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參數資料
| 型號： | 74F138 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 1-of-8 Decoder/Demultiplexer(8選1譯碼器/多路分解器) |
| 中文描述： | 1 - 8解碼器/多路解復用器（8選1譯碼器/多路分解器） |
| 文件頁數： | 2/10頁 |
| 文件大?。?/td> | 174K |
| 代理商： | 74F138 |
Unit Loading/Fan Out
54F/74F
Pin Names
Description
U.L.
Input I
IH
/I
IL
Output I
OH
/I
OL
HIGH/LOW
A
0
–A
2
E
1
, E
2
E
3
O
0
–O
7
Address Inputs
Enable Inputs (Active LOW)
Enable Input (Active HIGH)
Outputs (Active LOW)
1.0/1.0
1.0/1.0
1.0/1.0
50/33.3
20
m
A/
b
0.6 mA
20
m
A/
b
0.6 mA
20
m
A/
b
0.6 mA
b
1 mA/20 mA
Functional Description
The ’F138 high-speed 1-of-8 decoder/demultiplexer ac-
cepts three binary weighted inputs (A
0,
A
1,
A
2
) and, when
enabled, provides eight mutually exclusive active LOW out-
puts (O
0
–O
7
). The ’F138 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 enable function allows easy parallel expansion
of the device to a 1-of-32 (5 lines to 32 lines) decoder with
just four ’F138 devices and one inverter (SeeFigure 1). The
’F138 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 Enable inputs which
are not used must be permanently tied to their appropriate
active HIGH or active LOW state.
Truth Table
Inputs
Outputs
E
1
E
2
E
3
A
0
A
1
A
2
O
0
O
1
O
2
O
3
O
4
O
5
O
6
O
7
H
X
X
X
H
X
X
X
L
X
X
X
X
X
X
X
X
X
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
H
H
H
H
L
H
L
H
L
L
H
H
L
L
L
L
L
H
H
H
H
L
H
H
H
H
L
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
H
H
H
H
L
H
L
H
L
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
L
H
H
H
H
L
H
H
H
H
L
H
e
HIGH Voltage Level
L
e
LOW Voltage Level
X
e
Immaterial
2
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相關代理商/技術參數 |
參數描述 |
|---|---|
| 74F138D | 制造商:-- 功能描述:74F138D 制造商:n/a 功能描述:74F138D 制造商:North American Philips Discrete Products Div 功能描述:Demultiplexer/Decoder, 3 To 8 Line, 16 Pin, Plastic, SOP 制造商:NXP Semiconductors 功能描述:74F138D 制造商:Texas Instruments 功能描述:74F138D |
| 74F138DC | 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 |
| 74F138FC | 制造商:Freescale Semiconductor 功能描述:74F138FC |
| 74F138LC | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| 74F138N | 制造商:NXP Semiconductors 功能描述:Demultiplexer/Decoder, 3 To 8 Line, 16 Pin, Plastic, DIP 制造商:Yageo / Phycomp 功能描述:Demultiplexer/Decoder, 3 To 8 Line, 16 Pin, Plastic, DIP |
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