Datasheet MC74LCX138MEL, MC74LCX138SD, MC74LCX138M, MC74LCX138D, MC74LCX138DR2 Datasheet (Motorola)



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
features three Enable inputs, two active–LOW (E1
active–HIGH (E3). All outputs will be HIGH unless E1
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.

Current drive capability is 24mA at the outputs.

–O7). The LCX138

, E2) and one

and E2 are LOW,



LOW–VOLTAGE CMOS

DECODER/DEMULTIPLEXER

D SUFFIX

16

1

16

1

PLASTIC SOIC
CASE 751B–05

M SUFFIX

PLASTIC SOIC EIAJ

CASE 966–01

• Designed for 2.7 to 3.6V V

Operation

CC

• 5V Tolerant Inputs — Interface Capability With 5V TTL Logic

• LVTTL Compatible

• LVCMOS Compatible

• 24mA Balanced Output Sink and Source Capability

• Near Zero Static Supply Current (10µA) Substantially Reduces System

Power Requirements

• Latchup Performance Exceeds 500mA

• ESD Performance: Human Body Model >2000V; Machine Model >200V

Pinout: 16–Lead Plastic Package (Top View)

V

CC

A0 A1 A2 E1 E2 E3 O7 GND

O1 O2 O3 O4 O5 O6

O0

1516 14 13 12 11 10

21 34567

9

8

16

16

PIN NAMES

Pins

A0–A2
E1

–E2
E3
O0–O7

1

1

Function

Address Inputs
Enable Inputs
Enable Input
Outputs

SD SUFFIX

PLASTIC SSOP

CASE 940B–03

DT SUFFIX

PLASTIC TSSOP

CASE 948F–01

11/96

 Motorola, Inc. 1996

1

REV 1

MC74LCX138

LOGIC DIAGRAM

A2 A1 A0 E1 E2 E3

654123

7 9 10 11 12 13 14 15

O7 O6 O5 O4 O3 O2 O1 O0

INPUTS OUTPUTS

E1 E2 E3 A0 A1 A2 O0 O1 O2 O3 O4 O5 O6 O7

H
X
X

L
L
L
L

L
L
L
L

H = High Voltage Level; L = Low V oltage Level; X = High or Low V oltage Level and T ransitions Are Acceptable; For ICC reasons, DO NOT FLOAT
Inputs

X

H

X
L

L
L
L

L
L
L
L

X
X
L

H
H
H
H

H
H
H
H

X
X
X

L
H
L
H

L
H
L
H

X
X
X

L
L
H
H

L
L
H
H

X
X
X

L
L
L
L

H
H
H
H

H
H
H

L
H
H
H

H
H
H
H

H
H
H

H

L
H
H

H
H
H
H

H
H
H

H
H

L

H
H

H
H
H

H
H
H

H
H
H

L

H
H
H
H

H
H
H

H
H
H
H

L
H
H
H

H
H
H

H
H
H
H

H
L
H
H

H
H
H

H
H
H
H

H
H

L

H

H
H
H

H
H
H
H

H
H
H

L

A0
A1
A2

A3
A4

A0 A1 A2 E

O0 O1 O2 O3 O4 O5 O6 O7

O0

H

123 123 123 123

A0 A1 A2 E

O0 O1 O2 O3 O4 O5 O6 O7

A0 A1 A2 E

O0 O1 O2 O3 O4 O5 O6 O7

A0 A1 A2 E

O0 O1 O2 O3 O4 O5 O6 O7

‘04

O31

Figure 1. Expansion to 1–of–32 Decoding

MOTOROLA LCX DATA

2

BR1339 — REV 3

MC74LCX138

ABSOLUTE MAXIMUM RATINGS*

Symbol Parameter Value Condition Unit

V

CC

V

I

V

O

I

IK

I

OK

I

O

I

CC

I

GND

T

STG

* 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.

DC Supply Voltage –0.5 to +7.0 V
DC Input Voltage –0.5 ≤ VI ≤ +7.0 V
DC Output Voltage –0.5 ≤ VO ≤ VCC + 0.5 Note 1. V
DC Input Diode Current –50 VI < GND mA
DC Output Diode Current –50 VO < GND mA

+50 VO > V
DC Output Source/Sink Current ±50 mA
DC Supply Current Per Supply Pin ±100 mA
DC Ground Current Per Ground Pin ±100 mA
Storage Temperature Range –65 to +150 °C

