Datasheet

2
Functional Diagram
TRUTH TABLE
CP E MR OUTPUT STATE
↑ H L Increment Counter
L ↓ L Increment Counter
↓ X L No Change
X ↑ L No Change
↑ L L No Change
H ↓ L No Change
XXHQ
0
thru Q
3
= L
H = High State.
L = Low State.
↑ = High-to-Low Transition.
↓ = Low-to-High Transition.
X = Don’t Care.
1CP
1Q
2
5
6
1Q
3
1Q
1
4
1Q
0
3
1
1E
2
CL
R
1MR
7
÷10/÷16
2CP
2Q
2
13
14
2Q
3
2Q
1
12
2Q
0
11
9
2E
10
CL
R
2MR
15
÷10/÷16
GND = 8
V
CC
= 16
CD74HC4518, CD54HC4520, CD74HC4520, CD74HCT4520