Datasheet SN74ALS137AN, SN74ALS137AD, SN74ALS137ADR, SNJ54ALS137AJ, SNJ54ALS137AW Datasheet (Texas Instruments)
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
3
SN54ALS137A, SN74ALS137A, SN74AS137
(
)
(
)
(INPUT)
(OUTPUT)
A, B, C
Y
ns
G2
Y
ns
G1
Y
ns
LE
Y
ns
UNIT
3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
WITH ADDRESS LATCHES
SDAS203C – APRIL 1982 – REVISED JANUARY 1995
switching characteristics (see Figure 1)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
PARAMETER
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
†
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
PHL
FROM
INPUT
TO
OUTPUT
RL = 500 Ω
TA = MIN to MAX
SN54ALS137A SN74ALS137A
MIN MAX MIN MAX
5 25 5 20
6 25 6 20
4 15 3 12
5 18 4 15
5 21 4 17
5 19 4 15
7 27 6 22
7 25 7 20
,
†
UNIT
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
: SN74AS137 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A
recommended operating conditions
SN74AS137
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 V
High-level input voltage 2 V
Low-level input voltage 0.8 V
High-level output current –2 mA
Low-level output current 20 mA
Pulse duration, LE low 6.5 ns
Setup time at A, B, and C before LE↑ 4 ns
Hold time at A, B, and C after LE↑ 1 ns
Operating free-air temperature 0 70 °C
‡
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54ALS137A, SN74ALS137A, SN74AS137
PARAMETER
TEST CONDITIONS
UNIT
(
)
(
)
(INPUT)
(OUTPUT)
A, B, C
Y
ns
G2
Y
ns
G1
Y
ns
LE
Y
ns
3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
WITH ADDRESS LATCHES
SDAS203C – APRIL 1982 – REVISED JANUARY 1995
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN74AS137
MIN TYP†MAX
V
IK
V
OH
V
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
switching characteristics (see Figure 1)
PARAMETER
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
§
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
PHL
VCC = 4.5 V, II = –18 mA –1.2 V
VCC = 4.5 V to 5.5 V, IOH = –2 mA VCC–2 V
VCC = 4.5 V, IOL = 20 mA 0.35 0.5 V
VCC = 5.5 V, VI = 7 V 0.1 mA
VCC = 5.5 V, VI = 2.7 V 20 µA
VCC = 5.5 V, VI = 0.4 V –1 mA
VCC = 5.5 V, VO = 2.25 V –30 –112 mA
VCC = 5.5 V 15 24 mA
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
FROM
INPUT
TO
OUTPUT
RL = 500 Ω
TA = MIN to MAX
,
SN74AS137
MIN MAX
2 12.5
2 12.5
2 8
2 8.5
2 10
2 9
3 13.5
3 14
§
UNIT
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
5
SN54ALS137A, SN74ALS137A, SN74AS137
3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
WITH ADDRESS LATCHES
SDAS203C – APRIL 1982 – REVISED JANUARY 1995
PARAMETER MEASUREMENT INFORMATION
SERIES 54ALS/74ALS AND 54AS/74AS DEVICES
V
CC
From Output
Under Test
(see Note A)
C
L
Test
Point
R
L
From Output
Under Test
C
(see Note A)
L
R
L
Test
Point
From Output
Under Test
(see Note A)
7 V
RL = R1 = R2
S1
R1
C
L
Test
Point
R2
LOAD CIRCUIT FOR
BI-STATE
TOTEM-POLE OUTPUTS
Timing
Input
t
su
Data
Input
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
Output
Control
(low-level
enabling)
Waveform 1
S1 Closed
(see Note B)
Waveform 2
S1 Open
(see Note B)
t
PZL
t
PZH
ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS
VOLTAGE WAVEFORMS
1.3 V
t
PHZ
1.3 V
1.3 V
t
1.3 V1.3 V
1.3 V1.3 V
FOR OPEN-COLLECTOR OUTPUTS
h
t
PLZ
LOAD CIRCUIT
3.5 V
0.3 V
3.5 V
0.3 V
3.5 V
0.3 V
[
3.5 V
V
OL
0.3 V
V
OH
0.3 V
[
0 V
High-Level
Low-Level
Out-of-Phase
(see Note C)
Pulse
Pulse
Input
In-Phase
Output
Output
LOAD CIRCUIT
FOR 3-STATE OUTPUTS
1.3 V 1.3 V
t
w
1.3 V 1.3 V
VOLTAGE WAVEFORMS
PULSE DURATIONS
1.3 V 1.3 V
t
PLH
t
PHL
1.3 V 1.3 V
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
1.3 V1.3 V
t
PHL
t
PLH
3.5 V
0.3 V
3.5 V
0.3 V
3.5 V
0.3 V
V
V
V
V
OH
OL
OH
OL
NOTES: A. CL includes probe and jig capacitance.
B. W aveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. When measuring propagation delay items of 3-state outputs, switch S1 is open.
D. All input pulses have the following characteristics: PRR ≤ 1 MHz, tr = tf = 2 ns, duty cycle = 50%.
E. The outputs are measured one at a time with one transition per measurement.
Figure 1. Load Circuits and Voltage Waveforms
6
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