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參數(shù)資料
| 型號： | 74AC251 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | 8-Input Multiplexer with 3-STATE Output |
| 中文描述： | 8輸入多路復用器與三態(tài)輸出 |
| 文件頁數(shù)： | 2/9頁 |
| 文件大?。?/td> | 97K |
| 代理商： | 74AC251 |
www.fairchildsemi.com
2
7
Functional Description
This device is a logical implementation of a single-pole, 8-
position switch with the switch position controlled by the
state of three Select inputs, S
0
, S
1
, S
2
. Both true and com-
plementary outputs are provided. The Output Enable input
(OE) is active LOW. When it is activated, the logic function
provided at the output is:
Z
=
OE
(I
0
S
0
S
1
S
2
+
I
1
S
0
S
1
S
2
+
I
2
S
0
S
1
S
2
+
I
3
S
0
S
1
S
2
+
I
4
S
0
S
1
S
2
+
I
5
S
0
S
1
S
2
+
I
6
S
0
S
1
S
2
+
I
7
S
0
S
1
S
2
)
When the Output Enable is HIGH, both outputs are in the
high impedance (High Z) state. This feature allows multi-
plexer expansion by tying the outputs of up to 128 devices
together. When the outputs of the 3-STATE devices are
tied together, all but one device must be in the high imped-
ance state to avoid high currents that would exceed the
maximum ratings. The Output Enable signals should be
designed to ensure there is no overlap in the active-LOW
portion of the enable voltages.
Truth Table
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
Z
=
High Impedance
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
Inputs
Outputs
OE
S
2
S
1
S
0
Z
Z
H
X
X
X
Z
Z
L
L
L
L
I
0
I
1
I
2
I
3
I
4
I
5
I
6
I
7
I
0
I
1
I
2
I
3
I
4
I
5
I
6
I
7
L
L
L
H
L
L
H
L
L
L
H
H
L
H
L
L
L
H
L
H
L
H
H
L
L
H
H
H
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PDF描述 |
|---|---|
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| 74ACT251SC | 8-Input Multiplexer with 3-STATE Output |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 74AC251MTC | 功能描述:編碼器、解碼器、復用器和解復用器 8-Input Multiplexer RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| 74AC251MTCX | 功能描述:編碼器、解碼器、復用器和解復用器 8-Input Multiplexer RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| 74AC251PC | 功能描述:編碼器、解碼器、復用器和解復用器 8-Input Multiplexer RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| 74AC251PC_Q | 功能描述:編碼器、解碼器、復用器和解復用器 8-Input Multiplexer RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| 74AC251SC | 功能描述:編碼器、解碼器、復用器和解復用器 8-Input Multiplexer RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
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