Logic Families• Transistor-Transistor Logic (TTL)• Metal-Oxide-Silicon (MOS)– N-type MOS– P-type MOS– Complementary MOS (CMOS)• Emitter-Coupled Logic (ECL)Logic Levels• TTL: Vcc=5.0V0 → 0.8V low, 2.4 → 5.0V high• MOS: Vdd=3→ 15V0 → Vdd/3low,2Vdd/3 → Vddhigh• ECL:Vee= −5.2V0 →−0.4V low,−0.7 →−1.1V highInput Equivalent Circuit: TTL4.0 kΩVccVinInput Equivalent Circuit: CMOS1012Ω 1.0 pFVinStepper Motor: φ1= φ2=1Stepper Motor: φ1=0,φ2=1Stepper Motor Timing DiagramStepper Motor State DiagramStepper Motor Logic
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