74F157ASCX Fairchild Semiconductor, 74F157ASCX Datasheet - Page 2

• Manufacturer Part Number: 74F157ASCX
• Description: MULTIPLEXER QUAD 2INPUT 16SOIC
• Manufacturer: Fairchild Semiconductor
• Series: 74Fr
• Type: Multiplexerr

Specifications of 74F157ASCX

• Circuit: 4 x 2:1
• Independent Circuits: 1
• Current - Output High, Low: 1mA, 20mA
• Voltage Supply Source: Single Supply
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Dc: 0118
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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Unit Loading/Fan Out
Truth Table
H
L
X
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
LOW Voltage Level
HIGH Voltage Level
Immaterial
E
H
L
L
L
L
S
X
H
H
L
L
Inputs
I
I
E
S
Z
0a
1a
Pin Names
a
–Z
–I
–I
0d
1d
d
I
X
X
X
H
L
0
Source 0 Data Inputs
Source 1 Data Inputs
Enable Input (Active LOW)
Select Input
Outputs
I
X
H
X
X
L
1
Description
Output
H
H
Z
L
L
L
2
Functional Description
The F157A is a quad 2-input multiplexer. It selects four bits
of data from two sources under the control of a common
Select input (S). The Enable input (E) is active LOW. When
E is HIGH, all of the outputs (Z) are forced LOW regardless
of all other inputs. The F157A is the logic implementation of
a 4-pole, 2-position switch where the position of the switch
is determined by the logic levels supplied to the Select
input. The logic equations for the outputs are shown below:
A common use of the F157A is the moving of data from two
groups of registers to four common output busses. The
particular register from which the data comes is determined
by the state of the Select input. A less obvious use is as a
function generator. The F157A can generate any four of
the 16 different functions of two variables with one variable
common. This is useful for implementing highly irregular
logic.
HIGH/LOW
50/33.3
1.0/1.0
1.0/1.0
1.0/1.0
1.0/1.0
U.L.
Z
n
E • (I
1n
Output I
20 A/ 0.6 mA
20 A/ 0.6 mA
20 A/ 0.6 mA
20 A/ 0.6 mA
S
Input I
1 mA/20 mA
I
0n
S)
IH
OH
/I
/I
IL
OL