SN74LS642N

Buffers, Drivers, Receivers, Transceivers Overview

The SN74LS642N is an octal bus transceiver from the Texas Instruments LS logic series, housed in a 20-pin PDIP package. It features open-collector outputs and operates with TTL input and output levels. The device supports bidirectional data transfer controlled by a direction control pin. Electrical specifications include a minimum operating voltage of 4.75 V and a maximum of 5.25 V. Propagation delay is specified at 25 ns under a 5 V supply with a 45 pF load. The unit functions within a temperature range of 0°C to +70°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal bus transceiver architecture providing eight independent channels for bidirectional data transfer
• Open-collector output configuration suitable for wired-OR applications and bus line driving
• Direction control functionality enabling flexible data flow management between ports

Buffers, Drivers, Receivers, Transceivers Applications

• Bidirectional data bus buffering and routing in digital systems
• Memory address decoding and data register interfacing
• General-purpose I/O expansion and port isolation

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify that the specific orderable part number matches the required package type and lead finish. Confirm RoHS compliance status and moisture sensitivity level ratings against project requirements. Ensure the selected variant aligns with the intended operating temperature range and electrical interface standards before finalizing procurement.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when an octal transceiver with open-collector outputs is required for bidirectional data paths. The LS logic family offers standard TTL compatibility. Consider the 20-pin PDIP package for through-hole mounting needs. Verify that the open-collector nature meets the system's pull-up resistor requirements and voltage levels.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the SN74LS64x family of octal bus transceivers manufactured by Texas Instruments. It shares functional similarities with other members like the SN74LS641 but differs in output stage design. The SN74LS642N specifically utilizes open-collector outputs, distinguishing it from three-state variants within the same logical grouping.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74LS642-1N serves as a direct replacement offering identical functionality and pinout in the same PDIP package.