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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 0V 0 0 8V low 2 4 5 0V high MOS Vdd 3 15V 0 Vdd 3 low 2Vdd 3 Vdd high ECL Vee 5 2V 0 0 4V low 0 7 1 1V high Input Equivalent Circuit TTL Vcc Vin 4 0 k Input Equivalent Circuit CMOS Vin 12 10 1 0 pF Stepper Motor 1 2 1 Stepper Motor 1 0 2 1 Stepper Motor Timing Diagram Stepper Motor State Diagram Stepper Motor Logic Circuit DIRECTION D FREQUENCY Q IC1 A X CK Q X D Q IC1 B CK Q Y Y
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