SN74ALS645ADB

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS645ADB is an octal bus transceiver manufactured by Texas Instruments, belonging to the ALS logic series. It features eight independent bidirectional data channels with three-state outputs, facilitating efficient data transfer between buses. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports TTL input and output levels. Key electrical parameters include a propagation delay of 10 ns, a low-level output current of 24 mA, and a high-level output current of -15 mA. It is housed in a 20-pin SOIC package and functions reliably across an operating temperature range of 0°C to +70°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Provides eight independent bidirectional data channels for efficient bus interfacing
• Features three-state outputs to prevent bus contention during inactive states
• Supports TTL-compatible input and output voltage levels for system integration

Buffers, Drivers, Receivers, Transceivers Applications

• Bidirectional data bus drivers and receivers
• Memory-to-memory or memory-to-I/O transfers
• Bus-oriented architectures requiring isolation

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix 'ADB' against the official Texas Instruments datasheet to confirm the exact package type and tape-and-reel specifications. Ensure compatibility with existing PCB footprints and reflow profiles. Confirm RoHS compliance status and environmental certifications required for the target application before finalizing procurement orders.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when designing systems requiring high-speed octal data transfer with TTL level compatibility. The ALS series offers a balance of speed and power consumption suitable for general-purpose digital applications. Verify that the 20-pin SOIC package fits the mechanical constraints and that the 10 ns propagation delay meets the timing requirements of the target bus architecture.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SN74ALS family of bipolar logic devices, known for higher speed compared to standard LS series while maintaining lower power than original SSI/LSI standards. The SN74ALS645A variant specifically provides non-inverting octal bus transceiver functionality. It is designed for use in microprocessor-based systems where reliable bidirectional data flow is critical.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Compatible substitutes include SN74ALS640BNSR (inverting) and SN74ALS640BDWR. Verify pinout compatibility and inversion polarity differences before substitution.