SN74LS642DW

Buffers, Drivers, Receivers, Transceivers Overview

The SN74LS642DW is an octal bus transceiver from the Texas Instruments SN74LS series, housed in a 20-pin SOIC package. It features open-collector outputs and operates within a supply voltage range of 4.75 V to 5.25 V. The device supports TTL input and output levels, with a propagation delay of 25 ns. It provides a low-level output current of 24 mA and a high-level output current of -15 mA. Designed for surface-mount installation, it functions across an operating temperature range of 0°C to +70°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal bus transceiver architecture providing eight independent data channels
• Open-collector output configuration suitable for wired-OR applications
• Inverting logic polarity for signal direction control

Buffers, Drivers, Receivers, Transceivers Applications

• Bidirectional data bus interfacing between microprocessors and memory modules
• I/O port expansion for digital control systems
• Signal buffering and level translation in TTL-compatible circuits

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify that the specific orderable part number matches the required package style and lead finish specifications. Confirm RoHS compliance status and moisture sensitivity level ratings prior to procurement. Ensure the selected variant aligns with the intended operating temperature range and packaging quantity requirements for the manufacturing process.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when open-collector outputs are necessary for bus sharing or wired-logic configurations. The LS logic family offers standard switching speeds compatible with general-purpose digital interfaces. Consider the 20-pin SOIC footprint for PCB layout constraints and verify that the 24 mA sink capability meets the load requirements of the connected circuitry.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the SN74LS64x family of octal bus transceivers. While other variants in the series utilize three-state outputs, the SN74LS642 specifically employs open-collector outputs. This distinction allows for different electrical characteristics compared to the non-inverting or three-state versions within the same logical grouping.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74LS642-1DW

Buffers, Drivers, Receivers, Transceivers FAQ

What distinguishes the SN74LS642 from the SN74LS640?

The SN74LS642 utilizes open-collector outputs, whereas the SN74LS640 features three-state outputs.

Is the SN74LS642 inverting or non-inverting?

The SN74LS642 is an inverting bus transceiver.