Details, datasheet, quote on part number: SN54ALS645A
CategorySemiconductors => Space & High Reliability => Logic Products => Buffers/Drivers/Transceivers => Transceivers
Part familySN54ALS645A Octal Bus Transceivers With 3-State Outputs
TitleBus Oriented Circuits
DescriptionOctal Bus Transceivers With 3-State Outputs 20-CDIP -55 to 125
CompanyTexas Instruments, Inc.
DatasheetDownload SN54ALS645A datasheet
Cross ref.Similar parts: SN74LS366AJD, SN74LS366AJDS, SN74LS366AJS, SN74LS366AN, SN74LS366AND, SN74LS366ANDS, SN74LS366ANS, SN74LS368AD, SN74LS368ADR2, SN74LS368AJD
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Technology FamilyALS
Package GroupCDIP,CFP
Schmitt TriggerNo
Operating Temperature Range(C)-55 to 125
  Mecanical Data
Pin nbPackage typeInd stdJEDEC codePackage qtyCarrierDevice markWidth (mm)Length (mm)Thick (mm)Pitch (mm)
20JCDIPR-GDIP-T1TUBESNJ54ALS645AJ 6.9224.24.572.54
Application notes
• Input and Output Characteristics of Digital Integrated Circuits
This report contains a comprehensive collection of the input and output characteristic curves of typical integrated circuits from various logic families. These curves go beyond the information given in data sheets by providing additional details regarding | Doc
• Advanced Schottky (ALS and AS) Logic Families
This document introduces the advanced Schottky family of clamped TTL integrated circuits (ICs). Detailed electrical characteristics of the 'AS and 'ALS devices with table formats are provided. Guidelines for designing high-performance digital systems using | Doc
• Live Insertion
Many applications require the ability to exchange modules in electronic systems without removing the supply voltage from the module (live insertion). For example an electronic telephone exchange must always remain operational even during module maintenance | Doc
• Bus-Interface Devices With Output-Damping Resistors Or Reduced-Drive Outputs (Rev. A)
The spectrum of bus-interface devices with damping resistors or balanced/light output drive currently offered by various logic vendors is confusing at best. Inconsistencies in naming conventions and methods used for implementation make it difficult to iden | Doc
• Designing With Logic (Rev. C)
Data sheets, which usually give information on device behavior only under recommended operating conditions, may only partially answer engineering questions that arise during the development of systems using logic devices. However, information is frequently | Doc


Features, Applications

Bidirectional Bus Transceivers in High-Density 20-Pin Packages True Logic 3-State Outputs Package Options Include Plastic Small-Outline (DW) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs


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 on the level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so that the buses are effectively isolated. The -1 version of the SN74ALS645A is identical to the standard version, except that the recommended maximum IOL is increased to 48 mA. There no -1 version of the SN54ALS645A. The SN54ALS645A and SN54AS645 are characterized for operation over the full military temperature range to 125C. The SN74ALS645A and SN74AS645 are characterized for operation from to 70C.

FUNCTION TABLE INPUTS L H DIR H X OPERATION B data to A bus A data to B bus Isolation

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.

This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

Supply voltage, VCC. 7 V Input voltage, VI: All inputs. 7 V I/O ports. 5.5 V Operating free-air temperature range, TA: to 70C Storage temperature range. to 150C

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.

SN54ALS645A MIN VCC VIH VIL IOH IOL Supply voltage High-level input voltage Low-level input voltage High-level output current Low level output current Low-level NOM 5 MAX 5.5 SN74ALS645A MIN NOM 5 MAX 5.5 UNIT mA C

TA Operating free-air temperature Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V

electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)

Outputs disabled All typical values are at VCC = 25C. Applies only to the -1 version and only if VCC is between 4.75 V and V For I/O ports, the parameters IIH and IIL include the off-state output current. The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.


# For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.


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0-C     D-L     M-R     S-Z