CC

mA

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Min Typ Max Unit

V

CC

V

I

V

O

I

OH

I

OL

I

OH

I

OL

T

A

∆t/∆V Input Transition Rise or Fall Rate, VIN from 0.8V to 2.0V ,

Supply Voltage Operating

Data Retention Only
Input Voltage 0 5.5 V
Output Voltage (HIGH or LOW State) 0 V
HIGH Level Output Current, VCC = 3.0V – 3.6V –24 mA
LOW Level Output Current, VCC = 3.0V – 3.6V 24 mA
HIGH Level Output Current, VCC = 2.7V – 3.0V –12 mA
LOW Level Output Current, VCC = 2.7V – 3.0V 12 mA
Operating Free–Air Temperature –40 +85 °C

VCC = 3.0V

2.0

1.5

0 10 ns/V

3.3

3.3

3.6

3.6

CC

V

V

LCX DATA
BR1339 — REV 3

3 MOTOROLA

MC74LCX138

DC ELECTRICAL CHARACTERISTICS

TA = –40°C to +85°C

Symbol Characteristic Condition Min Max Unit

V

IH

V

IL

V

OH

V

OL

I

I

I

CC

∆I

CC

2. These values of VI are used to test DC electrical characteristics only.

HIGH Level Input Voltage (Note 2.) 2.7V ≤ VCC ≤ 3.6V 2.0 V
LOW Level Input Voltage (Note 2.) 2.7V ≤ VCC ≤ 3.6V 0.8 V
HIGH Level Output Voltage 2.7V ≤ VCC ≤ 3.6V; IOH = –100µA VCC– 0.2 V

VCC = 2.7V; IOH = –12mA 2.2
VCC = 3.0V; IOH = –18mA 2.4
VCC = 3.0V; IOH = –24mA 2.2

LOW Level Output Voltage 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

Input Leakage Current 2.7V ≤ VCC ≤ 3.6V; 0V ≤ VI ≤ 5.5V ±5.0 µA
Quiescent Supply Current

Increase in ICC per Input 2.7 ≤ VCC ≤ 3.6V; VIH = VCC – 0.6V 500 µA

2.7 ≤ VCC ≤ 3.6V; VI = GND or V

2.7 ≤ VCC ≤ 3.6V; 3.6 ≤ VI ≤ 5.5V ±10 µA

CC

10 µA

AC CHARACTERISTICS (tR = tF = 2.5ns; CL = 50pF; RL = 500Ω)

Limits

TA = –40°C to +85°C

VCC = 3.0V to 3.6V VCC = 2.7V

Symbol Parameter Waveform Min Max Max Unit

t

PLH

t

PHL

t

PLH

t

PHL

t

PLH

t

PHL

Propagation Delay
An to On

Propagation Delay

, E2 to On

E1
Propagation Delay

E3 to On

1, 2 1.5

1.5

2 1.5

1.5

1 1.5

1.5

6.0

6.0

6.0

6.0

7.0

7.0

7.0

7.0

7.0

7.0

8.0

8.0

CAPACITIVE CHARACTERISTICS

Symbol Parameter Condition Typical Unit

C
C
C

IN
OUT
PD

Input Capacitance VCC = 3.3V, VI = 0V or V
Output Capacitance VCC = 3.3V, VI = 0V or V
Power Dissipation Capacitance 10MHz, VCC = 3.3V, VI = 0V or V

CC
CC

CC

7 pF
8 pF

25 pF

ns

ns

ns

MOTOROLA LCX DATA

4

BR1339 — REV 3

MC74LCX138

2.7V

An, E3

t

PHL

On

WAVEFORM 1: PROPAGATION DELAYS FOR INVERTING OUTPUTS

1.5V 1.5V

1.5V1.5V
0V

t

PLH

V

V

Figure 1. AC Waveforms

PULSE

GENERATOR

CL = 50pF or equivalent (Includes jig and probe capacitance)
RL = R1 = 500Ω or equivalent
RT = Z

of pulse generator (typically 50Ω)

OUT

OH

OL

An, E1

, E2

t

PHL

On

WAVEFORM 2: PROPAGA TION DELAYS FOR NON–INVERTING OUTPUTS

V

CC

DUT

R

T

1.5V 1.5V

C

R

L

L

1.5V1.5V

t

PLH

2.7V

0V

V

OH

V

OL

Figure 2. T est Circuit

LCX DATA
BR1339 — REV 3

5 MOTOROLA

MC74LCX138

1

–T

SEATING

–

PLANE

–A

–

G

D

16 PL

0.25 (0.010) T B A

OUTLINE DIMENSIONS

D SUFFIX

PLASTIC SOIC PACKAGE

CASE 751B–05

ISSUE J

916

–B

P 8 PL

–

8

0.25 (0.010) B

K

M M

R X 45°

F

C

M

M

S S

J

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.

