#1
#2
#3
Seq logic #1
a) To help with the class discussion (and make sure everyone is seeing the same thing), toggle the input T several times until T is low and NOT_Que is low. (Toggle means to change the state of the switch. One “toggle” of the switch would change the state of the switch from low to high. Another toggle of the switch would change the state of the switch from high to low.)
b) Starting with the switch on GROUND, what happens to output Que when the switch is moved from GROUND to 5v? One toggle of the switch.
Output Que goes from off to on
c) What happens to output Que when the switch is moved from 5v to GROUND? One toggle of the switch.
It remains on
d) Toggle the switch one more time. What happened to output Que? What does this tell you about when Que changes (toggles) in relation to when the input at the CLK Changes. (Helpful hint: It might help to cycle though a number of changes to spot this relationship of when Que changes.)
Que changes every time CLK changes which is when the switch is changed to VCC
a) What is the relationship of D Data in to Que always?
Data In is always opposite Que
b) What is the relationship of Que to NOT_Que always?
NOT_Que is always opposite Que
c) The 74LS74N is called a “flip-flop” Based on your observations can you explain the relationship between the D Data in, Que, NOT_Q, and the CLK signal? What does a flip-flop do?
The CLK turns on when the values of Que, NOT_Q and CLK “flip-flop”, which means that Data in and NOT_Q turn on/ off together and Que does the opposite.
b) Starting with the switch on GROUND, what happens to output Que when the switch is moved from GROUND to 5v? One toggle of the switch.
Output Que goes from off to on
c) What happens to output Que when the switch is moved from 5v to GROUND? One toggle of the switch.
It remains on
d) Toggle the switch one more time. What happened to output Que? What does this tell you about when Que changes (toggles) in relation to when the input at the CLK Changes. (Helpful hint: It might help to cycle though a number of changes to spot this relationship of when Que changes.)
Que changes every time CLK changes which is when the switch is changed to VCC
a) What is the relationship of D Data in to Que always?
Data In is always opposite Que
b) What is the relationship of Que to NOT_Que always?
NOT_Que is always opposite Que
c) The 74LS74N is called a “flip-flop” Based on your observations can you explain the relationship between the D Data in, Que, NOT_Q, and the CLK signal? What does a flip-flop do?
The CLK turns on when the values of Que, NOT_Q and CLK “flip-flop”, which means that Data in and NOT_Q turn on/ off together and Que does the opposite.