74lcx138mx-nl Fairchild Semiconductor, 74lcx138mx-nl Datasheet - Page 2

• Manufacturer Part Number: 74lcx138mx-nl
• Description: 74lcx138 Low Voltage 1-of-8 Decoder/demultiplexerwith 5v Tolerant Inputs
• Manufacturer: Fairchild Semiconductor

www.fairchildsemi.com
Connection Diagrams
Truth Table
H
L
X
LOW Voltage Level
HIGH Voltage Level
Immaterial
Pin Assignments for SOIC, SOP, and TSSOP
Pad Assignments for DQFN
E
H
X
X
L
L
L
L
L
L
L
L
1
(Top Through View)
E
H
X
X
L
L
L
L
L
L
L
L
2
E
X
X
H
H
H
H
H
H
H
H
L
Inputs
3
A
X
X
X
H
H
H
H
L
L
L
L
0
A
H
H
H
H
X
X
X
L
L
L
L
1
A
X
X
X
H
H
H
H
L
L
L
L
2
O
H
H
H
H
H
H
H
H
H
H
L
0
2
Pin Descriptions
Functional Description
The LCX138 high-speed 1-of-8 decoder/demultiplexer
accepts three binary weighted inputs (A
when enabled, provides eight mutually exclusive active-
LOW outputs (O
inputs, two active-LOW (E
All outputs will be HIGH unless E
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.
O
H
H
H
H
H
H
H
H
H
H
L
1
A
E
E
O
O
0
1
3
0
H
H
H
H
H
H
H
H
H
H
L
–A
–E
–O
2
2
2
Pin Names
7
O
Outputs
H
H
H
H
H
H
H
H
H
H
L
0
3
–O
7
). The LCX138 features three Enable
O
H
H
H
H
H
H
H
H
H
H
L
4
1
, E
O
2
H
H
H
H
H
H
H
H
H
H
L
Address Inputs
Enable Inputs
Enable Input
Outputs
) and one active-HIGH (E
5
1
and E
Description
O
H
H
H
H
H
H
H
H
H
H
L
6
2
are LOW and E
0
, A
O
H
H
H
H
H
H
H
H
H
H
L
7
1
, A
2
) and,
3
).
3