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HD74AC139のメーカーはHitachi Semiconductorです、この部品の機能は「Dual 1-of-4 Decoder/Demultiplexer」です。 |
部品番号 | HD74AC139 |
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部品説明 | Dual 1-of-4 Decoder/Demultiplexer | ||
メーカ | Hitachi Semiconductor | ||
ロゴ | |||
このページの下部にプレビューとHD74AC139ダウンロード(pdfファイル)リンクがあります。 Total 10 pages
HD74AC139/HD74ACT139
Dual 1-of-4 Decoder/Demultiplexer
Description
The HD74AC139/HD74ACT139 is a high-speed, dual 1-of-4 decoder/demultiplexer. The device has two
independent decoders, each accepting two inputs and providing four mutually-exclusive active-Low
outputs. Each decoder has an active-Low Enable input which can be used as a data input for a 4-output
demultiplexer. Each half of the HD74AC139/HD74ACT139 can be used as a function generator providing
all four minterms of two variables.
Features
• Multifunction Capability
• Two Completely Independent 1-of-4 Decoders
• Active Low Mutually Exclusive Outputs
• Outputs Source/Sink 24 mA
• HD74ACT139 has TTL-Compatible Inputs
1 Page Logic Diagram
Ea
HD74AC139/HD74ACT139
A0a A1a
Eb
A0b A1b
O0a O1a O2a O3a O0b O1b O2b O3b
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 (A0 to A1) and provides four
mutually exclusive active-Low outputs (O0 to 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 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
Outputs
E A0 A1 O0 O1 O2 O3
HX X H H H H
LL L L H H H
LH
L
HL
H
H
LL
H HHL
H
LH H H H H L
H : High Voltage Level
L : Low Voltage Level
X : Immaterial
3
3Pages 19.20
20.00 Max
16
9
1
1.3
1.11 Max
8
Unit: mm
7.62
2.54 ± 0.25
0.48 ± 0.10
0.25
+
–
0.13
0.05
0° – 15°
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
DP-16
Conforms
Conforms
1.07 g
6 Page | |||
ページ | 合計 : 10 ページ | ||
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PDF ダウンロード | [ HD74AC139 データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
部品番号 | 部品説明 | メーカ |
HD74AC138 | 1-of-8 Decoder/Demultiplexer | Hitachi Semiconductor |
HD74AC138 | 1-of-8 Decoder/Demultiplexer | Renesas |
HD74AC139 | Dual 1-of-4 Decoder/Demultiplexer | Hitachi Semiconductor |