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74F251ASC Arkusz danych(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numer części 74F251ASC
Szczegółowy opis  8-Input Multiplexer with TRI-STATE Outputs
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Producent  NSC [National Semiconductor (TI)]
Strona internetowa  http://www.national.com
Logo NSC - National Semiconductor (TI)

74F251ASC Arkusz danych(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
S0–S2
Select Inputs
1010
20 mA b06 mA
OE
TRI-STATE Output Enable Input (Active LOW)
1010
20 mA b06 mA
I0–I7
Multiplexer Inputs
1010
20 mA b06 mA
Z
TRI-STATE Multiplexer Output
15040 (333)
b
3 mA24 mA (20 mA)
Z
Complementary TRI-STATE Multiplexer Output
15040 (333)
b
3 mA24 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 S0 S1 S2 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
(I0S0S1 S2 a I1S0S1S2 a
I2S0S1S2 a I3S0S1S2 a
I4S0S1S2 a I5S0S1S2 a
I6S0S1S2 a I7S0S1S2)
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
S2
S1
S0
Z
Z
H
XXX
Z
Z
L
LLL
I0
I0
LL
L
H
I1
I1
L
LHL
I2
I2
LL
H
H
I3
I3
LH
L
L
I4
I4
L
HLH
I5
I5
LH
H
L
I6
I6
L
HHH
I7
I7
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
Z e High Impedance
Logic Diagram
TLF9504 – 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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