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參數(shù)資料
| 型號： | SN74LS157 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | LOW POWER SCHOTTKY |
| 中文描述： | 低功耗肖特基 |
| 文件頁數(shù)： | 3/8頁 |
| 文件大?。?/td> | 104K |
| 代理商： | SN74LS157 |
SN74LS157
http://onsemi.com
3
LOGIC DIAGRAM
I
0a
I
1a
I
0b
I
1b
I
0c
I
1c
I
0d
I
1d
E S
Z
a
Z
b
Z
c
Z
d
14
1
2
6
7
3
4
5
9
11
12
10
13
15
V
CC
= PIN 16
GND = PIN 8
= PIN NUMBERS
FUNCTIONAL DESCRIPTION
The LS157 is a Quad 2-Input Multiplexer fabricated with
the Schottky barrier diode process for high speed. 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 LS157 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:
Z
a
= E
(I
1a
S + I
0a
S)
Z
c
= E
(I
1c
S + I
0c
S)
Z
b
= E
(I
1b
S + I
0b
S)
Z
d
= E
(I
1d
S + I
0d
S)
A common use of the LS157 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 LS157 can generate any four of the
16 different functions of two variables with one variable
common. This is useful for implementing highly irregular
logic.
TRUTH TABLE
ENABLE
SELECT
INPUT
INPUTS
OUTPUT
E
S
I
0
I
1
Z
H
L
L
L
L
X
H
H
L
L
X
X
X
L
H
X
L
H
X
X
L
L
H
L
H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
相關PDF資料 |
PDF描述 |
|---|---|
| SN74LS157D | LOW POWER SCHOTTKY |
| SN74LS157N | LOW POWER SCHOTTKY |
| SN74LS157 | QUAD 2-INPUT MULTIPLEXER |
| SN74LS157D | QUAD 2-INPUT MULTIPLEXER |
| SN74LS157N | QUAD 2-INPUT MULTIPLEXER |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SN74LS157D | 功能描述:編碼器、解碼器、復用器和解復用器 Quad 2-1-Line Data Selectors/Mltplxrs RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| SN74LS157DE4 | 功能描述:編碼器、解碼器、復用器和解復用器 Quad 2-1-Line Data Selectors/Mltplxrs RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| SN74LS157DG4 | 功能描述:編碼器、解碼器、復用器和解復用器 Quad 2-1-Line Data Selectors/Mltplxrs RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| SN74LS157DR | 功能描述:編碼器、解碼器、復用器和解復用器 Quad 2-1-Line Data Selectors/Mltplxrs RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| SN74LS157DRE4 | 功能描述:編碼器、解碼器、復用器和解復用器 Quad 2-1-Line Data Selectors/Mltplxrs RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
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