Details, datasheet, quote on part number: SN74ALS243A
CategoryLogic => Bus Interface => Bus Oriented Circuits
TitleBus Oriented Circuits
DescriptionQuad Bus Transceivers With 3-state Outputs
CompanyTexas Instruments, Inc.
DatasheetDownload SN74ALS243A datasheet
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Features, Applications

Two-Way Asynchronous Communication Between Data Buses pnp Inputs Reduce dc Loading Package Options Include Plastic Small-Outline (D) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs


These quadruple bus transceivers are designed for asynchronous two-way communication between data buses. The control-function implementation allows for maximum flexibility in timing. These devices allow data transmission from the A bus to the B bus or from the B bus to the A bus depending upon the logic levels at the output-enable (OEBA and OEAB) inputs. The output-enable inputs can be used to disable the device so that the buses are effectively isolated. The dual-enable configuration gives the quadruple bus transceivers the capability to store data by simultaneously enabling OEBA and OEAB. Each output reinforces its input in this transceiver configuration. When both control inputs are enabled and all other data sources to the two sets of bus lines are at high impedance, both sets of bus lines (eight in all) retain their states. The 4-bit codes appearing on the two sets of buses are identical.

The SN54ALS243A is characterized for operation over the full military temperature range to 125C. The SN74ALS243A is characterized for operation from to 70C.

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. Pin numbers shown are for the D, J, and N packages.

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.

SN54ALS243A MIN VCC VIH VIL IOH IOL TA Supply voltage High-level input voltage Low-level input voltage High-level output current Low-level output current Operating free-air temperature NOM 5 MAX 5.5 SN74ALS243A MIN NOM 5 MAX 5.5 UNIT mA C

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

VOL II IIH IIL IO ICC Control inputs or B ports Control inputs or B ports Control inputs or B ports

All typical values are at VCC = 25C. 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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