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to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability
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is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
Revised December 2013
74LCX138
Low Voltage 1-of-8 Decoder/Demultiplexer
with 5V Tolerant Inputs
General Description
Features
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.
■ 5V tolerant inputs
The 74LCX138 is fabricated with advanced CMOS technology to achieve high speed operation while maintaining
CMOS low power dissipation.
■ Implements patented noise/EMI reduction circuitry
■ 2.3V to 3.6V VCC specifications provided
■ 6.0 ns tPD max (VCC = 3.3V), 10 µA ICC max
■ Power down high impedance inputs and outputs
■ ±24 mA output drive (VCC = 3.0V)
■ Latch-up performance exceeds 500 mA
■ ESD performance:
Human body model > 2000V
Machine model > 200V
■ Leadless DQFN package
Ordering Code:
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
74LCX138MTC
(Note 1)
MTC16
16-Terminal Depopulated Quad Very-Thin Flat Pack No Leads (DQFN), JEDEC MO-241,
2.5 x 3.5mm
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
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.
2013 Fairchild Semiconductor Corporation
© 2004
DS012417
www.fairchildsemi.com
74LCX138 Low Voltage 1-of-8 Decoder/Demultiplexer with 5V Tolerant Inputs
March 1995
74LCX138
Connection Diagrams
Pin Descriptions
Pin Assignments for SOIC, SOP, and TSSOP
Pin Names
Description
A0–A2
Address Inputs
E1–E2
Enable Inputs
E3
Enable Input
O0–O7
Outputs
DAP
No Connect
Note: DAP (Die Attach Pad)
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 activeLOW 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 demultiplexer 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)
(Bottom View)
Truth Table
Inputs
Outputs
E1
E2
E3
A0
A1
A2
O0
O1
O2
O3
O4
O5
O6
H
X
X
X
X
X
H
H
H
H
H
H
H
H
X
H
X
X
X
X
H
H
H
H
H
H
H
H
X
X
L
X
X
X
H
H
H
H
H
H
H
H
L
L
H
L
L
L
L
H
H
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
H
H
L
H
H
H
H
H
L
L
H
H
H
L
H
H
H
L
H
H
H
H
L
L
H
L
L
H
H
H
H
H
L
H
H
H
L
L
H
H
L
H
H
H
H
H
H
L
H
H
L
L
H
L
H
H
H
H
H
H
H
H
L
H
L
L
H
H
H
H
H
H
H
H
H
H
H
L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
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2
O7
74LCX138
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.
3
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74LCX138
Absolute Maximum Ratings(Note 3)
Symbol
Parameter
Value
Conditions
VCC
Supply Voltage
−0.5 to +7.0
VI
DC Input Voltage
−0.5 to +7.0
VO
DC Output Voltage
IIK
DC Input Diode Current
−50
VI < GND
IOK
DC Output Diode Current
−50
VO < GND
+50
VO > VCC
Units
V
V
−0.5 to VCC + 0.5
Output in HIGH or LOW State (Note 4)
V
mA
mA
IO
DC Output Source/Sink Current
±50
mA
ICC
DC Supply Current per Supply Pin
±100
mA
IGND
DC Ground Current per Ground Pin
±100
mA
TSTG
Storage Temperature
−65 to +150
°C
Recommended Operating Conditions (Note 5)
Symbol
VCC
Parameter
Supply Voltage
VI
Input Voltage
VO
Output Voltage
IOH/IOL
Output Current
TA
Free-Air Operating Temperature
∆t/∆V
Input Edge Rate, VIN = 0.8V to 2.0V, VCC = 3.0V
Min
Max
Operating
2.0
3.6
Data Retention
1.5
3.6
0.0
5.5
V
HIGH or LOW State
0.0
VCC
V
VCC = 3.0V to 3.6V
±24.0
VCC = 2.7V to 3.0V
±12.0
VCC = 2.3V to 2.7V
±8.0
Units
V
mA
−40.0
85.0
°C
0.0
10.0
ns/V
Note 3: The Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated
at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the Absolute Maximum Ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operation.
Note 4: IO Absolute Maximum Rating must be observed.
Note 5: Unused inputs must be held HIGH or LOW. They may not float.
