74LCX138(2001) View Datasheet(PDF) - Fairchild Semiconductor
Part Name
Description
Manufacturer
74LCX138
(Rev.:2001)
(Rev.:2001)
Fairchild Semiconductor
74LCX138 Datasheet PDF : 9 Pages
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Functional Description
The LCX138 high-speed 1-of-8 decoder/demultiplexer
accepts three binary weighted inputs (A0, A1, A2) and,
when enabled, provides eight mutually exclusive active-
LOW outputs (O0–O7). The LCX138 features three Enable
inputs, two active-LOW (E1, E2) and one active-HIGH (E3).
All outputs will be HIGH unless E1 and E2 are LOW and E3
is HIGH. The LCX138 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
Enable inputs which are not used must be permanently tied
to their appropriate active-HIGH or active-LOW state.
Truth Table
Inputs
Outputs
E1 E2 E3 A0 A1 A2 O0 O1 O2 O3 O4 O5 O6 O7
HX X X X X HHHHHHHH
X HX X X X HHHHHHHH
XX L XXXHHHHHHHH
L
L
H
L
L
L
L
HH
H
H
H
H
H
L
L
H
H
L
L
H
L
H
H
H
H
H
H
L
L
H
L
H
L
HH
L
H
H
H
H
H
L
L
H
H
H
L
HHH
L
H
H
H
H
L
L
H
L
L
H
HHH
H
L
H
H
H
L
L
H
H
L
H
HHH
H
H
L
H
H
L
L
H
L
H
H
HHH
H
H
H
L
H
L
L
H
H
H
H
HHH
H
H
H
H
L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
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.
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