


SDAS300 − MARCH 1995
Copyright 1995, Texas Instruments Incorporated
1
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
Bidirectional Bus Transceivers in
High-Density 20-Pin Packages
Choice of True or Inverting Logic
Package Options Include Plastic
Small-Outline (DW) Packages and
Standard Plastic (N) 300-mil DIPs
DEVICE LOGIC
SN74ALS641A, SN74AS641 True
SN74ALS642A Inverting
description
These octal bus transceivers are designed for
asynchronous two-way communication between
data buses. These devices transmit data from the A bus to the B bus or from the B bus to the A bus, depending
upon the level at the direction-control (DIR) input. The output-enable (OE) input disables the device so that the
buses are effectively isolated.
The -1 versions of the SN74ALS641A and SN74ALS642A are identical to the standard versions, except that
the recommended maximum IOL is increased to 48 mA in the -1 versions.
The SN74ALS641A, SN74ALS642A, and SN74AS641 are characterized for operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS OPERATION
OE DIR SN74ALS641A
SN74AS641 SN74ALS642A
L L B data to A bus B data to A bus
LH A data to B bus A data to B bus
H X Isolation Isolation
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
DIR
A1
A2
A3
A4
A5
A6
A7
A8
GND
VCC
OE
B1
B2
B3
B4
B5
B6
B7
B8
DW OR N PACKAGE
(TOP VIEW)
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

SDAS300 − MARCH 1995
2POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
logic symbols
B2
17
B3
16
B4
15
A5 6
A6 7
A7 8
A8 9
A2 3
A3 4
A4 5
OE
A1 2
G3
19
3 EN2 [AB]
B5
14
B6
13
B7
12
B8
11
B1
18
3 EN1 [BA]
1
DIR
1
2
SN74ALS641A, SN74AS641
B2
17
B3
16
B4
15
A5 6
A6 7
A7 8
A8 9
A2 3
A3 4
A4 5
OE
A1 2
G3
19
3 EN2 [AB]
B5
14
B6
13
B7
12
B8
11
B1
18
3 EN1 [BA]
1
DIR
1
2
SN74ALS642A
These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.



SDAS300 − MARCH 1995
3
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
logic diagrams (positive logic)
SN74ALS641A, SN74AS641
A1 B1
19
1
18
2
OE
DIR
To Seven Other Transceivers
SN74ALS642A
A1 B1
19
1
18
2
OE
DIR
To Seven Other Transceivers
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, VI: All inputs and I/O ports 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, TA: SN74ALS641A, SN74ALS642A 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
SN74ALS641A
SN74ALS642A
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
VOH High-level output voltage 5.5 V
IOL
Low-level output current
24
mA
IOL Low-level output current 48mA
TAOperating free-air temperature 0 70 °C
Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V
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

SDAS300 − MARCH 1995
4POST 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
SN74ALS641A
SN74ALS642A
UNIT
PARAMETER
TEST CONDITIONS
MIN TYPMAX
UNIT
VIK VCC = 4.5 V, II = −18 mA 1.5 V
IOH VCC = 4.5 V, VOH = 5.5 V 0.1 mA
IOL = 12 mA 0.25 0.4
V
OL
V
CC
= 4.5 V IOL = 24 mA 0.35 0.5 V
VOL
VCC = 4.5 V
IOL = 48 mA0.35 0.5
V
IIControl inputs VCC = 5.5 V, VI = 7 V 0.1 mA
IIH
Control inputs
VCC = 5.5 V,
VI = 2.7 V
20
A
IIH A or B ports§VCC = 5.5 V, VI = 2.7 V 20 µA
IIL
Control inputs
VCC = 5.5 V,
VI = 0.4 V
0.1
mA
IIL A or B ports§VCC = 5.5 V, VI = 0.4 V 0.1 mA
VCC = 5.5 V
Outputs high 25 37
ICC
SN74ALS641A VCC = 5.5 V Outputs low 33 47
mA
I
CC
VCC = 5.5 V
Outputs high 8 15
mA
V
CC
= 5.5 V
Outputs low 18 28
All typical values are at VCC = 5 V, TA = 25°C.
Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V
§For I/O ports, the parameters IIH and IIL include the off-state output current.
switching characteristics (see Figure 1)
PARAMETER FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 680 ,
TA = MIN to MAXUNIT
PARAMETER
(INPUT)
(OUTPUT)
SN74ALS641A SN74ALS642A
UNIT
MIN MAX MIN MAX
tPLH
A or B
B or A
5 25 10 30
ns
tPHL A or B B or A 3 18 5 22 ns
tPLH
OE
A or B
8 30 10 30
ns
tPHL OE A or B 8 30 15 38 ns
tPLH
DIR
A or B
8 32 10 30
ns
tPHL
DIR
A or B
8 32 15 38
ns
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.



