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参数资料
| 型号： | MC74ACT257N |
| 厂商： | ON SEMICONDUCTOR |
| 元件分类： | 编、解码器及复用、解复用 |
| 英文描述： | ACT SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDIP16 |
| 封装： | PLASTIC, DIP-16 |
| 文件页数： | 5/12页 |
| 文件大小： | 181K |
| 代理商： | MC74ACT257N |
MC74AC257, MC74ACT257
http://onsemi.com
2
PIN NAME
PIN
FUNCTION
S
Common Data Select Input
OE
3State Output Enable Input
I0aI0d
Data Inputs from Source 0
I1aI1d
Data Inputs from Source 1
ZaZd
3State Multiplexer Outputs
TRUTH TABLE
Output
Enable
Select
Input
Data
Inputs
Outputs
OE
S
I0
I1
Z
H
X
Z
L
H
X
LL
L
H
X
HH
L
XL
L
H
X
H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
Figure 2. Logic Symbol
S
OE I0a I1a I0b I1b
Zb
I0c I1c I0d I1d
Za
Zc
Zd
FUNCTIONAL DESCRIPTION
The MC74AC257/74ACT257 is a quad 2input
multiplexer with 3state outputs. It selects four bits of data
from two sources under control of a Common Data Select
input. When the Select input is LOW, the I0x inputs are
selected and when Select is HIGH, the I1x inputs are
selected. The data on the selected inputs appears at the
outputs in true (noninverted) form. The device is the logic
implementation of a 4pole, 2position 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:
Za = OE(I1aS+I0aS)
Zb = OE(I1bS+I0bS)
Zc = OE(I1cS+I0cS)
Zd = OE(I1dS+I0dS)
When the Output Enable input (OE) is HIGH, the outputs
are forced to a high impedance 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 the Output Enable signals
to 3state devices whose outputs are tied together are
designed so there is no overlap.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC74ACT257NG | 功能描述:编码器、解码器、复用器和解复用器 5V Dual 4-Input w/3-State Out 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 |
| MC74ACT258D | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MC74ACT258N | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS |
| MC74ACT259 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:8-BIT ADDRESSABLE LATCH |
| MC74ACT259D | 功能描述:闭锁 5V 8-Bit Addressable RoHS:否 制造商:Micrel 电路数量:1 逻辑类型:CMOS 逻辑系列:TTL 极性:Non-Inverting 输出线路数量:9 高电平输出电流: 低电平输出电流: 传播延迟时间: 电源电压-最大:12 V 电源电压-最小:5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-16 封装:Reel |
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