74LCX138SJX View Datasheet(PDF) - Fairchild Semiconductor
Part Name
Description
Manufacturer
74LCX138SJX Datasheet PDF : 12 Pages
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Connection Diagrams
Pin Assignments for SOIC, SOP, and TSSOP
Pin Descriptions
Pin Names
A0–A2
E1–E2
E3
O0–O7
Description
Address Inputs
Enable Inputs
Enable Input
Outputs
Pad Assignments for DQFN
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.
(Top Through View)
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
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