CT362 – Modern Digital Design and Lab Grantham University Week 1 – Assignment 5-2. A TTL output of 2.0V is considered HIGH output. 5-4. Applying 3.0V to a 74HC00 series CMOS input (5V power supply) is interpreted by the IC as an Undefined logic level. 5-5. A “typical” HIGH output voltage for a TTL gate would be about 3.5V. 5-6. A “typical” LOW output voltage for a TTL gate would be about 0.1V. 5-8. A “typical” LOW output voltage for a CMOS gate (10V power supply) would be about 0V. 5-14. The CMOS logic family has better noise immunity. 5-16. Refer to Fig 5-4. The noise margin for the TTL family is about 0.4V. 5-18. The fan-out for standard TTL is said to be 10 when driving standard TTL gates. 5-20. Refer to Fig. 5-6(b). A single 74HC00 series CMOS output has the capacity to drive at least 10 LSTTL inputs. 5-25. Refer to Fig. 5-8(b). The AS-TTL logic family has the lowest propagation delays and is considered the fastest. 5-27. Generally, CMOS ICs consume the least power. 5-33. Refer to Fig. 5-48. Closing SW1 causes the input to the inverter to go HIGH and the LED lights. 5-35. The common switch debouncing circuits in Fig.5-14(b) and (c) are called RS flip-flop or latch. 5-42. Refer to Fig. 5.25(b). The transistor function as Driver in this circuit. 5-45. Refer to Fig. 5-27(b). When the input to the inverter goes HIGH, its output goes LOW which turns off the NPN transistor; the coil of the relay is deactivated, the armature of the relay will not click downward, and the solenoid will not be activated. 5-48. Refer to Fig. 5-28(c). The piezo buzzer sounds when the input to the invertor goes HIGH. 5-49. Refer to Fig. 5-28(d). This is an example of good design practice by using an opto-isolator to isolate the low-voltage digital circuit from the higher-voltage noisy motor circuit. True. 5-50. Refer to Fig. 5-28(d). The dc motor turns on when a LOW logic level appears at the input of the inverter. 5-53. Refer to Fig. 5-49. The pulse generator will vary the pulse width from about 1 to 2 ms causing the servo motor to adjust the angular position of the output shaft.