North Park Secondary School

Computer Engineering 11 (ICE 3M0)

Experiment 17

Digital Lab 17

R-S Flip Flop


Teacher's Name

Student's Name

Student No.

PURPOSE:

To investigate the difference output states of an R-S flip flop circuit.

Materials

One SK-50 breadboarding socket
One 7400 TTL integrated circuit(NAND)
Two 470 OHM resistors
Two LED's
Seven Wires
One 9V Battery


Curcuit



PROCEDURE:

  1. Assemble the circuit on the breadboard.
  2. Observe LED1 and LED2 for steps 3 to 9. Be sure to record your observations after each step.
  3. Connect inputs A to high and B to low.
  4. Leave input A to high and change B to high.
  5. Connect inputs A to low and B to high.
  6. Connect inputs A to high and leave B to high.
  7. Connect inputs A and B to low.
  8. Change inputs A and B from low to high at the same time.
  9. Repeat (#8) several times.

OBSERVATIONS

Procedure
Input
A
S-Set
Input
B
R-Reset
Output
LED1
Q
Output
  LED2
Q
3
1
0
4
1
0 --> 1
5
0
1
6
0 --> 1
1
7
0
0
8
0 --> 1
0 --> 1


DISCUSSION

                                                                     _
  1. What is the relationship of a Q and Q in procedures (3) and (5)?
  2. What does the bar over the Q mean?
  3. Explain how the outputs Q and Q inverted are obtained from the inputs R and S in procedure 3.
  4. Explain why outputs Q and Q inverted do not change from procedure 3 to 4.
  5. Repeat questions 3 and 4 for procedures 5 and 6.
  6. Explain the outputs Q and Q inverted in procedure 7.
  7. Explain the inconsistent results in procedure 8.
  8. Why is this circuit called a flip flop?

CONCLUSION

Summarize in table form the operation of an R-S flip flop


Page Lasted Updated 10:21 AM 10/14/2003

 

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