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54FCT138F Folha de dados(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Nome de Peças 54FCT138F
Descrição Electrónicos  1-of-8 Decoder/Demultiplexer
Download  7 Pages
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
Logo NSC - National Semiconductor (TI)

54FCT138F Folha de dados(HTML) 2 Page - National Semiconductor (TI)

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Functional Description
The FCT138 high-speed 1-of-8 decoder/demultiplexer ac-
cepts three binary weighted inputs (A
0,A1,A2) and, when
enabled, provides eight mutually exclusive active-LOW out-
puts (O
0–O7). The FCT138 features three Enable inputs,
two active-LOW (E
1,E2) and one active-HIGH (E3). All out-
puts will be HIGH unless E
1 and E2 are LOW and E3 is
HIGH. This multiple enable function allows easy parallel ex-
pansion of the device to a 1-of-32 (5 lines to 32 lines) de-
coder with just four FCT138 devices and one inverter (see
Figure 1). The FCT138 can be used as an 8-output demulti-
plexer by using one of the active LOW Enable inputs as the
data input and the other Enable inputs as strobes. The En-
able inputs which are not used must be permanently tied to
their appropriate active-HIGH or active-LOW state.
Inputs
Outputs
E
1
E
2
E
3
A
0
A
1
A
2
O
0
O
1
O
2
O
3
O
4
O
5
O
6
O
7
H
XXXXX
HHHHHHHH
X
H
XXXX
HHHHHHHH
X
X
L
X
X
X
HHHHHHHH
LL
H
LLLL
HHHHHHH
L
L
HH
L
L
H
L
HHHHHH
L
L
H
L
H
L
HH
L
HHHHH
L
L
HHH
L
HHH
L
HHHH
L
L
H
L
L
HHHHH
L
HHH
L
L
HH
L
HHHHHH
L
H
H
L
L
H
L
HHHHHHHH
L
H
L
L
HHHHHHHHHHH
L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Logic Diagram
DS100963-4
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
www.national.com
2


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