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Product Detailed Parameters
- Description：BUS TRANSCEIVER, ALS SERIES
- Series：*
- Mfr：Texas Instruments
- Package：Bulk
- Logic Type：-
- Number of Elements：-
- Number of Bits per Element：-
- Input Type：-
- Output Type：-
- Current - Output High, Low：-
- Voltage - Supply：-
- Operating Temperature：-
- Mounting Type：-
- Package / Case：-
- Supplier Device Package：-
- Grade：-
- Qualification：-
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Overview
The SN74ALS1245A-1DW is an octal bus transceiver from the Texas Instruments ALS logic family, housed in a 20-pin SOIC package. It features three-state outputs and operates within a supply voltage range of 4.5 V to 5.5 V. The device supports TTL input and output levels with a propagation delay of 13 ns. It provides a low-level output current of 16 mA and a high-level output current of -15 mA. Designed for through-hole or surface-mount applications, it functions as a non-inverting bus transceiver suitable for bidirectional data transmission.
Feature Summary
- Octal bus transceiver architecture providing eight independent bidirectional channels
- Three-state outputs enabling direct connection to system buses without additional drivers
- TTL-compatible input and output voltage levels ensuring interoperability with standard logic families
Applications
- Bidirectional data transmission on microprocessor-based systems
- Memory buffer applications requiring high-speed data transfer
- I/O port expansion in industrial control environments
Procurement Notes
Verify the specific suffix '1DW' against the manufacturer's official datasheet to confirm the exact package type and temperature rating. Ensure compatibility with existing PCB footprints for the SOIC-20 configuration. Cross-reference electrical specifications such as propagation delay and output drive strength with system requirements before finalizing procurement decisions.
Selection Notes
Select this component when an octal bus transceiver with three-state outputs is required for bidirectional data flow. The ALS series offers a balance of speed and power consumption compared to standard TTL. Consider the SOIC-20 package if surface-mount technology is preferred over DIP formats. Verify that the 4.5 V to 5.5 V operating range aligns with the target system's power supply rails.
Part Context
This part belongs to the SN74ALS1245A series of octal bus transceivers. It is functionally similar to other devices in the ALS family but distinguished by its specific pinout and packaging. The '1DW' designation typically indicates a specific tape-and-reel or tube packaging option for the SOIC-20 variant, differing from the 'AN' DIP version.
Replacement Considerations
SN74ALS645A-1N: Octal bus transceiver with similar functionality but in a PDIP-20 package.
