参数资料
型号: 74AC139SCX
厂商: Fairchild Semiconductor
文件页数: 2/9页
文件大小: 0K
描述: IC DECODER/DEMUX 1-OF-4 16-SOIC
标准包装: 1
系列: 74AC
类型: 解码器/多路分解器
电路: 1 x 2:4
独立电路: 2
输出电流高,低: 24mA,24mA
电压电源: 单电源
电源电压: 2 V ~ 6 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 16-SOIC(0.154",3.90mm 宽)
供应商设备封装: 16-SOIC
包装: 标准包装
产品目录页面: 1205 (CN2011-ZH PDF)
其它名称: 74AC139SCXDKR
www.fairchildsemi.com
2
74AC139
74ACT139
Logic Symbols
IEEE/IEC
Truth Table
H
= HIGH Voltage Level
L
= LOW Voltage Level
X
= Immaterial
Functional Description
The AC/ACT139 is a high-speed dual 1-of-4 decoder/
demultiplexer. The device has two independent decoders,
each of which accepts two binary weighted inputs (A0–A1)
and provides four mutually exclusive active-LOW outputs
(O0–O3). Each decoder has an active-LOW enable (E).
When E is HIGH all outputs are forced HIGH. The enable
can be used as the data input for a 4-output demultiplexer
application. Each half of the AC/ACT139 generates all four
minterms of two variables. These four minterms are useful
in some applications, replacing multiple gate functions as
shown in Figure 1, and thereby reducing the number of
packages required in a logic network.
FIGURE 1. Gate Functions (Each Half)
Logic Diagram
Please note that this diagram is provided only for the understanding of logic
operations and should not be used to estimate propagation delays.
Inputs
Outputs
E
A0
A1
O0
O1
O2
O3
H
X
HHHH
L
LLL
H
L
H
LH
H
L
HHH
L
H
L
HHHHH
L
相关PDF资料
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