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SN54LS251 数据表(PDF) 2 Page - Motorola, Inc

部件名 SN54LS251
功能描述  8-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS
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制造商  MOTOROLA [Motorola, Inc]
网页  http://www.freescale.com
标志 MOTOROLA - Motorola, Inc

SN54LS251 数据表(HTML) 2 Page - Motorola, Inc

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5-411
FAST AND LS TTL DATA
SN54/74LS251
FUNCTIONAL DESCRIPTION
The LS251 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 (EO)
is active LOW. When it is activated, the logic function provided
at the output is:
Z = EO ⋅ (I0 ⋅ S0 ⋅ S1 ⋅ S2 + I1 ⋅ S0 ⋅ S1 ⋅ S2 + I2 ⋅ S0 ⋅ S1 ⋅
Z = EO ⋅ S2 + I3 ⋅ S0 ⋅ S1⋅ S2 + I4 ⋅ S0 ⋅ S1 ⋅ S2 + I5 ⋅ S0 ⋅
Z = EO ⋅ 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 multiplexer
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 impedance 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 voltage.
TRUTH TABLE
E0
S2
S1
S0
I0
I1
I2
I3
I4
I5
I6
I7
Z
Z
H
X
X
X
X
X
X
X
X
X
X
X
(Z)
(Z)
L
L
L
L
L
X
X
X
X
X
X
X
H
L
L
L
L
L
H
X
X
X
X
X
X
X
L
H
L
L
L
H
X
L
X
X
X
X
X
X
H
L
L
L
L
H
X
H
X
X
X
X
X
X
L
H
L
L
H
L
X
X
L
X
X
X
X
X
H
L
L
L
H
L
X
X
H
X
X
X
X
X
L
H
L
L
H
H
X
X
X
L
X
X
X
X
H
L
L
L
H
H
X
X
X
H
X
X
X
X
L
H
L
H
L
L
X
X
X
X
L
X
X
X
H
L
L
H
L
L
X
X
X
X
H
X
X
X
L
H
L
H
L
H
X
X
X
X
X
L
X
X
H
L
L
H
L
H
X
X
X
X
X
H
X
X
L
H
L
H
H
L
X
X
X
X
X
X
L
X
H
L
L
H
H
L
X
X
X
X
X
X
H
X
L
H
L
H
H
H
X
X
X
X
X
X
X
L
H
L
L
H
H
H
X
X
X
X
X
X
X
H
L
H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
(Z) = High impedance (Off)
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
VCC
Supply Voltage
4.75
5.0
5.25
V
TA
Operating Ambient Temperature Range
0
25
70
°C
IOH
Output Current — High
– 2.6
mA
IOL
Output Current — Low
24
mA


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