Document
SN54LS846 THRU SN54LS649 SN74LS646 THRU SN74LS649 OCTAL BUS TRANSCEIVERS AND REGISTERS
SDLS190A − DECEMBER 1982 − REVISED MAY 2004
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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.
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright 2004, Texas Instruments Incorporated 1
SN54LS646 THRU SN54LS649, SN74LS646 THRU SN74LS649 OCTAL BUS TRANSCEIVERS AND REGISTERS
SDLS190A − DECEMBER 1982 − REVISED MAY 2004
H or L H or L
X H or L
X H or L
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• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
SN54LS646 THRU SN54LS649, SN74LS646 THRU SN74LS649 OCTAL BUS TRANSCEIVERS AND REGISTERS
SDLS190A − DECEMBER 1982 − REVISED MAY 2004
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
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SN54LS646, SN54LS647, SN74LS646, SN74LS647 OCTAL BUS TRANSCEIVERS AND REGISTERS
SDLS190A − DECEMBER 1982 − REVISED MAY 2004
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• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
SN54LS648, SN54LS649, SN74LS648, SN74LS649 OCTAL BUS TRANSCEIVERS AND REGISTERS
SDLS190A − DECEMBER 1982 − REVISED MAY 2004
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
5
SN54LS646 THRU SN54LS649 SN74LS646 THRU SN74LS649 OCTAL BUS TRANSCEIVERS AND REGISTERS
SDLS190A − DECEMBER 1982 − REVISED MAY 2004
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• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
SN54LS646, SN54LS648, SN74LS646, SN74LS648 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3ĆSTATE OUTPUTS
SDLS190A − DECEMBER 1982 − REVISED MAY 2004
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
7
SN54LS646, SN54LS648, SN74LS646, SN74LS648 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3ĆSTATE OUTPUTS
SDLS190A − DECEMBER 1982 − REVISED MAY 2004
8
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
SN54LS647, SN54LS649, SN74LS647, SN74LS649 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH OPENĆCOLLECTOR OUTPUTS
SDLS190A − DECEMBER 1982 − REVISED MAY 2004
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
9
SN54LS647, SN54LS649, SN74LS647, SN74LS649 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH OPENĆCOLLECTOR OUTPUTS
SDLS190A − DECEMBER 1982 − REVISED MAY 2004
10
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status Package Type Package Pins Package Eco Plan
(1)
Drawing
Qty
(2)
SN74LS646DW
ACTIVE
SOIC
DW 24
25 RoHS & Green
Lead finish/ Ball material
(6)
NIPDAU
MSL Peak Temp Op Temp (°C)
(3)
Level-1-260C-UNLIM
0 to 70
Device Marking
(4/5)
LS646
(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) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based flame retardants must also meet the <=1000ppm threshold requirement.
(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device.
(6) Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to two lines if the finish value exceeds the .