SDAS203C − APRIL 1982 − REVISED JANUARY 1995
Copyright 1995, Texas Instruments Incorporated
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
•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) input is low,
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) control the
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.
FUNCTION TABLE
INPUTS
OUTPUTS
ENABLE SELECT
OUTPUTS
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
XLXXXXHHHHHHHH
L H L L L L L H H H H H H H
LHLLLHHLHHHHHH
LHLLHLHHLHHHHH
LHLLHHHHHLHHHH
L H L H L L H H H H L H H H
LHLHLHHHHHHLHH
LHLHHLHHHHHHLH
LHLHHHHHHHHHHL
H H L X X X Outputs corresponding to stored address = L; all others = H
SN54ALS137A ...J PACKAGE
SN74ALS137A, SN74AS137 ...D OR N PACKAGE
(TOP VIEW)
3 2 1 20 19
910111213
4
5
6
7
8
18
17
16
15
14
Y1
Y2
NC
Y3
Y4
C
LE
NC
G2
G1
SN54ALS137A . . . FK PACKAGE
(TOP VIEW)
B
A
NC
Y6
Y5 Y0
Y7
GND
NC
NC − No internal connection
VCC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
A
B
C
LE
G2
G1
Y7
GND
VCC
Y0
Y1
Y2
Y3
Y4
Y5
Y6
!"#$ % &'!!($ #% )'*+&#$ ,#$(-
!,'&$% &!" $ %)(&&#$% )(! $.( $(!"% (/#% %$!'"($%
%$#,#!, 0#!!#$1- !,'&$ )!&(%%2 ,(% $ (&(%%#!+1 &+',(
$(%$2 #++ )#!#"($(!%-
SDAS203C − APRIL 1982 − REVISED JANUAR Y 1995
2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
logic symbols (alternatives)†
X/Y
1
A2
B3
C
C8
4
5
6
G1
Y0
15
0
&
EN
Y1
14
1
Y2
13
2
Y3
12
3
Y4
11
4
Y5
10
5
Y6
9
6
Y7
7
7
G7
0
LE
G2
8D 1
2
4
DMUX
1
A2
B3
C
C8
4
5
6
G1
Y0
15
0
&
Y1
14
1
Y2
13
2
Y3
12
3
Y4
11
4
Y5
10
5
Y6
9
6
Y7
7
7
LE
G2
8D 0
2
†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.
logic diagram (positive logic)
G1
G2
LE
C
B
A
6
5
4
3
2
1
Output
Enables
Latch
Enable
Select
Inputs
Data
Outputs
Y7
Y6
Y5
Y4
Y3
Y2
Y1
Y0
10
11
12
13
14
7
9
15
Pin numbers shown are for the D, J, and N packages.
SDAS203C − APRIL 1982 − REVISED JANUARY 1995
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage, VCC 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, VI 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, TA: SN54ALS137A −55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74ALS137A 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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.
recommended operating conditions
SN54ALS137A SN74ALS137A
UNIT
MIN NOM MAX MIN NOM MAX
UNIT
VCC Supply voltage 4.5 5 5.5 4.5 5 5.5 V
VIH High-level input voltage 2 2 V
VIL Low-level input voltage 0.7 0.8 V
IOH High-level output current −0.4 −0.4 mA
IOL Low-level output current 4 8 mA
twPulse duration, LE low 15 10 ns
tsu Setup time at A, B, and C before LE↑15 10 ns
thHold time at A, B, and C after LE↑5 5 ns
TAOperating free-air temperature −55 125 0 70 °C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54ALS137A SN74ALS137A
UNIT
PARAMETER
TEST CONDITIONS
MIN TYP‡MAX MIN TYP‡MAX
UNIT
VIK VCC = 4.5 V, II = −18 mA −1.5 −1.5 V
VOH VCC = 4.5 V to 5.5 V, IOH = −0.4 mA VCC −2 VCC −2 V
VOL
VCC = 4.5 V
IOL = 4 mA 0.25 0.4 0.25 0.4
V
VOL VCC = 4.5 V IOL = 8 mA 0.35 0.5 V
IIVCC = 5.5 V, VI = 7 V 0.1 0.1 mA
IIH VCC = 5.5 V, VI = 2.7 V 20 20 µA
IIL VCC = 5.5 V, VI = 0.4 V −0.1 −0.1 mA
IO§VCC = 5.5 V, VO = 2.25 V −20 −112 −30 −112 mA
ICC VCC = 5.5 V 511 511 mA
‡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.
SDAS203C − APRIL 1982 − REVISED JANUAR Y 1995
4POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
switching characteristics (see Figure 1)
PARAMETER FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500 Ω,
TA = MIN to MAX†UNIT
PARAMETER
(INPUT)
(OUTPUT)
SN54ALS137A SN74ALS137A
UNIT
MIN MAX MIN MAX
tPLH
A, B, C
Y
5 25 5 20
ns
tPHL A, B, C Y6 25 6 20 ns
tPLH
G2
Y
4 15 3 12
ns
tPHL G2 Y5 18 4 15 ns
tPLH
G1
Y
5 21 4 17
ns
tPHL G1 Y 5 19 4 15 ns
tPLH
LE
Y
7 27 6 22
ns
tPHL
LE
Y
7 25 7 20
ns
†For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)‡
Supply voltage, VCC 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, VI 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, TA: SN74AS137 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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.
