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參數(shù)資料
| 型號(hào)： | 74F251APC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | 8-Input Multiplexer with TRI-STATE Outputs |
| 中文描述： | F/FAST SERIES, 8 LINE TO 1 LINE MULTIPLEXER, COMPLEMENTARY OUTPUT, PDIP16 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-16 |
| 文件頁(yè)數(shù)： | 2/8頁(yè) |
| 文件大?。?/td> | 165K |
| 代理商： | 74F251APC |
Unit Loading/Fan Out
54F/74F
Pin Names
Description
U.L.
Input I
IH
/I
IL
Output I
OH
/I
OL
HIGH/LOW
S
0
–S
2
OE
I
0
–I
7
Z
Z
Select Inputs
TRI-STATE Output Enable Input (Active LOW)
Multiplexer Inputs
TRI-STATE Multiplexer Output
Complementary TRI-STATE Multiplexer Output
1.0/1.0
1.0/1.0
1.0/1.0
150/40 (33.3)
150/40 (33.3)
20
m
A/
b
0.6 mA
20
m
A/
b
0.6 mA
20
m
A/
b
0.6 mA
b
3 mA/24 mA (20 mA)
b
3 mA/24 mA (20 mA)
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 assertion and
negation outputs are provided. The Output Enable input
(OE) is active LOW. When it is activated, the logic function
provided at the output is:
Z
e
OE
#
(I
0
#
S
0
#
S
1
#
S
2
a
I
1
#
S
0
#
S
1
#
S
2
a
I
2
#
S
0
#
S
1
#
S
2
a
I
3
#
S
0
#
S
1
#
S
2
a
I
4
#
S
0
#
S
1
#
S
2
a
I
5
#
S
0
#
S
1
#
S
2
a
I
6
#
S
0
#
S
1
#
S
2
a
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 TRI-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 de-
signed to ensure there is no overlap in the active LOW por-
tion of the enable voltages.
Truth Table
Inputs
Outputs
OE
S
2
S
1
S
0
Z
Z
H
L
L
L
X
L
L
L
X
L
L
H
X
L
H
L
Z
I
0
I
1
I
2
Z
I
0
I
1
I
2
L
L
L
L
L
L
H
H
H
H
H
L
L
H
H
H
L
H
L
H
I
3
I
4
I
5
I
6
I
7
I
3
I
4
I
5
I
6
I
7
H
e
HIGH Voltage Level
L
e
LOW Voltage Level
X
e
Immaterial
Z
e
High Impedance
Logic Diagram
TL/F/9504–4
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
2
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 74F251ASC | 8-Input Multiplexer with TRI-STATE Outputs |
| 74F251ASJ | 8-Input Multiplexer with TRI-STATE Outputs |
| 74F251 | 8-Input Multiplexer with 3-STATE Outputs |
| 74F251A | 8-Input Multiplexer with 3-STATE Outputs |
| 74F251APC | 8-Input Multiplexer with 3-STATE Outputs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 74F251APC_Q | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)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(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 |
| 74F251ASC | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)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(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 |
| 74F251ASC_Q | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)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(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 |
| 74F251ASCX | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)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(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 |
| 74F251ASJ | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)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(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 |
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