參數(shù)資料
型號: 74ACT139SCX
廠商: FAIRCHILD SEMICONDUCTOR CORP
元件分類: 通用總線功能
英文描述: Complete, Dual, 12-Bit Multiplying DAC with 8-Bit Bus Interface
中文描述: ACT SERIES, OTHER DECODER/DRIVER, INVERTED OUTPUT, PDSO16
封裝: 0.150 INCH, MS-012, SOIC-16
文件頁數(shù): 3/10頁
文件大?。?/td> 61K
代理商: 74ACT139SCX
HD74AC139/HD74ACT139
3
Logic Diagram
O
3b
O
2b
O
1b
O
0b
O
3a
O
2a
O
1a
O
0a
E
a
E
b
A
0a
A
1a
A
0b
A
1b
Please note that this diagram is provided only for the understanding of logic operations and should not be
used to estimate propagation delays.
Functional Description
The HD74AC139/HD74ACT139 is a high-speed dual 1-of-4 decoder/demultiplexer. The device has two
independent decoders, each of which accepts two binary weighted inputs (A
0
to A
1
) and provides four
mutually exclusive active-Low outputs (
O
0
to
O
3
). 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 HD74AC139/HD74ACT139 generates all four minterms of two variables.
These four minterms are useful in some applications, replacing multiple gate functions as shown in Figure
a, and thereby reducing the number of packages required in a logic network.
Truth Table
Inputs
E
Outputs
O
0
H
A
0
X
A
1
X
O
1
H
O
2
H
O
3
H
H
L
L
L
L
H
H
H
L
H
L
H
L
H
H
L
L
H
H
H
L
H
L
H :
L
X :
H
H
H
H
H
L
High Voltage Level
Low Voltage Level
Immaterial
:
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