SEMICONDUCTOR TECHNICAL DATA
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The MC74LCX138 is a high performance, 1–of–8 decoder/
demultiplexer operating from a 2.7 to 3.6V supply. High impedance TTL
compatible inputs significantly reduce current loading to input drivers
while TTL compatible outputs offer improved switching noise
performance. A VI specification of 5.5V allows MC74LCX138 inputs to be
safely driven from 5V devices. The MC74LCX138 is suitable for memory
address decoding and other TTL level bus oriented applications.
The MC74LCX138 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. This multiple enabled function allows easy parallel
expansion of the device to a 1–of–32 (5 lines to 32 lines) decoder with just
four LCX138 devices and one inverter (See Figure 1). 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.
LOW–VOLTAGE CMOS
DECODER/DEMULTIPLEXER
D SUFFIX
PLASTIC SOIC
CASE 751B–05
16
1
M SUFFIX
PLASTIC SOIC EIAJ
CASE 966–01
16
1
Current drive capability is 24mA at the outputs.
16
• Designed for 2.7 to 3.6V VCC Operation
1
• 5V Tolerant Inputs — Interface Capability With 5V TTL Logic
SD SUFFIX
PLASTIC SSOP
CASE 940B–03
• LVTTL Compatible
• LVCMOS Compatible
16
• 24mA Balanced Output Sink and Source Capability
1
• Near Zero Static Supply Current (10µA) Substantially Reduces System
DT SUFFIX
PLASTIC TSSOP
CASE 948F–01
Power Requirements
• Latchup Performance Exceeds 500mA
• ESD Performance: Human Body Model >2000V; Machine Model >200V
Pinout: 16–Lead Plastic Package (Top View)
VCC
16
O0
O1
O2
O3
O4
O5
O6
15
14
13
12
11
10
9
1
2
3
4
5
6
7
A0
A1
A2
E1
E2
E3
O7
PIN NAMES
Pins
Function
A0–A2
E1–E2
E3
O0–O7
Address Inputs
Enable Inputs
Enable Input
Outputs
8
GND
11/96
Motorola, Inc. 1996
1
REV 1
MC74LCX138
LOGIC DIAGRAM
A2
A1
3
A0
2
7
O7
E1
1
9
10
O6
E2
4
O5
11
E3
5
6
12
O4
13
O3
14
O2
15
O1
INPUTS
O0
OUTPUTS
E1
E2
E3
A0
A1
A2
O0
O1
O2
O3
O4
O5
O6
O7
H
X
X
X
H
X
X
X
L
X
X
X
X
X
X
X
X
X
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
H
H
H
H
L
H
L
H
L
L
H
H
L
L
L
L
L
H
H
H
H
L
H
H
H
H
L
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
H
H
H
H
L
H
L
H
L
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
L
H
H
H
H
L
H
H
H
H
L
H = High Voltage Level; L = Low Voltage Level; X = High or Low Voltage Level and Transitions Are Acceptable; For ICC reasons, DO NOT FLOAT
Inputs
A0
A1
A2
‘04
A3
A4
H
123
A0 A1 A2
E
O0 O1 O2 O3 O4 O5 O6 O7
123
A0 A1 A2
123
E
A0 A1 A2
O0 O1 O2 O3 O4 O5 O6 O7
E
O0 O1 O2 O3 O4 O5 O6 O7
O0
123
A0 A1 A2
E
O0 O1 O2 O3 O4 O5 O6 O7
O31
Figure 1. Expansion to 1–of–32 Decoding
MOTOROLA
2
LCX DATA
BR1339 — REV 3
MC74LCX138
ABSOLUTE MAXIMUM RATINGS*
Symbol
Parameter
Value
Condition
Unit
VCC
DC Supply Voltage
–0.5 to +7.0
V
VI
DC Input Voltage
–0.5 ≤ VI ≤ +7.0
V
VO
DC Output Voltage
–0.5 ≤ VO ≤ VCC + 0.5
Note 1.
V
IIK
DC Input Diode Current
–50
VI < GND
mA
IOK
DC Output Diode Current
–50
VO < GND
mA
+50
VO > VCC
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 Range
–65 to +150
°C
* Absolute maximum continuous ratings are those values beyond which damage to the device may occur. Exposure to these conditions or
conditions beyond those indicated may adversely affect device reliability. Functional operation under absolute–maximum–rated conditions is
not implied.
