Datasheet JM38510-30701SF, JM38510-30701SE, JM38510-30701BE Datasheet (NSC)

TL/F/6391

54LS138/DM54LS138/DM74LS138,

54LS139/DM54LS139/DM74LS139 Decoders/Demultiplexers

June 1989

54LS138/DM54LS138/DM74LS138,
54LS139/DM54LS139/DM74LS139
Decoders/Demultiplexers

General Description

These Schottky-clamped circuits are designed to be used in
high-performance memory-decoding or data-routing appli­cations, requiring very short propagation delay times. In
high-performance memory systems these decoders can be
used to minimize the effects of system decoding. When
used with high-speed memories, the delay times of these
decoders are usually less than the typical access time of the
memory. This means that the effective system delay intro­duced by the decoder is negligible.

The LS138 decodes one-of-eight lines, based upon the con­ditions at the three binary select inputs and the three enable
inputs. Two active-low and one active-high enable inputs
reduce the need for external gates or inverters when ex­panding. A 24-line decoder can be implemented with no ex­ternal inverters, and a 32-line decoder requires only one
inverter. An enable input can be used as a data input for
demultiplexing applications.

The LS139 comprises two separate two-line-to-four-line de­coders in a single package. The active-low enable input can
be used as a data line in demultiplexing applications.

All of these decoders/demultiplexers feature fully buffered
inputs, presenting only one normalized load to its driving
circuit. All inputs are clamped with high-performance

Schottky diodes to suppress line-ringing and simplify system
design.

Features

Y

Designed specifically for high speed:

Memory decoders
Data transmission systems

Y

LS138 3-to-8-line decoders incorporates 3 enable in­puts to simplify cascading and/or data reception

Y

LS139 contains two fully independent 2-to-4-line decod­ers/demultiplexers

Y

Schottky clamped for high performance

Y

Typical propagation delay (3 levels of logic)

LS138 21 ns
LS139 21 ns

Y

Typical power dissipation

LS138 32 mW
LS139 34 mW

Y

Alternate Military/Aerospace devices (54LS138,
54LS139) are available. Contact a National Semicon­ductor Sales Office/Distributor for specifications.

Connection Diagrams

Dual-in-Line Package

TL/F/6391– 1

Order Number 54LS138DMQB, 54LS138FMQB,

54LS138LMQB, DM54LS138J, DM54LS138W,

DM74LS138M or DM74LS138N

See NS Package Number E20A, J16A,

M16A, N16E or W16A

Dual-in-Line Package

TL/F/6391– 2

Order Number 54LS139DMQB, 54LS139FMQB,

54LS139LMQB, DM54LS139J, DM54LS139W,

DM74LS139M or DM74LS139N

See NS Package Number E20A, J16A,

M16A, N16E or W16A

C

1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.

Absolute Maximum Ratings (Note)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.

Supply Voltage 7V

Input Voltage 7V

Operating Free Air Temperature Range

DM54LS and 54LS

b

55§Ctoa125§C

DM74LS 0

§

Ctoa70§C

Storage Temperature Range

b

65§Ctoa150§C

Note:

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’’
table are not guaranteed at the absolute maximum ratings.
The ‘‘Recommended Operating Conditions’’ table will define
the conditions for actual device operation.

Recommended Operating Conditions

Symbol Parameter

DM54LS138 DM74LS138

Units

Min Nom Max Min Nom Max

V

CC

Supply Voltage 4.5 5 5.5 4.75 5 5.25 V

V

IH

High Level Input Voltage 2 2 V

V

IL

Low Level Input Voltage 0.7 0.8 V

I

OH

High Level Output Current

b

0.4

b

0.4 mA

I

OL

Low Level Output Current 4 8 mA

T

A

Free Air Operating Temperature

b

55 125 0 70

§

C

’LS138 Electrical Characteristics

over recommended operating free air temperature range (unless otherwise noted)

Symbol Parameter Conditions Min

Typ

Max Units

(Note 1)

V

I

Input Clamp Voltage V

CC

e

Min, I

I

eb

18 mA

b

1.5 V

V

OH

High Level Output V

CC

e

Min, I

OH

e

Max, DM54 2.5 3.4

V

Voltage V

IL

e

Max, V

IH

e

Min

DM74 2.7 3.4

V

OL

Low Level Output V

CC

e

Min, I

OL

e

Max, DM54 0.25 0.4

Voltage V

IL

e

Max, V

IH

e

Min

DM74 0.35 0.5 V

I

OL

e

4 mA, V

CC

e

Min DM74 0.25 0.4

I

I

Input Current@Max V

CC

e

Max, V

I

e

7V

0.1 mA

Input Voltage

I

IH

High Level Input Current V

CC

e

Max, V

I

e

2.7V 20 mA

I

IL

Low Level Input Current V

CC

e

Max, V

I

e

0.4V

b

0.36 mA

I

OS

Short Circuit V

CC

e

Max DM54

b

20

b

100

mA

Output Current (Note 2)

DM74

b

20

b

100

I

CC

Supply Current V

CC

e

Max (Note 3) 6.3 10 mA

Note 1: All typicals are at V

CC

e

5V, T

A

e

25§C.

Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.

Note 3: I

CC

is measured with all outputs enabled and open.

