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參數(shù)資料
| 型號(hào)： | SN74LS251N |
| 廠商： | MOTOROLA INC |
| 元件分類(lèi)： | 通用總線功能 |
| 英文描述： | 8-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS |
| 中文描述： | LS SERIES, 8 LINE TO 1 LINE MULTIPLEXER, COMPLEMENTARY OUTPUT, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁(yè)數(shù)： | 3/8頁(yè) |
| 文件大?。?/td> | 125K |
| 代理商： | SN74LS251N |
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)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SN74LS251N | 制造商:Texas Instruments 功能描述:Logic - Multiplexer and Demultiplexer I |
| SN74LS251N3 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| SN74LS251NDS | 制造商:Motorola Inc 功能描述:LOGIC MUX, SINGLE, 8-INPUT, LS-TTL, 16 Pin, Plastic, DIP |
| SN74LS251NE4 | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)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(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| SN74LS251NS | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
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