HD74AC153
Dual 4-Input Multiplexer
Description
The HD74AC153 is a high-speed dual 4-input multiplexer with common select inputs and individual
enable inputs for each section. It can select two lines of data from four sources. The two buffered outputs
present data in the true (noninverted) form. In addition to multiplexer operation, the HD74AC153 can act
as a function generator and generate any two functions of three variables.
Feature
•
Outputs Source/Sink 24 mA
Pin Arrangement
E
a
1
S
1
2
I
3a
3
I
2a
4
I
1a
5
I
0a
6
Z
a
7
GND 8
(Top view)
16 V
CC
15
E
b
14 S
0
13 I
3b
12 I
2b
11 I
1b
10 I
0b
9 Z
b
HD74AC153
Logic Symbol
E
a
I
0a
I
1a
I
2a
I
3a
I
0b
I
1b
I
2b
I
3b
E
b
S
0
S
1
Z
a
Z
b
Pin Names
I
0a
to I
3a
Side A Data Inputs
I
0b
to I
3b
Side B Data Inputs
S
0
, S
1
E
a
E
b
Z
a
Z
b
Common Select Inputs
Side A Enable Input
Side B Enable Input
Side A Output
Side B Output
Functional Description
The HD74AC153 is a dual 4-input multiplexer. It can select two bits of data from up to four sources under
the control of the common Select inputs (S
0
, S
1
). The two 4-input multiplexer circuits have individual
active-Low Enables (E
a
,
E
b
) which can be used to strobe the outputs independently. When the Enables (E
a
,
E
b
) are High, the corresponding outputs (Z
a
, Z
b
) are forced Low. The HD74AC153 is the logic
implementation of a 2-pole, 4-position switch, where the position of the switch is determined by the logic
levels supplied to the two Select inputs. The logic equations for the outputs are shown below.
Z
a
=
E
a
•(I
0a
•S
1
•S
0
+ I
1a
•S
1
•S
0
+ I
2a
•S
1
•S
0
+ I
3a
•S
1
•S
0
)
Z
b
=
E
b
•(I
0b
•S
1
•S
0
+ I
1b
•S
1
•S
0
+ I
2b
•S
1
•S
0
+ I
3b
•S
1
•S
0
)
2
HD74AC153
Truth Table
Select Inputs
S
0
X
L
L
H
H
L
L
H
H
H :
L :
X :
S
1
X
L
L
L
L
H
H
H
H
Input (a or b)
E
H
L
L
L
L
L
L
L
L
I
0
X
L
H
X
X
X
X
X
X
I
1
X
X
X
L
H
X
X
X
X
I
2
X
X
X
X
X
L
H
X
X
I
3
X
X
X
X
X
X
X
L
H
Output
Z
L
L
H
L
H
L
H
L
H
High Voltage Level
Low Voltage Level
Immaterial
3
HD74AC153
Logic Diagram
E
a
I
0a
I
1a
I
2a
I
3a
S
1
S
0
I
0b
I
1b
I
2b
I
3b
E
b
Z
a
Z
b
Please note that this diagram is provided only for the understanding of logic operations and should not be
used to estimate propagation delays.
DC Characteristics
(unless otherwise specified)
Item
Maximum quiescent supply current
Maximum quiescent supply current
Symbol
I
CC
I
CC
Max
80
8.0
Unit
µA
µA
Condition
V
IN
= V
CC
or ground, V
CC
= 5.5 V,
Ta = Worst case
V
IN
= V
CC
or ground, V
CC
= 5.5 V,
Ta = 25°C
4
HD74AC153
AC Characteristics: HD74AC153
Ta = +25°C
C
L
= 50 pF
Item
Propagation delay
S
n
to Z
n
Propagation delay
S
n
to Z
n
Propagation delay
E
n
to Z
n
Propagation delay
E
n
to Z
n
Propagation delay
I
n
to Z
n
Propagation delay
I
n
to Z
n
Note:
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
Symbol
t
PLH
V
CC
(V)*
1
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
1. Voltage Range 3.3 is 3.3 V
±
0.3 V
Voltage Range 5.0 is 5.0 V
±
0.5 V
Min
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
Typ
9.5
6.5
8.5
6.5
8.0
5.5
7.0
5.0
7.5
5.5
7.0
5.0
Max
15.0
11.0
14.5
11.0
13.5
9.5
11.0
8.0
12.5
9.0
11.5
8.5
Ta = –40°C to +85°C
C
L
= 50 pF
Min
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
Max
17.5
12.5
16.5
12.0
16.0
11.0
12.5
9.0
14.5
10.5
13.0
10.0
ns
ns
ns
ns
ns
Unit
ns
Capacitance
Item
Input capacitance
Power dissipation capacitance
Symbol
C
IN
C
PD
Typ
4.5
65.0
Unit
pF
pF
Condition
V
CC
= 5.5 V
V
CC
= 5.0 V
5
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