DC Electrical Characteristics
Symbol
Parameter
Conditions
VCC
(V)
VIH
VIL
VOH
VOL
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Voltage
LOW Level Output Voltage
IOH = −100 µA
TA = −40°C to +85°C
Min
2.3 to 2.7
1.7
2.7 to 3.6
2.0
V
2.3 to 2.7
0.7
2.7 to 3.6
0.8
2.3 to 3.6
VCC − 0.2
IOH = -8 mA
2.3
1.8
IOH = −12 mA
2.7
2.2
IOH = −18 mA
3.0
2.4
IOH = −24 mA
3.0
2.2
IOL = 100 µA
2.3 to 3.6
Units
Max
V
V
0.2
IOL = 8mA
2.3
0.6
IOL = 12 mA
2.7
0.4
IOL = 16 mA
3.0
0.4
0.55
V
IOL = 24 mA
3.0
II
Input Leakage Current
0 ≤ VI ≤ 5.5V
2.3 to 3.6
±5.0
µA
IOFF
Power-Off Leakage Current
VI or VO = 5.5V
0.0
10.0
µA
ICC
Quiescent Supply Current
∆ICC
Increase in ICC per Input
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VI = VCC or GND
2.3 to 3.6
10.0
3.6V ≤ VI ≤ 5.5V
2.3 to 3.6
±10.0
VIH = VCC −0.6V
2.3 to 3.6
500
4
µA
µA
TA = −40°C to +85°C, RL = 500Ω
Symbol
Parameter
VCC = 3.3V ± 0.3V
VCC = 2.7V
VCC = 2.5V ± 0.2V
CL = 50pF
CL = 50pF
CL = 30pF
Min
Max
Min
Max
Min
Max
tPHL
Propagation Delay
1.5
6.0
1.5
7.0
1.5
7.2
tPLH
An to Qn
1.5
6.0
1.5
7.0
1.5
7.2
tPHL
Propagation Delay
1.5
6.5
1.5
7.5
1.5
8.4
tPLH
E3 to Qn
1.5
6.5
1.5
7.5
1.5
8.4
tPHL
Propagation Delay
1.5
6.0
1.5
7.0
1.5
7.2
tPLH
E1 or E2 to Qn
1.5
6.0
1.5
7.0
1.5
7.2
tOSHL
Output to Output Skew (Note 6)
1.0
ns
ns
ns
ns
1.0
tOSLH
Units
Note 6: Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. The
specification applies to any outputs switching in the same direction, either HIGH-to-LOW (tOSHL) or LOW-to-HIGH (tOSLH).
Dynamic Switching Characteristics
Symbol
VOLP
VOLV
VCC
TA = 25°C
(V)
Typical
CL = 50 pF, VIH = 3.3V, VIL = 0V
3.3
0.8
CL = 30 pF, VIH = 2.5V, VIL = 0V
2.5
0.6
CL = 50 pF, VIH = 3.3V, VIL = 0V
3.3
−0.8
CL = 30 pF, VIH = 2.5V, VIL = 0V
2.5
−0.6
Parameter
Quiet Output Dynamic Peak VOL
Quiet Output Dynamic Valley VOL
Conditions
Units
V
V
Capacitance
Typical
Units
CIN
Symbol
Input Capacitance
Parameter
VCC = Open, VI = 0V or VCC
Conditions
7.0
pF
COUT
Output Capacitance
VCC = 3.3V, VI = 0V or VCC
8.0
pF
CPD
Power Dissipation Capacitance
VCC = 3.3V, VI = 0V or VCC, f = 10 MHz
25.0
pF
5
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74LCX138
AC Electrical Characteristics
74LCX138
AC Loading and Waveforms Generic for LCX Family
FIGURE 1. AC Test Circuit
(CL includes probe and jig capacitance)
Test
Switch
tPLH, tPHL
Open
tPZL, tPLZ
6V at VCC = 3.3V ± 0.3V
VCC x 2 at VCC = 2.5V ± 0.2V
tPZH, tPHZ
GND
Waveform for Inverting and Non-Inverting Functions
3-STATE Output Low Enable and
Disable Times for Logic
Propagation Delay, Pulse Width and trec Waveforms
Setup Time, Hold TIme and Recovery TIme for Logic
3-STATE Output High Enable and
Disable Times for Logic
trise and tfall
Symbol
VCC
3.3V ± 0.3V
2.7V
2.5V ± 0.2V
Vmi
1.5V
1.5V
VCC/2
Vmo
1.5V
1.5V
VCC/2
Vx
VOL + 0.3V
VOL + 0.3V
VOL + 0.15V
Vy
VOH − 0.3V
VOH − 0.3V
VOH − 0.15V
FIGURE 2. Waveforms
(Input Pulse Characteristics; f = 1MHz, tr = tf = 3ns)
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6
74LCX138
Schematic Diagram Generic for LCX Family
7
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74LCX138
Tape and Reel Specification
Tape Format for DQFN
Package
Designator
BQX
Tape
Number
Cavity
Section
Cavities
Status
Cover Tape
Status
Leader (Start End)
125 (typ)
Empty
Sealed
Carrier
3000
Filled
Sealed
Trailer (Hub End)
75 (typ)
Empty
Sealed
TAPE DIMENSIONS inches (millimeters)
REEL DIMENSIONS inches (millimeters)
Tape Size
12 mm
A
B
C
D
N
W1
W2
13.0
0.059
0.512
0.795
2.165
0.488
0.724
(330.0)
(1.50)
(13.00)
(20.20)
(55.00)
(12.4)
(18.4)
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8
74LCX138
Physical Dimensions inches (millimeters) unless otherwise noted
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
Package Number M16A
9
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74LCX138
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Package Number M16D
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10
74LCX138
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
16-Terminal Depopulated Quad Very-Thin Flat Pack No Leads (DQFN), JEDEC MO-241, 2.5 x 3.5mm
Package Number MLP016E
11
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74LCX138 Low Voltage 1-of-8 Decoder/Demultiplexer with 5V Tolerant Inputs
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Package Number MTC16
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
2. A critical component in any component of a life support
device or system whose failure to perform can be reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the
user.
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12
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are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.
ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent
coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein.
ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards,
regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer
application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not
designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification
in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized
application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and
expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such
claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This
literature is subject to all applicable copyright laws and is not for resale in any manner.
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