recommended operating conditions
SN74AS137
UNIT
MIN NOM MAX
UNIT
VCC Supply voltage 4.5 5 5.5 V
VIH High-level input voltage 2 V
VIL Low-level input voltage 0.8 V
IOH High-level output current −2 mA
IOL Low-level output current 20 mA
twPulse duration, LE low 6.5 ns
tsu Setup time at A, B, and C before LE↑4 ns
thHold time at A, B, and C after LE↑1 ns
TAOperating free-air temperature 0 70 °C
SDAS203C − APRIL 1982 − REVISED JANUARY 1995
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN74AS137
UNIT
PARAMETER
TEST CONDITIONS
MIN TYP†MAX
UNIT
VIK VCC = 4.5 V, II = −18 mA −1.2 V
VOH VCC = 4.5 V to 5.5 V, IOH = −2 mA VCC−2 V
VOL VCC = 4.5 V, IOL = 20 mA 0.35 0.5 V
IIVCC = 5.5 V, VI = 7 V 0.1 mA
IIH VCC = 5.5 V, VI = 2.7 V 20 µA
IIL VCC = 5.5 V, VI = 0.4 V −1 mA
IO‡VCC = 5.5 V, VO = 2.25 V −30 −112 mA
ICC VCC = 5.5 V 15 24 mA
†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.
switching characteristics (see Figure 1)
PARAMETER FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500 Ω,
TA = MIN to MAX§UNIT
PARAMETER
(INPUT)
(OUTPUT)
SN74AS137
UNIT
MIN MAX
tPLH
A, B, C
Y
2 12.5
ns
tPHL A, B, C Y2 12.5 ns
tPLH
G2
Y
2 8
ns
tPHL G2 Y2 8.5 ns
tPLH
G1
Y
2 10
ns
tPHL G1 Y 2 9 ns
tPLH
LE
Y
3 13.5
ns
tPHL
LE
Y
3 14
ns
§For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
SDAS203C − APRIL 1982 − REVISED JANUAR Y 1995
6POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
PARAMETER MEASUREMENT INFORMATION
SERIES 54ALS/74ALS AND 54AS/74AS DEVICES
tPHZ
tPLZ
tPHL tPLH
0.3 V
tPZL
tPZH
tPLH tPHL
LOAD CIRCUIT
FOR 3-STATE OUTPUTS
From Output
Under Test Test
Point
R1
S1
CL
(see Note A)
7 V
1.3 V
1.3 V1.3 V
3.5 V
3.5 V
0.3 V
0.3 V
th
tsu
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
Timing
Input
Data
Input
1.3 V 1.3 V 3.5 V
3.5 V
0.3 V
0.3 V
High-Level
Pulse
Low-Level
Pulse
tw
VOLTAGE WAVEFORMS
PULSE DURATIONS
Input
Out-of-Phase
Output
(see Note C)
1.3 V 1.3 V
1.3 V1.3 V
1.3 V 1.3 V
1.3 V1.3 V
1.3 V
1.3 V
3.5 V
3.5 V
0.3 V
0.3 V
VOL
VOH
VOH
VOL
Output
Control
(low-level
enabling)
Waveform 1
S1 Closed
(see Note B)
Waveform 2
S1 Open
(see Note B) [0 V
VOH
VOL
[3.5 V
In-Phase
Output
0.3 V
1.3 V 1.3 V
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS
R2
VCC
RL
Test
Point
From Output
Under Test
CL
(see Note A)
LOAD CIRCUIT
FOR OPEN-COLLECTOR OUTPUTS
LOAD CIRCUIT FOR
BI-STATE
TOTEM-POLE OUTPUTS
From Output
Under Test Test
Point
CL
(see Note A) RL
RL = R1 = R2
NOTES: A. CL includes probe and jig capacitance.
B. Waveform 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
PACKAGE OPTION ADDENDUM
www.ti.com 5-Sep-2011
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status (1) Package Type Package
Drawing Pins Package Qty Eco Plan (2) Lead/
Ball Finish MSL Peak Temp (3) Samples
(Requires Login)
5962-9066501M2A ACTIVE LCCC FK 20 1 TBD Call TI Call TI
5962-9066501MEA ACTIVE CDIP J 16 1 TBD Call TI Call TI
5962-9066501MFA ACTIVE CFP W 16 1 TBD Call TI Call TI
SN74ALS137AD ACTIVE SOIC D 16 40 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74ALS137ADE4 ACTIVE SOIC D 16 40 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74ALS137ADG4 ACTIVE SOIC D 16 40 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74ALS137AN ACTIVE PDIP N 16 25 Pb-Free (RoHS) CU NIPDAU N / A for Pkg Type
SN74ALS137ANE4 ACTIVE PDIP N 16 25 Pb-Free (RoHS) CU NIPDAU N / A for Pkg Type
SN74AS137D OBSOLETE SOIC D 16 TBD Call TI Call TI
SN74AS137DR OBSOLETE SOIC D 16 TBD Call TI Call TI
SN74AS137N OBSOLETE PDIP N 16 TBD Call TI Call TI
SNJ54ALS137AFK ACTIVE LCCC FK 20 1 TBD POST-PLATE N / A for Pkg Type
SNJ54ALS137AJ ACTIVE CDIP J 16 1 TBD A42 N / A for Pkg Type
SNJ54ALS137AW ACTIVE CFP W 16 1 TBD A42 N / A for Pkg Type
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
PACKAGE OPTION ADDENDUM
www.ti.com 5-Sep-2011
Addendum-Page 2
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
OTHER QUALIFIED VERSIONS OF SN54ALS137A, SN74ALS137A :
•Catalog: SN74ALS137A
•Military: SN54ALS137A
NOTE: Qualified Version Definitions:
•Catalog - TI's standard catalog product
•Military - QML certified for Military and Defense Applications
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