SN74ALS245A-1DBR

Overview

The SN74ALS245A-1DBR is an octal bus transceiver from Texas Instruments' ALS logic family, housed in a 20-pin SSOP 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 10 ns. It provides a low-level output current of 24 mA and a high-level output current of -15 mA. Operating temperatures range from 0°C to +70°C.

Feature Summary

• Supports bidirectional data flow with automatic direction control via the DIRECTION pin
• Enables bridging between 3.3V and 5V buses
• Features three-state outputs for effective bus line driving

Applications

• Memory mapping control
• Clock drivers
• Bus-oriented communications

Procurement Notes

Verify the specific suffix 'DBR' corresponds to the SSOP-20 tape and reel packaging configuration. Confirm that the 'A-1' designation aligns with the required direction control functionality and electrical characteristics for your design. Ensure compatibility with the target operating temperature range and voltage specifications before finalizing procurement.

Selection Notes

Select this component when bidirectional data transfer is required between systems operating at different voltage levels, specifically 3.3V and 5V. The ALS series offers faster switching speeds compared to standard LS logic. Consider the SSOP package size constraints and the need for automatic direction control via the DIR pin when evaluating this part against other octal transceivers.

Part Context

This part belongs to the SN74ALS245A family of octal bus transceivers. It is designed for high-speed digital applications requiring reliable data transmission across multiple lines. The device integrates eight independent bi-directional channels, providing a compact solution for complex bus architectures in industrial and consumer electronics.

Replacement Considerations

SN74ALS245ADBR

FAQ

What is the function of the DIRECTION pin?

The DIRECTION pin controls the automatic direction of data flow through the transceiver, allowing seamless bidirectional communication.

Is this device suitable for 3.3V to 5V level shifting?

Yes, the SN74ALS245A-1DBR is specifically noted for its capability to bridge 3.3V and 5V buses effectively.