SN74LS644-1N

Buffers, Drivers, Receivers, Transceivers Overview

The SN74LS644-1N is an octal bus transceiver from the Texas Instruments SN74LS series, designed for bidirectional data transmission. It features open-collector outputs and operates within a supply voltage range of 4.75 V to 5.25 V. The device utilizes a 20-pin PDIP package with through-hole mounting. It supports TTL input levels and provides eight channels of data transfer capability.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal bus transceiver architecture supporting bidirectional data flow
• Open-collector output configuration suitable for wired-OR applications
• Compatible with standard TTL logic input levels

Buffers, Drivers, Receivers, Transceivers Applications

• Bidirectional data bus systems requiring open-drain termination
• TTL-to-TTL interface circuits in digital logic designs
• Microprocessor-based system data routing

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix '-1' indicates the open-collector variant distinct from the three-state versions in the same family. Confirm the PDIP package availability as some variants may be obsolete or restricted. Check RoHS compliance status for the specific ordering code before finalizing procurement.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when open-collector outputs are required for bus sharing or level shifting within the 5V logic domain. Ensure the application does not require high-speed switching, as LS logic offers moderate propagation delays compared to advanced families. Verify that the load capacitance requirements align with the open-collector drive capabilities.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SN74LS64x family of octal bus transceivers. It shares the same pinout and basic functionality as the SN74LS640-1N and SN74LS641-1N but differs in output stage design. The 'SN74' prefix denotes commercial temperature range operation, while 'LS' indicates Low-power Schottky technology.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74LS640-1N (Three-state output), SN74LS641-1N (Non-inverting open-collector). Note that output type and polarity differences must be evaluated for circuit compatibility.