1
Flip-flops, counting measurements
CHM6158C - Lecture
8
•
cross-coupled gates
•
flip-flops
•
counters

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2
Previous lecture
FALSE = 0 = low voltage (0-2 V)
TRUE = 1= high voltage (3-5 V)
Logic gates:
Recall truth tables for both of
these logic symbols

3
Cross-coupled NOR gates
Cross-coupled NOR gates
What is the resulting
truth table?
R
S
Q
(neg)Q
0
0
1
0
0
0
0
1
0
1
1
0
1
0
0
1
1
1
0
0
Q = not Q
BAD

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4
Cross-coupled NAND gates
What is the resulting
truth table?
R
S
Q
(neg)Q
0
0
1
1
0
1
1
0
1
0
0
1
1
1
0
1
1
1
1
0
BAD