SDAS300 − MARCH 1995
5
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: All inputs and I/O ports 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, TA: SN74AS641 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
SN74AS641
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
VOH High-level output voltage 5.5 V
IOL Low-level output current 64 mA
TAOperating free-air temperature 0 70 °C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN74AS641
UNIT
PARAMETER
TEST CONDITIONS
MIN TYPMAX
UNIT
VIK VCC = 4.5 V, II = −18 mA 1.2 V
IOH VCC = 4.5 V, VOH = 5.5 V 0.1 mA
VOL VCC = 4.5 V, IOL = 64 mA 0.35 0.55 V
II
Control inputs
VCC = 5.5 V
VI = 7 V 0.1
mA
IIA or B ports VCC = 5.5 V VI = 5.5 V 0.1 mA
IIH
Control inputs
VCC = 5.5 V,
VI = 2.7 V
20
A
IIH A or B ports§VCC = 5.5 V, VI = 2.7 V 70 µA
IIL
Control inputs
VCC = 5.5 V,
VI = 0.4 V
0.5
mA
IIL A or B ports§VCC = 5.5 V, VI = 0.4 V 0.75 mA
ICC
VCC = 5.5 V
Outputs high 50 82
mA
I
CC
V
CC
= 5.5 V
Outputs low 84 136
mA
All typical values are at VCC = 5 V, TA = 25°C.
§For I/O ports, the parameters IIH and IIL include the off-state output current.



SDAS300 − MARCH 1995
6POST 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 = 680 ,
TA = MIN to MAXUNIT
PARAMETER
(INPUT)
(OUTPUT)
SN74AS641
UNIT
MIN MAX
tPLH
A or B
B or A
5 21
ns
tPHL A or B B or A 1 7.5 ns
tPLH
OE
A or B
5 21
ns
tPHL OE A or B 1 9 ns
tPLH
DIR
A or B
5 22
ns
tPHL
DIR
A or B
1 10
ns
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.



