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參數(shù)資料
| 型號： | HD74AC157 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Quad 2-Input Multiplexer(四2輸入多路復用器) |
| 中文描述： | 四2輸入復用器（四2輸入多路復用器） |
| 文件頁數(shù)： | 2/9頁 |
| 文件大?。?/td> | 53K |
| 代理商： | HD74AC157 |
HD74AC157
2
Logic Symbol
S
E
I
0a
Z
a
Z
b
Z
c
Z
d
I
1a
I
0b
I
0c
I
1c
I
od
I
1d
I
1b
Pin Names
I
0a
to I
0d
I
1a
to I
1d
E
S
Z
a
to
Z
d
Source 0 Data Inputs
Source 1 Data Inputs
Enable Input
Select Input
Outputs
Functional Description
The HD74AC157 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 HD74AC157 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:
Z
a
=
E
(I
1a
S + I
0a
S
)
Z
b
=
E
(I
1b
S + I
0b
S
)
Z
c
=
E
(I
1c
S + I
0c
S
)
Z
d
=
E
(I
1d
S + I
0d
S
)
A common use of the HD74AC157 is the moving of data from two groups of register 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 HD74AC157 can generate any four of the sixteen
different functions of two variables with one variable common. This is useful for implementing gating
functions.
相關PDF資料 |
PDF描述 |
|---|---|
| HD74AC158 | Quad 2-Input Multiplexer(四2輸入多路復用器) |
| HD74AC164 | Serial-In, Parallel-Out Shift Register(串入并出移位寄存器) |
| HD74ACT164 | Serial-In, Parallel-Out Shift Register(串入并出移位寄存器) |
| HD74AC165 | Parallel-Load 8-bit Shift Register(并入8位移位寄存器) |
| HD74ACT165 | Parallel-Load 8-bit Shift Register(并入8位移位寄存器) |
相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD74AC157AFPEL | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Quad 2-Input Multiplexer |
| HD74AC157ARPEL | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Quad 2-Input Multiplexer |
| HD74AC157FP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2-Input Digital Multiplexer |
| HD74AC157FP(E) | 制造商:Renesas Electronics Corporation 功能描述: |
| HD74AC157P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2-Input Digital Multiplexer |
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