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参数资料
| 型号： | SN74LS157MEL |
| 厂商： | ON SEMICONDUCTOR |
| 元件分类： | 编、解码器及复用、解复用 |
| 英文描述： | LS SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDSO16 |
| 封装： | EIAJ, SO-16 |
| 文件页数： | 3/7页 |
| 文件大小： | 173K |
| 代理商： | SN74LS157MEL |
SN74LS157
http://onsemi.com
3
Figure 3. Logic Diagram
14
1
26
7
3
4
5
9
11
12
10
13
15
VCC = 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:
Za = E (I1a S + I0a S)
Zb = E (I1b S + I0b S)
Zc = E (I1c S + I0c S)Zd = E (I1d S + I0d 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
I0
I1
Z
H
X
L
H
X
LL
L
H
X
HH
L
XL
L
H
X
H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
相关PDF资料 |
PDF描述 |
|---|---|
| SN74LS157ND | LS SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDIP16 |
| SN74LS15JDS | LS SERIES, TRIPLE 3-INPUT AND GATE, CDIP14 |
| SN74LS160ADR2 | LS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP DECADE COUNTER, PDSO16 |
| SN74LS161AD | LS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP BINARY COUNTER, PDSO16 |
| SN74LS162AD | LS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP DECADE COUNTER, PDSO16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SN74LS157ML1 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| SN74LS157MR1 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| SN74LS157N | 功能描述:编码器、解码器、复用器和解复用器 Quad Data RoHS:否 制造商:Micrel 产品:Multiplexers 逻辑系列:CMOS 位数: 线路数量（输入/输出）:2 / 12 传播延迟时间:350 ps, 400 ps 电源电压-最大:2.625 V, 3.6 V 电源电压-最小:2.375 V, 3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Tray |
| SN74LS157N | 制造商:Texas Instruments 功能描述:IC 74LS 74LS157 DIP16 |
| SN74LS157NE4 | 功能描述:编码器、解码器、复用器和解复用器 Quad 2-1-Line Data Selectors/Mltplxrs RoHS:否 制造商:Micrel 产品:Multiplexers 逻辑系列:CMOS 位数: 线路数量（输入/输出）:2 / 12 传播延迟时间:350 ps, 400 ps 电源电压-最大:2.625 V, 3.6 V 电源电压-最小:2.375 V, 3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Tray |
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