SN74BCT640NS

Buffers, Drivers, Receivers, Transceivers Overview

The SN74BCT640NS is an octal bus transceiver utilizing state-of-the-art BiCMOS technology to substantially reduce standby current. It provides three-state outputs with undershoot-protection circuitry and features buffered control inputs to minimize DC loading effects. The device supports bidirectional data transmission between two buses, controlled by a direction input and an output-enable input. It operates within a supply voltage range of 4.5 V to 5.5 V and is characterized for operation from 0°C to 70°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• State-of-the-art BiCMOS design reduces standby current consumption
• Outputs include undershoot-protection circuitry
• Power-up high-impedance state ensures safe initialization
• Buffered control inputs reduce DC loading effects

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous communication between data buses
• Bidirectional data transmission in memory architectures
• System-level bus isolation and control

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix matches the required package type, as the NS suffix denotes a plastic small-outline package. Confirm that the temperature grade aligns with the application requirements, noting that this catalog version is rated for 0°C to 70°C. Ensure compatibility with the intended supply voltage and load conditions before finalizing procurement.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when low standby power and high drive capability are required for asynchronous bus systems. The BiCMOS process offers superior performance compared to standard CMOS while maintaining TTL-compatible input levels. Consider the package constraints and thermal characteristics suitable for the target PCB layout and operating environment.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the Texas Instruments SN74BCT series, which combines the speed of bipolar logic with the low power of CMOS. It serves as a standard solution for buffering and driving large capacitive loads on system buses. The octal configuration allows for efficient management of wide data paths in digital systems.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74BCT640DW (SOIC-20 package)

Buffers, Drivers, Receivers, Transceivers FAQ

What is the function of the OE input?

The output-enable (OE) input isolates the buses when asserted high, placing the outputs in a high-impedance state.

How does the DIR input control data flow?

The direction-control (DIR) input determines whether data transfers from the A bus to the B bus or vice versa.