SN74ALS640BDWR

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS640BDWR is an octal bus transceiver from the Texas Instruments 74ALS logic family, housed in a 20-pin SOIC package. It operates within a supply voltage range of 4.5 V to 5.5 V and supports TTL input and output levels. The device features three-state outputs with a low-level output current of 24 mA and a high-level output current of -15 mA. Propagation delay is specified at 11 ns, and it functions within a temperature range of 0°C to +70°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Provides bidirectional data transmission across eight channels with direction control capability.
• Features three-state outputs that isolate the bus when disabled.
• Designed for TTL-compatible input and output signal levels.

Buffers, Drivers, Receivers, Transceivers Applications

• Memory module address and data bus driving
• Clock drivers and buffer circuits
• Bidirectional bus architecture implementations

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix 'BDWR' corresponds to the SOIC-20 surface-mount package and reel packaging configuration. Confirm RoHS compliance status and ensure the ALS logic series meets the required propagation delay specifications for the target application timing constraints.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when high-speed performance is required alongside TTL compatibility. The ALS series offers faster switching speeds compared to standard LS logic while maintaining similar power consumption profiles suitable for dense digital systems requiring octal buffering.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SN74ALS640B series of octal bus transceivers manufactured by Texas Instruments. It is part of the broader 74ALS logic family, which bridges the performance gap between standard 74LS and advanced 74AS logic families, providing enhanced speed for digital interface applications.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74ALS640BNSR (SOIC-20 variant)

Buffers, Drivers, Receivers, Transceivers FAQ

What is the polarity of the SN74ALS640BDWR?

The device is an inverting bus transceiver, meaning the output signals are logically inverted relative to the inputs.

Does this component support CMOS input levels?

No, the SN74ALS640BDWR is specified for TTL input levels, not CMOS levels.