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PULSE
GENERATOR
MC14518B
MC14520B
MOTOROLA CMOS LOGIC DATA
V DD
Q0
C
Q1
Q2
E
Q3
R
C L
C L
V SS
Figure 2. Switching Time Test Circuit and Waveforms
1
2
3
4
5
CLOCK
ENABLE
RESET
1
2
3
4
5
Q0
Q1
Q2
Q3
1
2
3
4
5
Q0
Q1
Q2
Q3
Figure 3. Timing Diagram
20 ns
CLOCK
INPUT
C L
C L
Q
t r
6
7
8
9
10
11
12
13
14
15
16
6
7
8
9
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
20 ns
V DD
90%
50%
10%
V SS
t WH
t WL
t PLH
t PHL
90%
50%
10%
t f
17
18
6
7
8
9
0
0
1
2
3
4
MC14518B MC14520B
6–295
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