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HD74HC257のメーカーはHitachi Semiconductorです、この部品の機能は「Quad. 2-to-1-line Data Selectors/Multiplexers(with noninverted 3-state outputs)」です。 |
部品番号 | HD74HC257 |
| |
部品説明 | Quad. 2-to-1-line Data Selectors/Multiplexers(with noninverted 3-state outputs) | ||
メーカ | Hitachi Semiconductor | ||
ロゴ | |||
このページの下部にプレビューとHD74HC257ダウンロード(pdfファイル)リンクがあります。 Total 9 pages
HD74HC257
Quad. 2-to-1-line Data Selectors/Multiplexers
(with noninverted 3-state outputs)
Description
The large output drive capability coupled with the 3-state feature make this device ideal for interfacing with
bus lines in a bus organized system. When the output control input line is taken high, the outputs of all four
multiplexers are sent into a high impedance state. When the output control line is low, the select input
chooses whether the A or B input is used.
Features
• High Speed Operation: tpd (Data to Y) = 10.5 ns typ (CL = 50 pF)
• High Output Current: Fanout of 15 LSTTL Loads
• Wide Operating Voltage: VCC = 2 to 6 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
Function Table
Inputs
Output Control Select
A
LL
L
LL
H
LH
X
LH
X
HX
X
Notes H: high level, L: low level, X: irrelevant
B
X
X
L
H
X
Outputs
Y
L
H
L
H
High impedance
1 Page Logic Diagram
1A
1B
2A
2B
3A
3B
4A
4B
Select
Output
control
HD74HC257
VCC
1Y
VCC
2Y
VCC
3Y
VCC
4Y
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 : 9 ページ | ||
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PDF ダウンロード | [ HD74HC257 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 |
HD74HC251 | 1 of 8 Data Selectors/Multiplexers (with 3-state outputs) | Hitachi Semiconductor |
HD74HC253 | Dual 4-to-1-line Data Selectors/Multiplexers (with 3-state outputs) | Hitachi Semiconductor |
HD74HC257 | Quad. 2-to-1-line Data Selectors/Multiplexers(with noninverted 3-state outputs) | Hitachi Semiconductor |
HD74HC258 | Quad. 2-to-1-line Data Selectors/Multiplexers(with 3-state outputs) | Hitachi Semiconductor |