參數(shù)資料
型號: 74F153
廠商: National Semiconductor Corporation
英文描述: Dual 4-Input Multiplexer(雙通道4輸入多路復用器)
中文描述: 雙路4輸入多路復用器(雙通道4輸入多路復用器)
文件頁數(shù): 2/10頁
文件大?。?/td> 167K
代理商: 74F153
Unit Loading/Fan Out
54F/74F
Pin Names
Description
U.L.
Input I
IH
/I
IL
Output I
OH
/I
OL
HIGH/LOW
I
0a
–I
3a
I
0b
–I
3b
S
0
, S
1
E
a
E
b
Z
a
Z
b
Side A Data Inputs
Side B Data Inputs
Common Select Inputs
Side A Enable Input (Active LOW)
Side B Enable Input (Active LOW)
Side A Output
Side B Output
1.0/1.0
1.0/1.0
1.0/1.0
1.0/1.0
1.0/1.0
50/33.3
50/33.3
20
m
A/
b
0.6 mA
20
m
A/
b
0.6 mA
20
m
A/
b
0.6 mA
20
m
A/
b
0.6 mA
20
m
A/
b
0.6 mA
b
1 mA/20 mA
b
1 mA/20 mA
Functional Description
The ’F153 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 ’F153 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 as
follows:
Z
a
e
E
a
#
(I
0a
#
S
1
#
S
0
a
I
1a
#
S
1
#
S
0
a
I
2a
#
S
1
#
S
0
a
I
3a
#
S
1
#
S
0
)
Z
b
e
E
b
#
(I
0b
#
S
1
#
S
0
a
I
1b
#
S
1
#
S
0
a
I
2b
#
S
1
#
S
0
a
I
3b
#
S
1
#
S
0
)
The ’F153 can be used to move data from a group of regis-
ters 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 as a function
generator. The ’F153 can generate two functions of three
variables. This is useful for implementing highly irregular
random logic.
Truth Table
Select
Inputs
Inputs (a or b)
Output
S
0
S
1
E
I
0
I
1
I
2
I
3
Z
X
L
L
H
H
L
L
H
H
X
L
L
L
L
H
H
H
H
H
L
L
L
L
L
L
L
L
X
L
H
X
X
X
X
X
X
X
X
X
L
H
X
X
X
X
X
X
X
X
X
L
H
X
X
X
X
X
X
X
X
X
L
H
L
L
H
L
H
L
H
L
H
H
e
HIGH Voltage Level
L
e
LOW
X
e
Immaterial
2
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