74F157ASJ Fairchild Semiconductor, 74F157ASJ Datasheet - Page 2
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74F157ASJ
Manufacturer Part Number
74F157ASJ
Description
MULTIPLEXER QUAD 2INPUT 16SOP
Manufacturer
Fairchild Semiconductor
Series
74Fr
Type
Multiplexerr
Specifications of 74F157ASJ
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 (5.3mm Width), 16-SO, 16-SOEIIJ
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
74F157ASJ
Manufacturer:
LT
Quantity:
3 000
Company:
Part Number:
74F157ASJX
Manufacturer:
POWER-ONE
Quantity:
29
www.fairchildsemi.com
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
L
X
X
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
Output I
20 A/ 0.6 mA
20 A/ 0.6 mA
20 A/ 0.6 mA
20 A/ 0.6 mA
E • (I
Input I
1 mA/20 mA
1n
S
IH
OH
/I
/I
IL
I
OL
0n
S)