SN74LS640M

Buffers, Drivers, Receivers, Transceivers Overview

The SN74LS640M is an octal bus transceiver from the LS logic series, manufactured by onsemi. It features eight independent bidirectional data channels with inverted outputs and three-state capability. The device operates within a supply voltage range of 4.75 V to 5.25 V. It supports TTL input and output levels, providing a low-level output current of 24 mA and a high-level output current of -15 mA. The propagation delay is specified at 15 ns. It is housed in a 20-pin SOIC package and functions for asynchronous two-way communication between data buses.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Provides eight independent bidirectional data channels for asynchronous two-way communication
• Features three-state outputs to facilitate efficient bus line driving
• Supports TTL-compatible input and output voltage levels
• Delivers inverted output signals for specific logic interface requirements

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous two-way communication between data buses
• Bus-oriented memory and register implementations
• Control signal transmission in industrial systems

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify that the component is sourced as an onsemi product, as the part number prefix indicates Texas Instruments origin. Confirm the package type matches the required SOIC-20 footprint. Ensure the logic family corresponds to the LS series specifications. Check for RoHS compliance status if required by assembly standards. Validate the manufacturing date code against project timelines.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when designing systems requiring octal bidirectional data transfer with inverted logic. It is suitable for applications needing TTL level compatibility and three-state bus isolation. Consider the 15 ns propagation delay for timing constraints. Verify power supply stability within the 4.75 V to 5.25 V range. Evaluate thermal performance for the SOIC-20 package in the intended operating environment.

Buffers, Drivers, Receivers, Transceivers Part Context

This component belongs to the SN74LS640 family of octal bus transceivers. It is functionally equivalent to the Texas Instruments SN74LS640 but distributed under the onsemi brand. The device serves as a standard interface solution for connecting microprocessors to peripheral devices or memory arrays via parallel data buses.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Direct substitutes include the Texas Instruments SN74LS640N and SN74LS640NSR. Other compatible options are the SN74LS640DR and SN74LS640PW. Verify pinout and electrical characteristics match before substitution.