1. Output in HIGH or LOW State. IO absolute maximum rating must be observed.
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Typ
Max
Unit
2.0
1.5
3.3
3.3
3.6
3.6
V
0
5.5
V
0
VCC
V
VCC
Supply Voltage
VI
Input Voltage
VO
Output Voltage
IOH
HIGH Level Output Current, VCC = 3.0V – 3.6V
–24
mA
IOL
LOW Level Output Current, VCC = 3.0V – 3.6V
24
mA
IOH
HIGH Level Output Current, VCC = 2.7V – 3.0V
–12
mA
IOL
LOW Level Output Current, VCC = 2.7V – 3.0V
TA
Operating Free–Air Temperature
∆t/∆V
Input Transition Rise or Fall Rate, VIN from 0.8V to 2.0V,
VCC = 3.0V
LCX DATA
BR1339 — REV 3
Operating
Data Retention Only
Min
(HIGH or LOW State)
3
12
mA
–40
+85
°C
0
10
ns/V
MOTOROLA
MC74LCX138
DC ELECTRICAL CHARACTERISTICS
TA = –40°C to +85°C
Symbol
Characteristic
Condition
Min
2.0
VIH
HIGH Level Input Voltage (Note 2.)
2.7V ≤ VCC ≤ 3.6V
VIL
LOW Level Input Voltage (Note 2.)
2.7V ≤ VCC ≤ 3.6V
VOH
HIGH Level Output Voltage
VOL
LOW Level Output Voltage
II
Input Leakage Current
ICC
Quiescent Supply Current
Max
Unit
V
0.8
2.7V ≤ VCC ≤ 3.6V; IOH = –100µA
VCC – 0.2
VCC = 2.7V; IOH = –12mA
2.2
VCC = 3.0V; IOH = –18mA
2.4
VCC = 3.0V; IOH = –24mA
2.2
V
V
2.7V ≤ VCC ≤ 3.6V; IOL = 100µA
0.2
V
VCC = 2.7V; IOL= 12mA
0.4
VCC = 3.0V; IOL = 16mA
0.4
VCC = 3.0V; IOL = 24mA
0.55
2.7V ≤ VCC ≤ 3.6V; 0V ≤ VI ≤ 5.5V
±5.0
µA
2.7 ≤ VCC ≤ 3.6V; VI = GND or VCC
10
µA
2.7 ≤ VCC ≤ 3.6V; 3.6 ≤ VI ≤ 5.5V
±10
µA
500
µA
∆ICC
Increase in ICC per Input
2.7 ≤ VCC ≤ 3.6V; VIH = VCC – 0.6V
2. These values of VI are used to test DC electrical characteristics only.
AC CHARACTERISTICS (tR = tF = 2.5ns; CL = 50pF; RL = 500Ω)
Limits
TA = –40°C to +85°C
VCC = 3.0V to 3.6V
Symbol
Parameter
VCC = 2.7V
Waveform
Min
Max
Max
Unit
tPLH
tPHL
Propagation Delay
An to On
1, 2
1.5
1.5
6.0
6.0
7.0
7.0
ns
tPLH
tPHL
Propagation Delay
E1, E2 to On
2
1.5
1.5
6.0
6.0
7.0
7.0
ns
tPLH
tPHL
Propagation Delay
E3 to On
1
1.5
1.5
7.0
7.0
8.0
8.0
ns
CAPACITIVE CHARACTERISTICS
Symbol
Parameter
CIN
Input Capacitance
COUT
Output Capacitance
CPD
Power Dissipation Capacitance
MOTOROLA
Condition
Typical
Unit
VCC = 3.3V, VI = 0V or VCC
7
pF
VCC = 3.3V, VI = 0V or VCC
8
pF
10MHz, VCC = 3.3V, VI = 0V or VCC
25
pF
4
LCX DATA
BR1339 — REV 3
MC74LCX138
2.7V
An, E3
1.5V
2.7V
1.5V
An, E1, E2
1.5V
1.5V
0V
tPHL
0V
tPLH
tPHL
tPLH
VOH
On
1.5V
VOH
1.5V
1.5V
On
1.5V
VOL
VOL
WAVEFORM 1: PROPAGATION DELAYS FOR INVERTING OUTPUTS
WAVEFORM 2: PROPAGATION DELAYS FOR NON–INVERTING OUTPUTS
Figure 1. AC Waveforms
VCC
PULSE
GENERATOR
DUT
RT
CL
RL
CL = 50pF or equivalent (Includes jig and probe capacitance)
RL = R1 = 500Ω or equivalent
RT = ZOUT of pulse generator (typically 50Ω)
Figure 2. Test Circuit
LCX DATA
BR1339 — REV 3
5
MOTOROLA
MC74LCX138
OUTLINE DIMENSIONS
D SUFFIX
PLASTIC SOIC PACKAGE
CASE 751B–05
ISSUE J
–A
–
16
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.
