HD74LS93 Datasheet, PDF (2/9 Pages) Hitachi Semiconductor – 4-bit Binary Counters

HD74LS93
Function Table
• Reset / Count Function Table
Reset inputs
R₀₍₁₎
R₀₍₂₎
Q_D
H
H
L
L
X
X
L
Note: H; high level, L; low level, X; irrelevant
• BCD Count Sequence (Notes 1)
Count
Q_D
Q_C
0
L
L
1
L
L
2
L
L
3
L
L
4
L
H
5
L
H
6
L
H
7
L
H
8
H
L
9
H
L
10
H
L
11
H
L
12
H
H
13
H
H
14
H
H
15
H
H
Notes: 1. Output QA is connected to input B for BCD count.
2. H; high level, L; low level
Outputs
Q_C
Q_B
L
L
Count
Count
Outputs
Q_B
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
Q_A
L
Q_A
L
H
L
H
H
H
L
H
L
H
L
H
L
H
L
H
Rev.2.00, Feb.18.2005, page 2 of 8