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74F251A Datasheet(Hoja de datos) 2 Page - Fairchild Semiconductor

No. de Pieza. 74F251A
Descripción  8-Input Multiplexer with 3-STATE Outputs
Descarga  6 Pages
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Fabricante  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
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2
Unit Loading/Fan Out
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
= OE •(I
0•S0•S1 •S2 + I1•S0•S 1•S2 +
I2•S0•S1•S2 + I3•S0•S1•S2 +
I4•S0•S1•S2 + I5•S0•S1•S2 +
I6•S0•S1•S2 + I7•S0•S1•S2)
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 3-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
designed to ensure there is no overlap in the active LOW
portion of the enable voltages.
Truth Table
H
= HIGH Voltage Level
L
= LOW Voltage Level
X
= Immaterial
Z
= High Impedance
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 IIH/IIL
HIGH/LOW
Output IOH/IOL
S0–S2
Select Inputs
1.0/1.0
20
µA/−0.6 mA
OE
3-STATE Output Enable Input (Active LOW)
1.0/1.0
20
µA/−0.6 mA
I0–I7
Multiplexer Inputs
1.0/1.0
20
µA/−0.6 mA
Z
3-STATE Multiplexer Output
150/40 (33.3)
−3 mA/24 mA (20 mA)
Z
Complementary 3-STATE Multiplexer Output
150/40 (33.3)
−3 mA/24 mA (20 mA)
Inputs
Outputs
OE
S2
S1
S0
Z
Z
HX
X
X
Z
Z
LL
LL
I0
I0
LL
L
H
I1
I1
LL
H
L
I2
I2
LL
H
H
I3
I3
LH
L
L
I4
I4
LH
L
H
I5
I5
LH
H
L
I6
I6
L
HHH
I7
I7




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