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74F257ASC Datenblatt(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Teilenummer 74F257ASC
Bauteilbeschribung  Quad 2-Input Multiplexer with TRI-STATE Outputs
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Hersteller  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

74F257ASC Datenblatt(HTML) 2 Page - National Semiconductor (TI)

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Unit LoadingFan Out
54F74F
Pin Names
Description
UL
Input IIH IIL
HIGHLOW
Output IOH IOL
S
Common Data Select Input
1010
20 mA b06 mA
OE
TRI-STATE Output Enable Input (Active LOW)
1010
20 mA b06 mA
I0a–I0d
Data Inputs from Source 0
1010
20 mA b06 mA
I1a–I1d
Data Inputs from Source 1
1010
20 mA b06 mA
Za–Zd
TRI-STATE Multiplexer Outputs
15040 (333)
b
3 mA24 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
Truth Table
Output
Select
Data
Output
Enable
Input
Inputs
OE
SI0
I1
Z
HX
X
X
Z
LH
X
L
L
LH
X
H
H
LL
L
X
L
LL
H
X
H
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
Z e High Impedance
Logic Diagram
TLF9507 – 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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