2

’LS138 Switching Characteristics

at V

CC

e

5V and T

A

e

25§C (See Section 1 for Test Waveforms and Output Load)

From (Input) Levels

R

L

e

2kX

Symbol Parameter

To (Output) of Delay

C

L

e

15 pF C

L

e

50 pF Units

Min Max Min Max

t

PLH

Propagation Delay Time Select to

21827ns

Low to High Level Output Output

t

PHL

Propagation Delay Time Select to

22740ns

High to Low Level Output Output

t

PLH

Propagation Delay Time Select to

31827ns

Low to High Level Output Output

t

PHL

Propagation Delay Time Select to

32740ns

High to Low Level Output Output

t

PLH

Propagation Delay Time Enable to

21827ns

Low to High Level Output Output

t

PHL

Propagation Delay Time Enable to

22440ns

High to Low Level Output Output

t

PLH

Propagation Delay Time Enable to

31827ns

Low to High Level Output Output

t

PHL

Propagation Delay Time Enable to

32840ns

High to Low Level Output Output

Recommended Operating Conditions

Symbol Parameter

DM54LS139 DM74LS139

Units

Min Nom Max Min Nom Max

V

CC

Supply Voltage 4.5 5 5.5 4.75 5 5.25 V

V

IH

High Level Input Voltage 2 2 V

V

IL

Low Level Input Voltage 0.7 0.8 V

I

OH

High Level Output Current

b

0.4

b

0.4 mA

I

OL

Low Level Output Current 4 8 mA

T

A

Free Air Operating Temperature

b

55 125 0 70

§

C

3

’LS139 Electrical Characteristics

over recommended operating free air temperature range (unless otherwise noted)

Symbol Parameter Conditions Min

Typ

Max Units

(Note 1)

V

I

Input Clamp Voltage V

CC

e

Min, I

I

eb

18 mA

b

1.5 V

V

OH

High Level Output V

CC

e

Min, I

OH

e

Max, DM54 2.5 3.4

V

Voltage V

IL

e

Max, V

IH

e

Min

DM74 2.7 3.4

V

OL

Low Level Output V

CC

e

Min, I

OL

e

Max DM54 0.25 0.4

Voltage V

IL

e

Max, V

IH

e

Min

DM74 0.35 0.5 V

I

OL

e

4 mA, V

CC

e

Min DM74 0.25 0.4

I

I

Input Current@Max V

CC

e

Max, V

I

e

7V

0.1 mA

Input Voltage

I

IH

High Level Input Current V

CC

e

Max, V

I

e

2.7V 20 mA

I

IL

Low Level Input Current V

CC

e

Max, V

I

e

0.4V

b

0.36 mA

I

OS

Short Circuit V

CC

e

Max DM54

b

20

b

100

mA

Output Current (Note 2)

DM74

b

20

b

100

I

CC

Supply Current V

CC

e

Max (Note 3) 6.8 11 mA

Note 1: All typicals are at V

CC

e

5V, T

A

e

25§C.

Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.

Note 3: I

CC

is measured with all outputs enabled and open.

’LS139 Switching Characteristics

at V

CC

e

5V and T

A

e

25§C (See Section 1 for Test Waveforms and Output Load)

From (Input)

R

L

e

2kX

Symbol Parameter

To (Output)

C

L

e

15 pF C

L

e

50 pF Units

Min Max Min Max

t

PLH

Propagation Delay Time Select to

18 27 ns

Low to High Level Output Output

t

PHL

Propagation Delay Time Select to

27 40 ns

High to Low Level Output Output

t

PLH

Propagation Delay Time Enable to

18 27 ns

Low to High Level Output Output

t

PHL

Propagation Delay Time Enable to

24 40 ns

High to Low Level Output Output

Function Tables

LS138

Inputs

Outputs

Enable Select

G1 G2* CBAYOY1Y2Y3Y4Y5Y6Y7

X HXXXHHHHHHHH
L XXXXHHHHHHHH
H L LLLL HHHHHHH
H L LLHH L HHHHHH
H L LHLHHL HHHHH
H L LHHHHHL HHHH
H L HLLHHHHL HHH
H L HLHH HHHH LHH
H L HHLHHHHHH LH
H L HHHH HHHHHHL

*G2eG2AaG2B

H

e

High Level, LeLow Level, XeDon’t Care

LS139

Inputs

Outputs

Enable Select

G BAY0Y1Y2Y3

H XXHHHH

L LLLHHH
L LHHLHH
L HLHHLH
L HHHHH L

HeHigh Level, LeLow Level, XeDon’t Care

4

Logic Diagrams

LS138

TL/F/6391– 3

LS139

TL/F/6391– 4

5

Physical Dimensions inches (millimeters)

Ceramic Leadless Chip Carrier Package (E)

Order Number 54LS138LMQB or 54LS139LMQB

NS Package Number E20A

16-Lead Ceramic Dual-In-Line Package (J)

Order Number 54LS138DMQB, 54LS139DMQB, DM54LS138J or DM54LS139J

NS Package Number J16A

6

Physical Dimensions inches (millimeters) (Continued)

16-Lead Small Outline Molded Package (M)

Order Number DM74LS138M or DM74LS139M

NS Packge Number M16A

16-Lead Molded Dual-In-Line Package (N)

Order Number DM74LS138N or DM74LS139N

NS Package Number N16E

7

54LS138/DM54LS138/DM74LS138,

54LS139/DM54LS139/DM74LS139 Decoders/Demultiplexers

Physical Dimensions inches (millimeters) (Continued)

16-Lead Ceramic Flat Package (W)

Order Number 54LS138FMQB, 54LS139FMQB, DM54LS138W or DM54LS139W

NS Package Number W16A

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with instructions for use provided in the labeling, can effectiveness.
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