Chapter Resources: Chapter Assignments
Chapter 5 - IC Specifications and Simple Interfacing

1. List some types of information available to engineers and technicians on a typical manufacturer's IC data sheet. Look at the data sheet for the 7408 or 74LS08 AND gate IC. (use data manuals from library or download data sheets from www.fairchildsemi.com)
   
2. Write a short description of how an electromagnet and a relay operate. Use diagrams if possible. (use www.howstuffworks.com)
   
3. Refer to Fig. 5-1 (below; prepared with Electronics Workbench®, Version 5). Explain how the NPN transistor operates as a switch. You may use computer circuit simulator software to set up and operate this circuit.
   
   
4. Refer to Fig. 5-2 (below; prepared with Electronics Workbench®, Version 5). Draw an input voltage profile for the 4000 CMOS IC1. Use computer simulation software. The profile will look something like that in Fig. 5-2(a), Digital Electronics, 6th.ed. page 127. Do not expect the undefined region to be wide as in the textbook because you are locating the switching threshold for this specific IC.
   
   
5. Refer to Fig. 5-1 in Digital Electronics, 6th edition textbook page 126. The following input voltages to a TTL IC (assume a +5V supply) would be interpreted as HIGH, LOW, or undefined:
   1. +4V
   2. +0.2V
   3. +1.5V
   4. +2.2V
      
6. Refer to Fig. 5-2(a) in Digital Electronics, 6th edition textbook page 127. The following input voltages to a CMOS 4000-series or CMOS-74C00 series IC (assume a +10V supply) would be interpreted as HIGH, LOW, or undefined:
   1. +0.1V
   2. +9.9V
   3. +5V
   4. +2V
   5. +8V
      
7. Refer to Fig. 5-2(b) in Digital Electronics, 6th edition textbook page 127. The following input voltages to a CMOS 74HC00-series IC (assume a +5V supply) would be interpreted as HIGH, LOW, or undefined:
   1. +4.5V
   2. +0.1V
   3. +2.2V
   4. +0.5V
   5. +3V
      
8. Refer to Fig. 5-2(c) in Digital Electronics, 6th edition textbook page 127. The following input voltages to a CMOS 74FCT00-series IC (assume a +5V supply) would be interpreted as HIGH, LOW, or undefined:
   1. +4V
   2. +2.2V
   3. +0.2V
   4. +1.5V
   5. +1V
      
9. Write a short paragraph explaining what we mean by noise margin as an IC specification? Diagrams might be useful.
   
10. What CMOS logic family seems to have excellent drive capabilities?
    
11. Refer to Fig. 5-3 (prepared with Electronics Workbench®, Version 5). When interfacing between TTL and CMOS (4000 or 74C00 series) component R1 is required. What is resistor R1 called and what is its purpose?
    
    
12. Use circuit simulation software to
    1. draw the interfacing circuit in Fig. 5-24(b) on page 148 in the textbook (TTL or FACT to buzzer with transistor driver),
    2. check its operation, and
    3. demonstrate its operation to your instructor.
       
13. Use circuit simulation software to
    1. draw the interfacing circuit in Fig. 5-26(a) on page 150 in the textbook (TTL or FACT to motor using transistor driver and a relay for isolation),
    2. check its operation, and
    3. demonstrate its operation to your instructor.
       
14. List at least three types of stepper motors. (use www.cs.uiowa.edu/~jones/step)
    
15. List at least two surplus or hobby suppliers for stepper motors. (use www.cs.uiowa.edu/~jones/step)