Philips Semiconductors
Product speci鏗乧ation
Dual 4-bit binary ripple counter
74HC/HCT393
Fig.4 Functional diagram.
Fig.5 State diagram.
COUNT SEQUENCE FOR 1 COUNTER
OUTPUTS
COUNT
Q
0
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Notes
Fig.6 Logic diagram (one counter).
1. H = HIGH voltage level
L = LOW voltage level
4
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
Q
1
L
L
L
L
H
H
H
H
L
L
L
L
H
H
H
H
Q
2
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
Q
3
December 1990