MILLIMETERS INCHES

MIN MINMAX MAX

DIM

A

9.80

B

3.80

C

1.35

D

0.35

F

0.40

1.27 BSC 0.050 BSC

G
J

0.19

K

0.10

M

0

°

P

5.80

R

0.25

10.00

4.00

1.75

0.49

1.25

0.25

0.25
7

6.20

0.50

0.386

0.393

0.150

0.157

0.054

0.068

0.014

0.019

0.016

0.049

0.008

0.009

0.004

0.009

0

7

°

°

°

0.229

0.010

0.244

0.019

16 9

1

Z

D

e

b

0.13 (0.005)

M

8

A

A

0.10 (0.004)

PLASTIC SOIC EIAJ PACKAGE

M SUFFIX

CASE 966–01

ISSUE O

L

E

Q

1

HEE

_

M

L

DETAIL P

VIEW P

c

1

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).

MILLIMETERS
DIM MIN MAX MIN MAX
A

--- 2.05 --- 0.081

A

0.05 0.20 0.002 0.008

1

b

0.35 0.50 0.014 0.020

c

0.18 0.27 0.007 0.011

D

9.90 10.50 0.390 0.413

E

5.10 5.45 0.201 0.215

e

1.27 BSC 0.050 BSC

H

7.40 8.20 0.291 0.323

E

L

0.50 0.85 0.020 0.033

L

1.10 1.50 0.043 0.059

E

M

0

_

Q

0.70 0.90 0.028 0.035

1

Z

--- 0.78 --- 0.031

10

_

INCHES

0

_

10

_

MOTOROLA LCX DATA

6

BR1339 — REV 3

OUTLINE DIMENSIONS

SD SUFFIX

PLASTIC SSOP PACKAGE

CASE 940B–03

ISSUE B

MC74LCX138

0.076 (0.003)

SEATING

–T–

PLANE

L/2

L

PIN 1
IDENT

0.20 (0.008) T

C

D

K16X REF

0.12 (0.005) V

16 9

A

–V–

M

S

U

G

H

M

S

U

T

S

0.25 (0.010)

N

M

B

N

F

81

–U–

J

DETAIL E

K

J1

K1

SECTION N–N

–W–

DETAIL E

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–.

MILLIMETERS

DIMAMIN MAX MIN MAX

6.07 6.33 0.238 0.249

B 5.20 5.38 0.205 0.212
C 1.73 1.99 0.068 0.078
D 0.05 0.21 0.002 0.008
F 0.63 0.95 0.024 0.037
G 0.65 BSC 0.026 BSC
H 0.73 0.90 0.028 0.035
J 0.09 0.20 0.003 0.008

J1 0.09 0.16 0.003 0.006

K 0.25 0.38 0.010 0.015

K1 0.25 0.33 0.010 0.013

L 7.65 7.90 0.301 0.311
M 0 8 0 8

____

INCHES

LCX DATA
BR1339 — REV 3

7 MOTOROLA

MC74LCX138

OUTLINE DIMENSIONS

0.10 (0.004)

SEATING

–T–

PLANE

L

U0.15 (0.006) T

PIN 1
IDENT.

U0.15 (0.006) T

D

S

2X L/2

S

PLASTIC TSSOP PACKAGE

DT SUFFIX

CASE 948F–01

ISSUE O

16X REFK

0.10 (0.004) V

M

S

U

T

S

K

K1

16

9

J1

B

–U–

1

8

J

N

A

SECTION N–N

0.25 (0.010)

M

–V–

N

F

DETAIL E

C

DETAIL E

H

G

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–.

DIM MIN MAX MIN MAX

A 4.90 5.10 0.193 0.200
B 4.30 4.50 0.169 0.177
C ––– 1.20 ––– 0.047
D 0.05 0.15 0.002 0.006
F 0.50 0.75 0.020 0.030

–W–

G 0.65 BSC 0.026 BSC
H 0.18 0.28 0.007 0.011

J 0.09 0.20 0.004 0.008

J1 0.09 0.16 0.004 0.006

K 0.19 0.30 0.007 0.012

K1 0.19 0.25 0.007 0.010

L 6.40 BSC 0.252 BSC
M 0 8 0 8

____

INCHESMILLIMETERS

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. “T ypical” 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”
must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of
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MOTOROLA LCX DATA

8

◊

MC74LCX138/D

BR1339 — REV 3