HD74LS393 Datasheet, PDF (2/7 Pages) Hitachi Semiconductor – DUAL 4-BIT BINARY COUNTERS

HD74LS393
Function Table
Count
Q_D
0
L
1
L
2
L
3
L
4
L
5
L
6
L
7
L
8
H
9
H
10
H
11
H
12
H
13
H
14
H
15
H
H; high level, L; low level
Block Diagram (1/2)
Input A
Clear
Input
Output
Q_C
Q_B
Q_A
L
L
L
L
L
H
L
H
L
L
H
H
H
L
L
H
L
H
H
H
L
H
H
H
L
L
L
L
L
H
L
H
L
L
H
H
H
L
L
H
L
H
H
H
L
H
H
H
QA
T
Clear
QB
T
Clear
QC
T
Clear
QD
T
Clear
QA
QB
Outputs
QC
QD
Rev.2.00, Feb.18.2005, page 2 of 6