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.