© 2004 Fairchild Semiconductor Corporation DS012417 www.fairchildsemi.com
March 1995
Revised February 2004
7
4
LCX138 Low
V
o
lt
age 1-
of
-8
Decoder/
Demult
ipl
exer
wit
h
5
V
T
o
le
rant
I
nputs
74LCX138
Low Voltage 1-of-8 Decoder/Demultiplexer
with 5V Tolerant Inputs
General Description
The LCX138 is a high-speed 1-of-8 decoder/demultiplexer.
This device is ideally suited for high-speed memory chip
select address decoding. The multiple input enables allow
parallel expansion to a 1-of-24 decoder using just three
LCX138 devices or a 1-of-32 decoder using four LCX138
devices and one inverter.
The 74LCX138 is fabricated with advanced CMOS technol-
ogy to achieve high speed operation while maintaining
CMOS low power dissipation.
Features
a73 5V tolerant inputs
a73 2.3V to 3.6V V
CC
specifications provided
a73 6.0 ns t
PD
max (V
CC
= 3.3V), 10 µA I
CC
max
a73 Power down high impedance inputs and outputs
a73 ±24 mA output drive (V
CC
= 3.0V)
a73 Implements patented noise/EMI reduction circuitry
a73 Latch-up performance exceeds 500 mA
a73 ESD performance:
Human body model > 2000V
Machine model > 200V
a73 Leadless DQFN package

Ordering Code:
Note 1: Devices also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Note 2: DQFN package available in Tape and Reel only.
Order Number
Package
Number
Package Description
74LCX138M
(Note 1)
M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
74LCX138SJ
(Note 1)
M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74LCX138BQX
(Note 2)
MLP016E 16-Terminal Depopulated Quad Very-Thin Flat Pack No Leads (DQFN), JEDEC MO-241,
2.5 x 3.5mm
74LCX138MTC
(Note 1)
MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide