SN54LS640 THRU SN54LS642, SN54LS644, SN54LS645
SN74LS640 THRU SN74LS642, SN74LS644, SN74LS645
OCTAL BUS TRANSCEIVRS
SDLS189 – APRIL 1979 – REVISED MARCH 1988
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Copyright 1988, Texas Instruments Incorporated
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.
SN54LS640 THRU SN54LS642, SN54LS644, SN54LS645
SN74LS640 THRU SN74LS642, SN74LS644, SN74LS645
OCTAL BUS TRANSCEIVRS
SDLS189 – APRIL 1979 – REVISED MARCH 1988
2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54LS640 THRU SN54LS642, SN54LS644, SN54LS645
SN74LS640 THRU SN74LS642, SN74LS644, SN74LS645
OCTAL BUS TRANSCEIVRS
SDLS189 – APRIL 1979 – REVISED MARCH 1988
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54LS640, SN54LS645
SN74LS640, SN74LS645
OCTAL BUS TRANSCEIVRS WITH 3-STATE OUTPUTS
SDLS189 – APRIL 1979 – REVISED MARCH 1988
4POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54LS640, SN54LS645
SN74LS640, SN74LS645
OCTAL BUS TRANSCEIVRS WITH 3-STATE OUTPUTS
SDLS189 – APRIL 1979 – REVISED MARCH 1988
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54LS640, SN54LS645
SN74LS640, SN74LS645
OCTAL BUS TRANSCEIVRS WITH 3-STATE OUTPUTS
SDLS189 – APRIL 1979 – REVISED MARCH 1988
6POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54LS641, SN54LS642, SN54LS644
SN74LS641, SN74LS642, SN74LS644
OCTAL BUS TRANSCEIVRS WITH OPEN-COLLECTOR OUTPUTS
SDLS189 – APRIL 1979 – REVISED MARCH 1988
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54LS641, SN54LS642, SN54LS644
SN74LS641, SN74LS642, SN74LS644
OCTAL BUS TRANSCEIVRS WITH OPEN-COLLECTOR OUTPUTS
SDLS189 – APRIL 1979 – REVISED MARCH 1988
8POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PACKAGING INFORMATION
Orderable Device Status (1) Package
Type Package
Drawing Pins Package
Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
5962-8416101VRA ACTIVE CDIP J 20 1 TBD A42 N / A for Pkg Type
5962-8416101VSA ACTIVE CFP W 20 1 TBD Call TI N / A for Pkg Type
84161012A ACTIVE LCCC FK 20 1 TBD POST-PLATE N / A for Pkg Type
8416101RA ACTIVE CDIP J 20 1 TBD A42 N / A for Pkg Type
8416101SA ACTIVE CFP W 20 1 TBD Call TI N / A for Pkg Type
SN54LS640J ACTIVE CDIP J 20 1 TBD A42 N / A for Pkg Type
SN54LS645J ACTIVE CDIP J 20 1 TBD A42 N / A for Pkg Type
SN74LS640-1DW ACTIVE SOIC DW 20 25 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS640-1DWE4 ACTIVE SOIC DW 20 25 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS640-1DWG4 ACTIVE SOIC DW 20 25 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS640-1DWR OBSOLETE SOIC DW 20 TBD Call TI Call TI
SN74LS640-1N ACTIVE PDIP N 20 20 Pb-Free
(RoHS) CU NIPDAU N / A for Pkg Type
SN74LS640-1NE4 ACTIVE PDIP N 20 20 Pb-Free
(RoHS) CU NIPDAU N / A for Pkg Type
SN74LS640-1NSR ACTIVE SO NS 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS640-1NSRE4 ACTIVE SO NS 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS640-1NSRG4 ACTIVE SO NS 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS640DW ACTIVE SOIC DW 20 25 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS640DWE4 ACTIVE SOIC DW 20 25 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS640DWG4 ACTIVE SOIC DW 20 25 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS640DWR ACTIVE SOIC DW 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS640DWRE4 ACTIVE SOIC DW 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS640DWRG4 ACTIVE SOIC DW 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS640N ACTIVE PDIP N 20 20 Pb-Free
(RoHS) CU NIPDAU N / A for Pkg Type
SN74LS640N3 OBSOLETE PDIP N 20 TBD Call TI Call TI
SN74LS640NE4 ACTIVE PDIP N 20 20 Pb-Free
(RoHS) CU NIPDAU N / A for Pkg Type
SN74LS640NSR ACTIVE SO NS 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS640NSRE4 ACTIVE SO NS 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS640NSRG4 ACTIVE SO NS 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS641-1DW ACTIVE SOIC DW 20 25 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM
PACKAGE OPTION ADDENDUM
www.ti.com 9-Jan-2010
Addendum-Page 1
Orderable Device Status (1) Package
Type Package
Drawing Pins Package
Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
no Sb/Br)
SN74LS641-1DWE4 ACTIVE SOIC DW 20 25 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS641-1DWG4 ACTIVE SOIC DW 20 25 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS641-1DWR ACTIVE SOIC DW 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS641-1DWRE4 ACTIVE SOIC DW 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS641-1DWRG4 ACTIVE SOIC DW 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS641-1N ACTIVE PDIP N 20 20 Pb-Free
(RoHS) CU NIPDAU N / A for Pkg Type
SN74LS641-1N3 OBSOLETE PDIP N 20 TBD Call TI Call TI
SN74LS641-1NE4 ACTIVE PDIP N 20 20 Pb-Free
(RoHS) CU NIPDAU N / A for Pkg Type
SN74LS641DW ACTIVE SOIC DW 20 25 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS641DWE4 ACTIVE SOIC DW 20 25 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS641DWG4 ACTIVE SOIC DW 20 25 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS641DWR ACTIVE SOIC DW 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS641DWRE4 ACTIVE SOIC DW 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS641DWRG4 ACTIVE SOIC DW 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS641N ACTIVE PDIP N 20 20 Pb-Free
(RoHS) CU NIPDAU N / A for Pkg Type
SN74LS641N3 OBSOLETE PDIP N 20 TBD Call TI Call TI
SN74LS641NE4 ACTIVE PDIP N 20 20 Pb-Free
(RoHS) CU NIPDAU N / A for Pkg Type
SN74LS641NSR ACTIVE SO NS 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS641NSRE4 ACTIVE SO NS 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS641NSRG4 ACTIVE SO NS 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS642-1DW ACTIVE SOIC DW 20 25 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS642-1DWE4 ACTIVE SOIC DW 20 25 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS642-1DWG4 ACTIVE SOIC DW 20 25 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS642-1N ACTIVE PDIP N 20 20 Pb-Free
(RoHS) CU NIPDAU N / A for Pkg Type
SN74LS642-1NE4 ACTIVE PDIP N 20 20 Pb-Free
(RoHS) CU NIPDAU N / A for Pkg Type
SN74LS642DW ACTIVE SOIC DW 20 25 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
PACKAGE OPTION ADDENDUM
www.ti.com 9-Jan-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)
SN74LS642DWE4 ACTIVE SOIC DW 20 25 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS642DWG4 ACTIVE SOIC DW 20 25 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS642N ACTIVE PDIP N 20 20 Pb-Free
(RoHS) CU NIPDAU N / A for Pkg Type
SN74LS642NE4 ACTIVE PDIP N 20 20 Pb-Free
(RoHS) CU NIPDAU N / A for Pkg Type
SN74LS642NSR ACTIVE SO NS 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS642NSRE4 ACTIVE SO NS 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS642NSRG4 ACTIVE SO NS 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS644-1N OBSOLETE PDIP N 20 TBD Call TI Call TI
SN74LS644N OBSOLETE PDIP N 20 TBD Call TI Call TI
SN74LS645-1DW ACTIVE SOIC DW 20 25 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS645-1DWE4 ACTIVE SOIC DW 20 25 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS645-1DWG4 ACTIVE SOIC DW 20 25 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS645-1DWR ACTIVE SOIC DW 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS645-1DWRE4 ACTIVE SOIC DW 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS645-1DWRG4 ACTIVE SOIC DW 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS645-1N ACTIVE PDIP N 20 20 Pb-Free
(RoHS) CU NIPDAU N / A for Pkg Type
SN74LS645-1N3 OBSOLETE PDIP N 20 TBD Call TI Call TI
SN74LS645-1NE4 ACTIVE PDIP N 20 20 Pb-Free
(RoHS) CU NIPDAU N / A for Pkg Type
SN74LS645-1NSR ACTIVE SO NS 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS645-1NSRE4 ACTIVE SO NS 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS645-1NSRG4 ACTIVE SO NS 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS645DW ACTIVE SOIC DW 20 25 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS645DWE4 ACTIVE SOIC DW 20 25 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS645DWG4 ACTIVE SOIC DW 20 25 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS645DWR OBSOLETE SOIC DW 20 TBD Call TI Call TI
SN74LS645N ACTIVE PDIP N 20 20 Pb-Free
(RoHS) CU NIPDAU N / A for Pkg Type
SN74LS645N3 OBSOLETE PDIP N 20 TBD Call TI Call TI
SN74LS645NE4 ACTIVE PDIP N 20 20 Pb-Free
(RoHS) CU NIPDAU N / A for Pkg Type
PACKAGE OPTION ADDENDUM
www.ti.com 9-Jan-2010
Addendum-Page 3
Orderable Device Status (1) Package
Type Package
Drawing Pins Package
Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
SN74LS645NSR ACTIVE SO NS 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS645NSRE4 ACTIVE SO NS 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SN74LS645NSRG4 ACTIVE SO NS 20 2000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
SNJ54LS640FK ACTIVE LCCC FK 20 1 TBD POST-PLATE N / A for Pkg Type
SNJ54LS640J ACTIVE CDIP J 20 1 TBD A42 N / A for Pkg Type
SNJ54LS640W ACTIVE CFP W 20 1 TBD Call TI N / A for Pkg Type
SNJ54LS645FK ACTIVE LCCC FK 20 1 TBD POST-PLATE N / A for Pkg Type
SNJ54LS645J ACTIVE CDIP J 20 1 TBD A42 N / A for Pkg Type
SNJ54LS645W OBSOLETE CFP W 20 TBD Call TI Call TI
(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)
(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.
PACKAGE OPTION ADDENDUM
www.ti.com 9-Jan-2010
Addendum-Page 4
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
SN74LS640-1NSR SO NS 20 2000 330.0 24.4 8.2 13.0 2.5 12.0 24.0 Q1
SN74LS640DWR SOIC DW 20 2000 330.0 24.4 10.8 13.0 2.7 12.0 24.0 Q1
SN74LS640NSR SO NS 20 2000 330.0 24.4 8.2 13.0 2.5 12.0 24.0 Q1
SN74LS641-1DWR SOIC DW 20 2000 330.0 24.4 10.8 13.0 2.7 12.0 24.0 Q1
SN74LS641DWR SOIC DW 20 2000 330.0 24.4 10.8 13.0 2.7 12.0 24.0 Q1
SN74LS641NSR SO NS 20 2000 330.0 24.4 8.2 13.0 2.5 12.0 24.0 Q1
SN74LS642NSR SO NS 20 2000 330.0 24.4 8.2 13.0 2.5 12.0 24.0 Q1
SN74LS645-1DWR SOIC DW 20 2000 330.0 24.4 10.8 13.0 2.7 12.0 24.0 Q1
SN74LS645-1NSR SO NS 20 2000 330.0 24.4 8.2 13.0 2.5 12.0 24.0 Q1
SN74LS645NSR 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 9-Jan-2010
Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
SN74LS640-1NSR SO NS 20 2000 346.0 346.0 41.0
SN74LS640DWR SOIC DW 20 2000 346.0 346.0 41.0
SN74LS640NSR SO NS 20 2000 346.0 346.0 41.0
SN74LS641-1DWR SOIC DW 20 2000 346.0 346.0 41.0
SN74LS641DWR SOIC DW 20 2000 346.0 346.0 41.0
SN74LS641NSR SO NS 20 2000 346.0 346.0 41.0
SN74LS642NSR SO NS 20 2000 346.0 346.0 41.0
SN74LS645-1DWR SOIC DW 20 2000 346.0 346.0 41.0
SN74LS645-1NSR SO NS 20 2000 346.0 346.0 41.0
SN74LS645NSR SO NS 20 2000 346.0 346.0 41.0
PACKAGE MATERIALS INFORMATION
www.ti.com 9-Jan-2010
Pack Materials-Page 2
MECHANICAL DATA
MLCC006B – OCTOBER 1996
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
FK (S-CQCC-N**) LEADLESS CERAMIC CHIP CARRIER
4040140/D 10/96
28 TERMINAL SHOWN
B
0.358
(9,09)
MAX
(11,63)
0.560
(14,22)
0.560
0.458
0.858
(21,8)
1.063
(27,0)
(14,22)
A
NO. OF
MINMAX
0.358
0.660
0.761
0.458
0.342
(8,69)
MIN
(11,23)
(16,26)
0.640
0.739
0.442
(9,09)
(11,63)
(16,76)
0.962
1.165
(23,83)
0.938
(28,99)
1.141
(24,43)
(29,59)
(19,32)(18,78)
**
20
28
52
44
68
84
0.020 (0,51)
TERMINALS
0.080 (2,03)
0.064 (1,63)
(7,80)
0.307
(10,31)
0.406
(12,58)
0.495
(12,58)
0.495
(21,6)
0.850
(26,6)
1.047
0.045 (1,14)
0.045 (1,14)
0.035 (0,89)
0.035 (0,89)
0.010 (0,25)
12
1314151618 17
11
10
8
9
7
5
432
0.020 (0,51)
0.010 (0,25)
6
12826 27
19
21
B SQ
A SQ 22
23
24
25
20
0.055 (1,40)
0.045 (1,14)
0.028 (0,71)
0.022 (0,54)
0.050 (1,27)
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. This package can be hermetically sealed with a metal lid.
D. The terminals are gold plated.
E. Falls within JEDEC MS-004
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