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參數(shù)資料
| 型號(hào)： | HD74AC139 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Dual 1-of-4 Decoder/Demultiplexer(雙1線-4線譯碼器/多路分解器) |
| 中文描述： | 雙1 - 4解碼器/多路解復(fù)用器（雙1線-4線譯碼器/多路分解器） |
| 文件頁數(shù)： | 3/10頁 |
| 文件大小： | 61K |
| 代理商： | HD74AC139 |
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
:
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HD74ACT139 | Dual 1-of-4 Decoder/Demultiplexer(雙1線-4線譯碼器/多路分解器) |
| HD74AC14 | Hex Inverter Schmitt Trigger(施密特觸發(fā)六反相器) |
| HD74AC153 | Dual 4-Input Multiplexer(雙4輸入多路復(fù)用器) |
| HD74AC157 | Quad 2-Input Multiplexer(四2輸入多路復(fù)用器) |
| HD74AC158 | Quad 2-Input Multiplexer(四2輸入多路復(fù)用器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD74AC139/HA74ACT139 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| HD74AC139FP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2-To-4-Line Demultiplexer |
| HD74AC139P | 制造商:Renesas Electronics 功能描述:74AC Dual 2-to-4 Line Decoder Bulk |
| HD74AC139RP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DECODER/DEMUX|2-TO-4-LINE|AC-CMOS|SOP|16PIN|PLASTIC |
| HD74AC139T | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DECODER/DEMUX|2-TO-4-LINE|AC-CMOS|TSSOP|16PIN|PLASTIC |
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