Texas Instruments SN74ALS137AN, SN74ALS137AD, SN74ALS137ADR, SNJ54ALS137AJ, SNJ54ALS137AW Datasheet

SN54ALS137A, SN74ALS137A, SN74AS137

OUTPUTS

3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

WITH ADDRESS LATCHES

SDAS203C – APRIL 1982 – REVISED JANUARY 1995

• Combines Decoder and 3-Bit Address

Latch

• Incorporates Two Output Enables to

Simplify Cascading

• Package Options Include Plastic Small-

Outline (D) Packages, Ceramic Chip
Carriers (FK), and Standard Plastic (N) and
Ceramic (J) 300-mil DIPs

description

The SN54ALS137A, SN74ALS137A, and
SN74AS137 are 3-line to 8-line decoders/
demultiplexers with latches on the three address
inputs. When the latch-enable (LE
the devices act as decoders/demultiplexers.
When LE

goes from low to high, the address
present at the select (A, B, and C) inputs is stored
in the latches. Further address changes are
ignored as long as LE

remains high. The
output-enable controls (G1 and G2
outputs independently of the select or
latch-enable inputs. All of the outputs are forced
high if G1 is low or G2

is high. These devices are
ideally suited for implementing glitch-free
decoders in strobed (stored-address) applications
in bus-oriented systems.

The SN54ALS137A is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74ALS137A and SN74AS137
are characterized for operation from 0°C to 70°C.

) input is low,

) control the

SN74ALS137A, SN74AS137 ...D OR N PACKAGE

SN54ALS137A ...J PACKAGE

(TOP VIEW)

A

1

B

2

C

3

LE

4

G2

5

G1

6

Y7

7

GND

SN54ALS137A . . . FK PACKAGE

8

(TOP VIEW)

BANC

3 2 1 20 19

C

4
5

LE

6

NC

7

G2

8

G1

910111213

Y7

GND

NC – No internal connection

16
15
14
13
12
11
10

NC

V

CC

Y0
Y1
Y2
Y3
Y4
Y5
Y6

9

CC

Y0

V

Y1

18
17

Y2

16

NC

15

Y3

14

Y4

Y6

Y5

INPUTS

ENABLE SELECT

LE G1 G2 C B A Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7

X X H X X X H H H H H H H H
X LXXXXHHHHHHHH
LHLL LLLHHHHHHH
LHLLLHHLHHHHHH
LHLLHLHHLHHHHH
LHLLHHHHHLHHHH
LHLHL LHHHHLHHH
LHLHLHHHHHHLHH
LHLHHLHHHHHHLH
LHLHHHHHHHHHHL
HHLXXX Outputs corresponding to stored address = L; all others = H

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

FUNCTION TABLE

Copyright  1995, Texas Instruments Incorporated

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

1

SN54ALS137A, SN74ALS137A, SN74AS137
3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
WITH ADDRESS LATCHES

SDAS203C – APRIL 1982 – REVISED JANUARY 1995

X/Y

†

15

0
1
2
3
4
5
6
7

14
13
12
11
10

Y0
Y1
Y2
Y3
Y4
Y5

9

Y6

7

Y7

LE

G1

G2

4

1

A

2

B

3

C

6
5

logic symbols (alternatives)

4

LE

1

A

2

B

3

C

6

G1

5

G2

†

These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.

Pin numbers shown are for the D, J, and N packages.

C8

8D

&

1
2
4

EN

logic diagram (positive logic)

1

A

C8

8D

&

DMUX

0

2

15

0
1
2

0

G

7

3
4
5
6
7

15

Y0

14

Y1

14
13
12
11
10

Y0
Y1
Y2
Y3
Y4
Y5

9

Y6

7

Y7

LE

G2

G1

2

B

3

C

4

5

6

Select

Inputs

Latch

Enable

Output

Enables

Pin numbers shown are for the D, J, and N packages.

13

12

11

10

Y2

Y3

Data
Outputs

Y4

Y5

9

Y6

7

Y7

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

SN54ALS137A, SN74ALS137A, SN74AS137

UNIT

PARAMETER

TEST CONDITIONS

UNIT

V

V

4.5 V

V

3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

WITH ADDRESS LATCHES

SDAS203C – APRIL 1982 – REVISED JANUARY 1995

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

Supply voltage, V
Input voltage, V
Operating free-air temperature range, T

Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

†

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CC

7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I

: SN54ALS137A –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . .

A

SN74ALS137A 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

recommended operating conditions

SN54ALS137A SN74ALS137A

MIN NOM MAX MIN NOM MAX

V
V
V
I
I
t
t
t
T

CC
IH

IL
OH
OL
w
su
h

A

Supply voltage 4.5 5 5.5 4.5 5 5.5 V
High-level input voltage 2 2 V
Low-level input voltage 0.7 0.8 V
High-level output current –0.4 –0.4 mA
Low-level output current 4 8 mA
Pulse duration, LE low 15 10 ns
Setup time at A, B, and C before LE↑ 15 10 ns
Hold time at A, B, and C after LE↑ 5 5 ns
Operating free-air temperature –55 125 0 70 °C

†

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

SN54ALS137A SN74ALS137A

MIN TYP‡MAX MIN TYP‡MAX

V

IK

V

OH

OL

I

I

I

IH

I

IL

§

I

O

I

‡

All typical values are at VCC = 5 V, TA = 25°C.

§

The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.

CC

VCC = 4.5 V, II = –18 mA –1.5 –1.5 V
VCC = 4.5 V to 5.5 V, IOH = –0.4 mA VCC –2 VCC –2 V

=

CC

VCC = 5.5 V, VI = 7 V 0.1 0.1 mA
VCC = 5.5 V, VI = 2.7 V 20 20 µA
VCC = 5.5 V, VI = 0.4 V –0.1 –0.1 mA
VCC = 5.5 V, VO = 2.25 V –20 –112 –30 –112 mA
VCC = 5.5 V 5 11 5 11 mA

IOL = 4 mA 0.25 0.4 0.25 0.4
IOL = 8 mA 0.35 0.5

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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