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參數(shù)資料
| 型號(hào)： | SN74LS157N |
| 廠商： | MOTOROLA INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | QUAD 2-INPUT MULTIPLEXER |
| 中文描述： | LS SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁(yè)數(shù)： | 3/8頁(yè) |
| 文件大?。?/td> | 104K |
| 代理商： | SN74LS157N |
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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SN74LS157N | 制造商:Texas Instruments 功能描述:IC 74LS 74LS157 DIP16 |
| SN74LS157NE4 | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 Quad 2-1-Line Data Selectors/Mltplxrs RoHS:否 制造商:Micrel 產(chǎn)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(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| SN74LS157NS | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| SN74LS157NSR | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 Quad 2-1-Line Data Selectors/Mltplxrs RoHS:否 制造商:Micrel 產(chǎn)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(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| SN74LS157NSRE4 | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 Quad 2-1-Line Data Selectors/Mltplxrs RoHS:否 制造商:Micrel 產(chǎn)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(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
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