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参数资料
| 型号： | SN74LS257BMR1 |
| 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, SOP-16 |
| 文件页数： | 4/8页 |
| 文件大小： | 223K |
| 代理商： | SN74LS257BMR1 |
SN74LS257B, SN74LS258B
http://onsemi.com
4
FUNCTIONAL DESCRIPTION
The LS257B and LS258B are Quad 2-Input Multiplexers
with 3-state outputs. They select four bits of data from two
sources each under control of a Common Data Select Input.
When the Select Input is LOW, the I0 inputs are selected and
when Select is HIGH, the I1 inputs are selected. The data on
the selected inputs appears at the outputs in true
(non-inverted) form for the LS257B and in the inverted form
for the LS258B.
The LS257B and LS258B are 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:
When the Output Enable Input (E0) is HIGH, the outputs
are forced to a high impedance “off” state. If the outputs are
tied together, all but one device must be in the high
impedance state to avoid high currents that would exceed the
maximum ratings. Designers should ensure that Output
Enable signals to 3-state devices whose outputs are tied
together are designed so there is no overlap.
LS257B
Za = E0 (I1a S + I0a S) Zb = E0 (I1b S + I0b S)
Zc = E0 (I1c S + I0c S) Zd = E0 (I1d S + I0d S)
LS258B
Za = E0 (I1a S + I0a S) Zb = E0 (I1b S + I0b S)
Zc = E0 (I1c S + I0c S) Zd = E0 (I1d S + I0d S)
TRUTH TABLE
OUTPUT
ENABLE
SELECT
INPUT
DATA
INPUTS
OUTPUTS
LS257B
OUTPUTS
LS258B
EO
S
I0
I1
Z
H
X
(Z)
L
H
X
LL
H
L
H
X
HH
L
XL
H
L
H
X
H
L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
(Z) = High Impedance (off)
相关PDF资料 |
PDF描述 |
|---|---|
| SN74LS258BDR2 | LS SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, INVERTED OUTPUT, PDSO16 |
| SN74LS258ANG | LS SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, INVERTED OUTPUT, PDIP16 |
| SN54LS257AJD | LS SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, CDIP16 |
| SN54LS257AJ | LS SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, CDIP16 |
| SN74LS259JD | LS SERIES, LOW LEVEL TRIGGERED D LATCH, TRUE OUTPUT, CDIP16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SN74LS257BN | 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 |
| SN74LS257BN | 制造商:Texas Instruments 功能描述:MULTIPLEXER IC |
| SN74LS257BN3 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| SN74LS257BNE4 | 功能描述:编码器、解码器、复用器和解复用器 Quad 2-to-1 Data Slct/Mltpx W/3St Otp 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 |
| SN74LS257BNS | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
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