Datasheet

2
Functional Diagram
TRUTH TABLE
ENABLE
SELECT
INPUT DATA INPUTS
OUTPUT
157 158
E S I0 I1 Y Y
HXXXLH
LLLXLH
LLHXHL
LHXLLH
LHXHHL
H = High Voltage Level, L = Low Voltage Level, X = Don’t Care
2
3
5
6
10
13
14
11
4
7
12
9
4Y
3Y
2Y
1Y
1Y
4Y
3Y
2Y
HC/HCT
157
HC/HCT
158
1I
0
1I
1
2I
0
2I
1
3I
0
3I
1
4I
0
4I
1
S
E
115
CD54/74HC157, CD54/74HCT157, CD54/74HC158, CD54/74HCT158