SN74LS644-1N3

Buffers, Drivers, Receivers, Transceivers Overview

The SN74LS644-1N3 is an octal bus transceiver from the Texas Instruments LS series of TTL logic devices. It features eight bits per element with true output configuration and open-collector outputs, housed in a 20-pin PDIP package. The device operates within a supply voltage range of 4.75V to 5.25V and supports a propagation delay of 15ns at 5V with a 45pF load. Designed for bidirectional data communication on buses, it utilizes Schmitt trigger inputs to ensure noise immunity and stable switching characteristics in digital systems.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal bus transceiver architecture supporting bidirectional data transfer
• Open-collector output structure providing flexible interfacing capabilities
• Schmitt trigger input design for enhanced noise rejection

Buffers, Drivers, Receivers, Transceivers Applications

• Bidirectional data communication on system buses
• Memory interface circuits requiring open-collector termination
• Digital signal routing in TTL-based logic systems

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific revision level and manufacturing date code against current production schedules. Confirm that the PDIP-20 package matches your PCB footprint requirements. Ensure compatibility with standard 5V TTL logic levels and check for any lead-free or RoHS compliance certifications if required by your assembly process specifications.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when an octal transceiver with open-collector outputs is required for bus applications. The LS series offers a balance of speed and power consumption suitable for general-purpose digital designs. Consider the 15ns propagation delay and 4.75V-5.25V operating range to ensure timing and voltage compatibility with other system components.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SN74LS64x family of octal bus transceivers manufactured by Texas Instruments. The LS series represents low-power Schottky TTL technology, widely used in legacy and industrial digital electronics. The -1N3 suffix typically denotes a specific package variant or testing condition within the PDIP-20 form factor, distinguishing it from surface-mount or alternative pinout versions.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Compatible substitutes include other SN74LS64x variants such as SN74LS640 or SN74LS641, provided the output polarity (true vs. inverted) matches the circuit design. Verify pinout compatibility and electrical parameters before substitution.