9
–B
–
1
P 8 PL
0.25 (0.010)
8
M
B
M
G
K
DIM
A
B
C
D
F
G
J
K
M
P
R
F
R X 45°
C
–T
SEATING
–
J
M
PLANE
D 16 PL
0.25 (0.010)
M
T
B
S
A
S
MILLIMETERS
MIN
MAX
9.80 10.00
4.00
3.80
1.75
1.35
0.49
0.35
1.25
0.40
1.27 BSC
0.25
0.19
0.25
0.10
7°
0°
6.20
5.80
0.50
0.25
INCHES
MIN
MAX
0.386 0.393
0.150 0.157
0.054 0.068
0.014 0.019
0.016 0.049
0.050 BSC
0.008 0.009
0.004 0.009
0°
7°
0.229 0.244
0.010 0.019
M SUFFIX
PLASTIC SOIC EIAJ PACKAGE
CASE 966–01
ISSUE O
16
NOTES:
1 DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2 CONTROLLING DIMENSION: MILLIMETER.
3 DIMENSIONS D AND E DO NOT INCLUDE MOLD
FLASH OR PROTRUSIONS AND ARE MEASURED
AT THE PARTING LINE. MOLD FLASH OR
PROTRUSIONS SHALL NOT EXCEED 0.15 (0.006)
PER SIDE.
4 TERMINAL NUMBERS ARE SHOWN FOR
REFERENCE ONLY.
5 THE LEAD WIDTH DIMENSION (b) DOES NOT
INCLUDE DAMBAR PROTRUSION. ALLOWABLE
DAMBAR PROTRUSION SHALL BE 0.08 (0.003)
TOTAL IN EXCESS OF THE LEAD WIDTH
DIMENSION AT MAXIMUM MATERIAL CONDITION.
DAMBAR CANNOT BE LOCATED ON THE LOWER
RADIUS OR THE FOOT. MINIMUM SPACE
BETWEEN PROTRUSIONS AND ADJACENT LEAD
TO BE 0.46 ( 0.018).
LE
9
Q1
M_
E HE
L
8
1
DETAIL P
Z
D
e
VIEW P
A
c
A1
b
0.13 (0.005)
MOTOROLA
M
0.10 (0.004)
6
DIM
A
A1
b
c
D
E
e
HE
L
LE
M
Q1
Z
MILLIMETERS
MIN
MAX
--2.05
0.05
0.20
0.35
0.50
0.18
0.27
9.90
10.50
5.10
5.45
1.27 BSC
7.40
8.20
0.50
0.85
1.10
1.50
10 _
0_
0.70
0.90
--0.78
INCHES
MIN
MAX
--0.081
0.002
0.008
0.014
0.020
0.007
0.011
0.390
0.413
0.201
0.215
0.050 BSC
0.291
0.323
0.020
0.033
0.043
0.059
10 _
0_
0.028
0.035
--0.031
LCX DATA
BR1339 — REV 3
MC74LCX138
OUTLINE DIMENSIONS
SD SUFFIX
PLASTIC SSOP PACKAGE
CASE 940B–03
ISSUE B
16X
K REF
0.12 (0.005)
T U
M
S
V
S
0.25 (0.010)
N
L/2
16
9
M
B
L
N
F
PIN 1
IDENT
1
8
DETAIL E
–U–
A
–V–
K
J
0.20 (0.008)
M
T U
ÉÉÉÉ
ÇÇÇÇ
ÇÇÇÇ
ÉÉÉÉ
S
J1
K1
SECTION N–N
0.076 (0.003)
–T–
SEATING
PLANE
–W–
C
D
G
H
LCX DATA
BR1339 — REV 3
DETAIL E
7
NOTES:
6 DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
7 CONTROLLING DIMENSION: MILLIMETER.
8 DIMENSION A DOES NOT INCLUDE MOLD FLASH,
PROTRUSIONS OR GATE BURRS. MOLD FLASH
OR GATE BURRS SHALL NOT EXCEED 0.15
(0.006) PER SIDE.
