SN74LS640DB

Buffers, Drivers, Receivers, Transceivers Overview

The SN74LS640DB is an octal bus transceiver from the Texas Instruments 74LS logic family. It features three-state outputs and operates within a supply voltage range of 4.75 V to 5.25 V. The device provides a propagation delay of 15 ns, with low-level output current capability of 24 mA and high-level output current of -15 mA. Designed for surface-mount applications, it utilizes a 20-pin SOIC package and supports TTL input and output levels across an operating temperature range of 0°C to +70°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal configuration providing eight bidirectional data channels in a single integrated circuit
• Three-state outputs enable direct connection to system buses without additional drivers
• TTL-compatible input and output voltage levels ensure interoperability with standard logic systems

Buffers, Drivers, Receivers, Transceivers Applications

• High-speed data acquisition systems requiring reliable signal transfer
• Memory mapping circuits for address and data bus management
• Control logic interfaces in industrial automation equipment

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify that the specific order matches the SN74LS640DB designation, as suffixes indicate distinct packaging or environmental compliance variations. Confirm the required package type aligns with design constraints. Ensure the selected variant meets the necessary operational temperature and electrical specifications for the intended application environment before finalizing procurement.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when an octal transceiver with TTL compatibility and moderate speed is required. The LS series offers a balance between power consumption and performance suitable for general-purpose digital logic. Consider the SOIC package dimensions for PCB layout and verify that the drive current capabilities meet the load requirements of the connected bus lines.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the Texas Instruments 74LS640 family of octal bus transceivers. It shares functional similarities with other variants such as the SN74ALS640BDWR and SN74LS640NSR, differing primarily in logic family characteristics, package style, and manufacturing revisions. The SN74LS640DB specifically denotes the small-outline integrated circuit package version.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74LS640DWE4