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Chapter 11. CMOS and TTL Circuits By Taweesak Reungpeerakul. Contents. Basic Operational Characteristics and Parameters CMOS Circuits TTL Circuits. 11.1 Basic Operational Characteristics and Parameters. DC Supply Voltage CMOS: +5 or +3.3 Volts TTL : +5 Volts CMOS Logic Levels
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Chapter 11 CMOS and TTL Circuits By Taweesak Reungpeerakul 241-208 CH11
Contents • Basic Operational Characteristics and Parameters • CMOS Circuits • TTL Circuits 241-208 CH11
11.1 Basic Operational Characteristics and Parameters • DC Supply Voltage • CMOS: +5 or +3.3 Volts • TTL : +5 Volts • CMOS Logic Levels • +5 V Supply VIH : 3.5-5 V VOH : 4.4-5 V VIL: 0-1.5 V VOL: 0-0.33 V • +3.3 V Supply VIH : 2-3.3 V VOH : 2.4-3.3 V VIL: 0-0.8 V VOL: 0-0.4 V • TTL Logic Levels (+5 V Supply) VIH : 2-5 V VOH : 2.4-5 V VIL: 0-0.8 V VOL: 0-0.4 V 241-208 CH11
11.1 Basic Operational Characteristics and Parameters (cont.) • Noise Immunity • Noise Margin • Power Dissipation • Propagation Delay (tPHL & tPLH) • Speed-Power Product • Loading and Fan-out 241-208 CH11
Noise Immunity 241-208 CH11
Noise Margin • VNH =VOH(min)– VIH(min) • VNL =VIL(max)– VOL(max) • Find VNH &VNL for 5 V CMOS • VNH =VOH(min)– VIH(min) =4.4– 3.5 =0.9 V • VNL =VIL(max)– VOL(max) =1.5– 0.33 =1.17 V Question: Find VNH &VNL for 5 V TTL 241-208 CH11
ICC = ICCH+ICCL 2 PD = VCC*ICC Example: find PD 2 µA when HI 3.6 µA when LO 50% Duty cycle Power VS Frequency Power Dissipation • ICC= 2.8 µA • PD = (5V)(2.8µA) = 14 µW 241-208 CH11
Loading and Fan-out • Fan-out 241-208 CH11
CMOS Loading 241-208 CH11
TTL Loading 241-208 CH11
11.2 CMOS Circuits • MOSFET n-channel p-channel 241-208 CH11
CMOS Inverter 241-208 CH11
CMOS NAND Gate 241-208 CH11
CMOS NOR Gate 241-208 CH11
Open-drain Gate 241-208 CH11
Tristate CMOS Gate 241-208 CH11
11.3 TTL Circuits • The Bipolar Junction Transistor(BJT) • TTL Inverter • TTL NAND Gate • Open-collector Gates • TristateTTL Gates 241-208 CH11
The Bipolar Junction Transistor(BJT) 241-208 CH11
TTL Inverter 241-208 CH11
TTL NAND Gate 241-208 CH11
Open-collector Gates 241-208 CH11
Tristate TTL Gate 241-208 CH11