74LS153 ON Semiconductor, 74LS153 Datasheet - Page 3

• Manufacturer Part Number: 74LS153
• Description: LOW POWER SCHOTTKY
• Manufacturer: ON Semiconductor

FUNCTIONAL DESCRIPTION
Low Power, Schottky barrier diode process for high speed.
It can select two bits of data from up to four sources under
the control of the common Select Inputs (S
4-input multiplexer circuits have individual active LOW
Enables (E
independently. When the Enables (E
corresponding outputs (Z
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.
The LS153 is a Dual 4-input Multiplexer fabricated with
The LS153 is the logic implementation of a 2-pole,
a
, E
b
) which can be used to strobe the outputs
a
, Z
b
) are forced LOW.
1
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
E
SELECT INPUTS
a
I
S
0a
H
H
H
H
X
L
L
L
L
0
6
a
, E
5
I
1a
7
b
) are HIGH, the
Z
0
a
S
H
H
H
H
X
L
L
L
L
, S
1
4
I
2a
1
). The two
H
E
L
L
L
L
L
L
L
L
3
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LOGIC DIAGRAM
I
TRUTH TABLE
3a
SN74LS153
V
GND = PIN 8
CC
2
INPUTS (a or b)
I
H
X
L
X
X
X
X
X
X
S
= PIN NUMBERS
0
= PIN 16
1
3
14
S
I
X
X
X
H
X
X
X
X
L
1
0
registers to a common output bus. The particular register
from which the data came would be determined by the state
of the Select Inputs. A less obvious application is a function
generator. The LS153 can generate two functions of three
variables. This is useful for implementing highly irregular
random logic.
10
The LS153 can be used to move data from a group of
I
Z
Z
0b
I
X
X
X
X
X
H
X
X
L
a
b
2
= E
= E
11
I
1b
b
a
I
X
X
X
X
X
X
X
H
L
3
9
(I
(I
Z
12
0b
0a
b
I
OUTPUT
2b
S
S
1
1
H
H
H
H
Z
L
L
L
L
L
13
S
I
S
3b
I
I
3a
3b
0
0
E
+ I
+ I
b
15
S
S
1a
1b
1
1
S
S
S
S
1
0
1
0
)
)
S
S
0
0
+ I
+ I
2a
2b
S
S
1
1
S
S
0
0
+
+