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參數(shù)資料
| 型號(hào)： | 74F257APC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | Quad 2-Input Multiplexer with TRI-STATE Outputs |
| 中文描述： | F/FAST SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDIP16 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-16 |
| 文件頁數(shù)： | 2/8頁 |
| 文件大?。?/td> | 157K |
| 代理商： | 74F257APC |
Unit Loading/Fan Out
54F/74F
Pin Names
Description
U.L.
Input I
IH
/I
IL
Output I
OH
/I
OL
HIGH/LOW
S
OE
I
0a
–I
0d
I
1a
–I
1d
Z
a
–Z
d
Common Data Select Input
TRI-STATE Output Enable Input (Active LOW)
Data Inputs from Source 0
Data Inputs from Source 1
TRI-STATE Multiplexer Outputs
1.0/1.0
1.0/1.0
1.0/1.0
1.0/1.0
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
20
m
A/
b
0.6 mA
b
3 mA/24 mA (20 mA)
Functional Description
The ’F257A is a quad 2-input multiplexer with TRI-STATE
outputs. It selects four bits of data from two sources under
control of a Common Data Select input. When the Select
input is LOW, the I
0x
inputs are selected and when Select is
HIGH, the I
1x
inputs are selected. The data on the selected
inputs appears at the outputs in true (non-inverted) form.
The device is the logic implementation of a 4-pole, 2-posi-
tion switch where the position of the switch is determined by
the logic levels supplied to the Select input. The logic equa-
tion for the outputs is shown below:
Z
n
e
OE
#
(I
n
#
S
a
I
on
#
S)
When the Output Enable input (OE) is HIGH, the outputs are
forced to a high impedance OFF state. If the outputs 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. Designers should ensure the Output En-
able signals to TRI-STATE devices whose outputs are tied
together are designed so there is no overlap.
Truth Table
Output
Enable
Select
Input
Data
Inputs
Output
OE
S
I
0
I
1
Z
H
L
L
L
L
X
H
H
L
L
X
X
X
L
H
X
L
H
X
X
Z
L
H
L
H
H
e
HIGH Voltage Level
L
e
LOW Voltage Level
X
e
Immaterial
Z
e
High Impedance
Logic Diagram
TL/F/9507–4
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
2
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| 74F257ASJ | Quad 2-Input Multiplexer with TRI-STATE Outputs |
| 74F257ASC | Quad 2-Input Multiplexer with TRI-STATE Outputs |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 74F257APC_Q | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 Qd 2-Inp 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 |
| 74F257ASC | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 Qd 2-Inp 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 |
| 74F257ASC_Q | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 Qd 2-Inp 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 |
| 74F257ASCSCX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Quad 2-Input Multiplexer with TRI-STATE Outputs |
| 74F257ASCSJX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Quad 2-Input Multiplexer with TRI-STATE Outputs |
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