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54F257A डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - Quad 2-Input Multiplexer - National Semiconductor

भाग संख्या 54F257A
समारोह Quad 2-Input Multiplexer
मैन्युफैक्चरर्स National Semiconductor 
लोगो National Semiconductor लोगो 
पूर्व दर्शन
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54F257A pdf
Unit Loading Fan Out
Pin Names
S
OE
I0a – I0d
I1a – I1d
Za – Zd
Description
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
54F 74F
UL
HIGH LOW
10 10
10 10
10 10
10 10
150 40 (33 3)
Input IIH IIL
Output IOH IOL
20 mA b0 6 mA
20 mA b0 6 mA
20 mA b0 6 mA
20 mA b0 6 mA
b3 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 I0x inputs are selected and when Select is
HIGH the I1x 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
Zn e OE  (In  S a Ion  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
Logic Diagram
Truth Table
Output
Enable
Select
Input
OE S
HX
LH
LH
LL
LL
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
Z e High Impedance
Data
Inputs
I0 I1
XX
XL
XH
LX
HX
Output
Z
Z
L
H
L
H
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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अनुशंसा डेटापत्रक

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54F257Quadruple 2-Line To 1-Line Data Selectors/MultiplexersTexas Instruments
Texas Instruments
54F257AQuad 2-Input MultiplexerNational Semiconductor
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