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參數(shù)資料
| 型號： | HD74AC138 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 1-of-8 Decoder/Demultiplexer |
| 中文描述： | 1 - 8解碼器/解復(fù)用器 |
| 文件頁數(shù)： | 3/11頁 |
| 文件大?。?/td> | 66K |
| 代理商： | HD74AC138 |
HD74AC138/HD74ACT138
3
Functional Description
The HD74AC138/HD74ACT138 high-speed 1-of-8 decoder/demultiplexer accepts three binary weighted
inputs (A
0
, A
1
, A
2
) and, when enabled, provides eight mutually exclusive active-LOW outputs (
O
0
to
O
7
).
The HD74AC138/HD74ACT138 features three Enable inputs, two active-Low (
E
1
,
E
2
) and one active-High
(E
3
). All outputs will be High unless
E
1
and
E
2
are Low and E
3
is High. This multiple enabled function
allows easy parallel expansion of the device to a 1-of-32 (5 lines to 32 lines) decoder with just four
HD74AC138/HD74ACT138 devices and one inverter (See Figure a). The HD74AC138/HD74ACT138
can be used as an 8-output demultiplexer by using one of the active Low Enable inputs as the data input
and the other Enable inputs as strobes. The Enables inputs which are not used must be permanently tied to
their appropriate active-High or active-Low state.
Truth Table
Inputs
E
1
H
Outputs
O
0
H
E
2
X
E
3
X
A
0
X
A
1
X
A
2
X
O
1
H
O
2
H
O
3
H
O
4
H
O
5
H
O
6
H
O
7
H
X
H
X
X
X
X
H
H
H
H
H
H
H
H
X
X
L
X
X
X
H
H
H
H
H
H
H
H
L
L
H
L
L
L
L
H
H
H
H
H
H
H
L
L
H
H
L
L
H
L
H
H
H
H
H
H
L
L
H
L
H
L
H
H
L
H
H
H
H
H
L
L
H
H
H
L
H
H
H
L
H
H
H
H
L
L
H
L
L
H
H
H
H
H
L
H
H
H
L
L
H
H
L
H
H
H
H
H
H
L
H
H
L
L
H
L
H
H
H
H
H
H
H
H
L
H
L
H :
L
X :
L
H
H
H
H
H
H
H
H
H
H
H
L
High Voltage Level
Low Voltage Level
Immaterial
:
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HD74ACT138 | 1-of-8 Decoder/Demultiplexer(1線-8線譯碼器/多路分解器) |
| HD74AC139 | Dual 1-of-4 Decoder/Demultiplexer(雙1線-4線譯碼器/多路分解器) |
| 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) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD74AC138/HD74ACT138 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| HD74AC138FP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DECODER/DEMUX|3-TO-8-LINE|AC-CMOS|SOP|16PIN|PLASTIC |
| HD74AC138P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:3-To-8-Line Demultiplexer |
| HD74AC138RP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DECODER/DEMUX|3-TO-8-LINE|AC-CMOS|SOP|16PIN|PLASTIC |
| HD74AC138T | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DECODER/DEMUX|3-TO-8-LINE|AC-CMOS|TSSOP|16PIN|PLASTIC |
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