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參數(shù)資料
| 型號： | SN74LS251D |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 通用總線功能 |
| 英文描述： | Very Low Noise, High Gain, Matched-Pair Dual Low Noise Amplifier |
| 中文描述： | LS SERIES, 8 LINE TO 1 LINE MULTIPLEXER, COMPLEMENTARY OUTPUT, PDSO16 |
| 封裝： | PLASTIC, SOIC-16 |
| 文件頁數(shù)： | 3/8頁 |
| 文件大小： | 125K |
| 代理商： | SN74LS251D |
SN74LS251
http://onsemi.com
3
FUNCTIONAL DESCRIPTION
The LS251 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 assertion and
negation outputs are provided. The Output Enable input
(E
O
) is active LOW. When it is activated, the logic function
provided at the output is:
Z = E
O
(I
0
S
0
S
1
S
2
+ I
1
S
0
S
1
S
2
+ I
2
S
0
S
1
Z = E
O
S
2
+ I
3
S
0
S
1
S
2
+ I
4
S
0
S
1
S
2
+ I
5
S
0
Z = E
O
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
multiplexer 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
impedance 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 voltage.
TRUTH TABLE
E
0
S
2
S
1
S
0
I
0
I
1
I
2
I
3
I
4
I
5
I
6
I
7
Z
Z
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
X
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
X
L
L
L
L
H
H
H
H
L
L
L
L
H
H
H
H
X
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
X
L
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
H
(Z)
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
(Z)
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
(Z) = High impedance (Off)
相關PDF資料 |
PDF描述 |
|---|---|
| SN74LS251N | LOW POWER SCHOTTKY |
| SN74LS251DW | 5V Fixed Gain Amp, for Applications to 1 GHz |
| SN74LS251N | 8-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS |
| SN74LS253 | LOW POWER SCHOTTKY |
| SN74LS253D | LOW POWER SCHOTTKY |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SN74LS251DE4 | 功能描述:編碼器、解碼器、復用器和解復用器 8 To 1 Data Slctr/ Mltplxr W/3-St Otpt 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 |
| SN74LS251DG4 | 功能描述:編碼器、解碼器、復用器和解復用器 8Ln To 1Ln Data Selector 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 |
| SN74LS251DR | 功能描述:編碼器、解碼器、復用器和解復用器 8 To 1 Data Slctr/ Mltplxr W/3-St Otpt 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 |
| SN74LS251DRE4 | 功能描述:編碼器、解碼器、復用器和解復用器 8 To 1 Data Slctr/ Mltplxr W/3-St Otpt 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 |
| SN74LS251DRG4 | 功能描述:編碼器、解碼器、復用器和解復用器 8Ln To 1Ln Data Selector 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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