9 DIMENSION B DOES NOT INCLUDE INTERLEAD
FLASH OR PROTRUSION. INTERLEAD FLASH OR
PROTRUSION SHALL NOT EXCEED 0.15 (0.006)
PER SIDE.
10 DIMENSION K DOES NOT INCLUDE DAMBAR
PROTRUSION/INTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.13 (0.005) TOTAL IN
EXCESS OF K DIMENSION AT MAXIMUM
MATERIAL CONDITION. DAMBAR INTRUSION
SHALL NOT REDUCE DIMENSION K BY MORE
THAN 0.07 (0.002) AT LEAST MATERIAL
CONDITION.
11 TERMINAL NUMBERS ARE SHOWN FOR
REFERENCE ONLY.
12 DIMENSION A AND B ARE TO BE DETERMINED
AT DATUM PLANE –W–.
DIM
A
B
C
D
F
G
H
J
J1
K
K1
L
M
MILLIMETERS
MIN
MAX
6.07
6.33
5.20
5.38
1.73
1.99
0.05
0.21
0.63
0.95
0.65 BSC
0.73
0.90
0.09
0.20
0.09
0.16
0.25
0.38
0.25
0.33
7.65
7.90
0_
8_
INCHES
MIN
MAX
0.238
0.249
0.205
0.212
0.068
0.078
0.002
0.008
0.024
0.037
0.026 BSC
0.028
0.035
0.003
0.008
0.003
0.006
0.010
0.015
0.010
0.013
0.301
0.311
0_
8_
MOTOROLA
MC74LCX138
OUTLINE DIMENSIONS
DT SUFFIX
PLASTIC TSSOP PACKAGE
CASE 948F–01
ISSUE O
16X K REF
0.10 (0.004)
0.15 (0.006) T U
M
T U
V
S
S
S
ÇÇÇ
ÉÉ
ÇÇÇ
ÉÉ
ÇÇÇ
K
K1
2X
L/2
16
9
J1
B
–U–
L
SECTION N–N
J
PIN 1
IDENT.
8
1
N
0.25 (0.010)
0.15 (0.006) T U
S
A
–V–
M
N
NOTES:
1 DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2 CONTROLLING DIMENSION: MILLIMETER.
3 DIMENSION A DOES NOT INCLUDE MOLD FLASH.
PROTRUSIONS OR GATE BURRS. MOLD FLASH
OR GATE BURRS SHALL NOT EXCEED 0.15
(0.006) PER SIDE.
4 DIMENSION B DOES NOT INCLUDE INTERLEAD
FLASH OR PROTRUSION. INTERLEAD FLASH OR
PROTRUSION SHALL NOT EXCEED
0.25 (0.010) PER SIDE.
5 DIMENSION K DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.08 (0.003) TOTAL IN
EXCESS OF THE K DIMENSION AT MAXIMUM
MATERIAL CONDITION.
6 TERMINAL NUMBERS ARE SHOWN FOR
REFERENCE ONLY.
7 DIMENSION A AND B ARE TO BE DETERMINED
AT DATUM PLANE –W–.
F
DETAIL E
–W–
C
0.10 (0.004)
–T– SEATING
PLANE
DETAIL E
H
D
G
DIM
A
B
C
D
F
G
H
J
J1
K
K1
L
M
MILLIMETERS
MIN
MAX
4.90
5.10
4.30
4.50
–––
1.20
0.05
0.15
0.50
0.75
0.65 BSC
0.18
0.28
0.09
0.20
0.09
0.16
0.19
0.30
0.19
0.25
6.40 BSC
0_
8_
INCHES
MIN
MAX
0.193
0.200
0.169
0.177
–––
0.047
0.002
0.006
0.020
0.030
0.026 BSC
0.007
0.011
0.004
0.008
0.004
0.006
0.007
0.012
0.007
0.010
0.252 BSC
0_
8_
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola 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 consequential or incidental damages. “Typical” parameters which may be provided in Motorola
data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”
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◊
MOTOROLA
8
MC74LCX138/D
LCX DATA
BR1339 — REV 3