n Symbols n Truth Table A 0 0 1 1 B 0 1 n Out 1 1 1 0 n Timing Diagram Logic Expression: Out = AB 6
3. 5 NOR Gate 241 -208 CH 3 n Symbols n Truth Table A 0 0 1 1 B 0 1 n Out 1 0 0 0 n Timing Diagram Logic Expression: Out = A+B 7
3. 6 XOR Gate 241 -208 CH 3 n Symbols n Truth Table A 0 0 1 1 B 0 1 n Out 0 1 1 0 n Timing Diagram Logic Expression: Out = A B+AB; A B 8
XNOR Gate 241 -208 CH 3 n Symbols n Truth Table A 0 0 1 1 B 0 1 n Out 1 0 0 1 n Timing Diagram Logic Expression: Out = A B+AB; A B 9
3. 7 Integrated Circuit Logic Gates n n CMOS: Complementary Metal. Oxide Semiconductor Low Power Dissipation DC Power Supply: 5 V & 3. 3 V CMOS Series: 74(or 54) + letter(s) + numbers Letters: HC, HCT = High-speed CMOS LV, LVC = Low-voltage CMOS BCT = Bi. CMOS (combine CMOS&TTL) Numbers: 00= Quad 2 -input NAND 02= Quad 2 -input NOR 04= Hex inverter 241 -208 CH 3 n n n TTL: Transistor-Transistor Logic Not Sensitive to Electrostatic Discharge Switching Speed DC Power Supply: 5 V TTL Series: 74 (or 54) + letter(s) + numbers Letters: S = Schottky TTL LS = Low-power Schottky TTL F = Fast TTL Numbers: 08= Quad 2 -input AND 10= Triple 3 -input NAND 32= Quad 2 -input OR 10
3. 7 IC Logic Gate (cont. ) n n Packages DIP, SMD n PBGA IC Gate Config. DIP TSSOP LQFP TQFP 241 -208 CH 3 11
Performance Characteristics & Parameters n Propagation Delay Time: t. P , t. PHL , t. PLH 241 -208 CH 3 12
Performance Characteristics & Parameters (cont. ) n DC Power Supply: 3. 3 (CMOS), 5 V (CMOS or TTL) Retrieved from Motorola SN 74 LS 00 241 -208 CH 3 13
Performance Characteristics & Parameters (cont. ) Fan-out and Loading n indicates the number of loads that can be connected if a logic IC drives several loads with the same characteristics. For TTL device: Unit loads (HIGH Logic) = IOH/IIH Unit loads (LOW logic) = IOL/IIL 241 -208 CH 3 14
Performance Characteristics & Parameters (cont. ) n Power Dissipation (PD) PD = VCC (ICCH+ICCL)/2 241 -208 CH 3 15
Performance Characteristics & Parameters (cont. ) I/O Logic Levels 241 -208 CH 3 TTL: VIL =0. 8 V, VIH =2 V VOL =0. 4 V, VOH =2. 4 V 16
Performance Characteristics & Parameters (cont. ) n Speed-power Product (SPP) SPP = t. P*PD (Joul unit) Homework Lists (pp. 153 -158) 1, 3, 5, 9, 11, 13, 15, 20, 25, 27, 28, 39, 40, 43 Assignments: - 241 -208 CH 3 17
- Slides: 17