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參數(shù)資料
| 型號： | 74F251ASJX |
| 英文描述： | 8-Input Digital Multiplexer |
| 中文描述： | 8聲道，數(shù)字復接器 |
| 文件頁數(shù)： | 2/7頁 |
| 文件大?。?/td> | 76K |
| 代理商： | 74F251ASJX |
www.fairchildsemi.com
2
7
Unit Loading/Fan Out
Truth Table
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
Z
=
High Impedance
Functional Description
The 74F257A is a quad 2-input multiplexer with 3-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-position switch where the position of the switch is
determined by the logic levels supplied to the Select input.
The logic equation for the outputs is shown below:
Z
n
=
OE
(I
n
S
+
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
impedance state to avoid high currents that would exceed
the maximum ratings. Designers should ensure the Output
Enable signals to 3-STATE devices whose outputs are tied
together are designed so there is no overlap.
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.
Pin Names
Description
U.L.
Input I
IH
/I
IL
Output I
OH
/I
OL
20
μ
A/
0.6 mA
20
μ
A/
0.6 mA
20
μ
A/
0.6 mA
20
μ
A/
0.6 mA
3 mA/24 mA (20 mA)
HIGH/LOW
1.0/1.0
1.0/1.0
1.0/1.0
1.0/1.0
150/40 (33.3)
S
OE
I
0a
–
I
0d
I
1a
–
I
1d
Z
a
–
Z
d
Common Data Select Input
3-STATE Output Enable Input (Active LOW)
Data Inputs from Source 0
Data Inputs from Source 1
3-STATE Multiplexer Outputs
Output
Select
Data
Output
Enable
Input
Inputs
OE
S
I
0
I
1
Z
H
X
X
X
Z
L
H
X
L
L
L
H
X
H
H
L
L
L
X
L
L
L
H
X
H
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 74F257A | Quad 2-line to 1-line selector/multiplexer, non-inverting 3-State |
| 74F257A | Quad 2-Input Multiplexer with 3-STATE Outputs |
| 74F257APC | Quad 2-Input Multiplexer with 3-STATE Outputs |
| 74F257ASJ | Quad 2-Input Multiplexer with 3-STATE Outputs |
| 74F258A | Quad 2-line to 1-line selector/multiplexer, inverting 3-State |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 74F251PC | 制造商:Freescale Semiconductor 功能描述: |
| 74F253 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual 4-Input Multiplexer with TRI-STATE Outputs |
| 74F253_00 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Dual 4-Input Multiplexer with 3-STATE Outputs |
| 74F253_UKG3026T WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| 74F253_UKH3026B WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
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