SDAS300 − MARCH 1995
7
POST 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 28-Aug-2010
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)
SN74ALS641A-1DW ACTIVE SOIC DW 20 25 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS641A-1DWE4 ACTIVE SOIC DW 20 25 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS641A-1DWG4 ACTIVE SOIC DW 20 25 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS641A-1DWR ACTIVE SOIC DW 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS641A-1DWRE4 ACTIVE SOIC DW 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS641A-1DWRG4 ACTIVE SOIC DW 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS641A-1N ACTIVE PDIP N 20 20 Pb-Free (RoHS) CU NIPDAU N / A for Pkg Type Purchase Samples
SN74ALS641A-1NE4 ACTIVE PDIP N 20 20 Pb-Free (RoHS) CU NIPDAU N / A for Pkg Type Purchase Samples
SN74ALS641A-1NSR ACTIVE SO NS 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS641A-1NSRE4 ACTIVE SO NS 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS641A-1NSRG4 ACTIVE SO NS 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS641ADW ACTIVE SOIC DW 20 25 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS641ADWE4 ACTIVE SOIC DW 20 25 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS641ADWG4 ACTIVE SOIC DW 20 25 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS641ADWR ACTIVE SOIC DW 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS641ADWRE4 ACTIVE SOIC DW 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS641ADWRG4 ACTIVE SOIC DW 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS641AN ACTIVE PDIP N 20 20 Pb-Free (RoHS) CU NIPDAU N / A for Pkg Type Purchase Samples
PACKAGE OPTION ADDENDUM
www.ti.com 28-Aug-2010
Addendum-Page 2
Orderable Device Status (1) Package Type Package
Drawing Pins Package Qty Eco Plan (2) Lead/
Ball Finish MSL Peak Temp (3) Samples
(Requires Login)
SN74ALS641ANE4 ACTIVE PDIP N 20 20 Pb-Free (RoHS) CU NIPDAU N / A for Pkg Type Purchase Samples
SN74ALS641ANSR ACTIVE SO NS 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS641ANSRE4 ACTIVE SO NS 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS641ANSRG4 ACTIVE SO NS 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS642A-1DW ACTIVE SOIC DW 20 25 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS642A-1DWE4 ACTIVE SOIC DW 20 25 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS642A-1DWG4 ACTIVE SOIC DW 20 25 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS642A-1N ACTIVE PDIP N 20 20 Pb-Free (RoHS) CU NIPDAU N / A for Pkg Type Purchase Samples
SN74ALS642A-1NE4 ACTIVE PDIP N 20 20 Pb-Free (RoHS) CU NIPDAU N / A for Pkg Type Purchase Samples
SN74ALS642A-1NSR ACTIVE SO NS 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS642A-1NSRE4 ACTIVE SO NS 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS642A-1NSRG4 ACTIVE SO NS 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS642ADW OBSOLETE SOIC DW 20 TBD Call TI Call TI Samples Not Available
SN74ALS642ADWR OBSOLETE SOIC DW 20 TBD Call TI Call TI Samples Not Available
SN74ALS642AN OBSOLETE PDIP N 20 TBD Call TI Call TI Samples Not Available
SN74AS641DW ACTIVE SOIC DW 20 25 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74AS641DWE4 ACTIVE SOIC DW 20 25 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74AS641DWG4 ACTIVE SOIC DW 20 25 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74AS641N ACTIVE PDIP N 20 20 Pb-Free (RoHS) CU NIPDAU N / A for Pkg Type Purchase Samples
SN74AS641NE4 ACTIVE PDIP N 20 20 Pb-Free (RoHS) CU NIPDAU N / A for Pkg Type Purchase Samples
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
PACKAGE OPTION ADDENDUM
www.ti.com 28-Aug-2010
Addendum-Page 3
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)
(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.
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
SN74ALS641A-1DWR SOIC DW 20 2000 330.0 24.4 10.8 13.0 2.7 12.0 24.0 Q1
SN74ALS641A-1NSR SO NS 20 2000 330.0 24.4 8.2 13.0 2.5 12.0 24.0 Q1
SN74ALS641ADWR SOIC DW 20 2000 330.0 24.4 10.8 13.0 2.7 12.0 24.0 Q1
SN74ALS641ANSR SO NS 20 2000 330.0 24.4 8.2 13.0 2.5 12.0 24.0 Q1
SN74ALS642A-1NSR SO NS 20 2000 330.0 24.4 8.2 13.0 2.5 12.0 24.0 Q1
PACKAGE MATERIALS INFORMATION
www.ti.com 14-Jul-2012
Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
SN74ALS641A-1DWR SOIC DW 20 2000 367.0 367.0 45.0
SN74ALS641A-1NSR SO NS 20 2000 367.0 367.0 45.0
SN74ALS641ADWR SOIC DW 20 2000 367.0 367.0 45.0
SN74ALS641ANSR SO NS 20 2000 367.0 367.0 45.0
SN74ALS642A-1NSR SO NS 20 2000 367.0 367.0 45.0
PACKAGE MATERIALS INFORMATION
www.ti.com 14-Jul-2012
Pack Materials-Page 2
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