SN74LS243NS

Buffers, Drivers, Receivers, Transceivers Overview

The SN74LS243NS is an octal bus transceiver from the Texas Instruments SN74LS series, designed for bidirectional data transmission. It features three-state outputs and operates with a supply voltage range of 4.75 V to 5.25 V. The device provides low-level output current of 8 mA and high-level output current of -400 µA. Propagation delay is typically 16 ns at 5 V. It is housed in a 20-pin Small Outline (SO) package suitable for surface mount applications.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Provides bidirectional data transfer between two eight-bit buses
• Features three-state outputs to isolate the bus when disabled
• Compatible with standard TTL logic levels

Buffers, Drivers, Receivers, Transceivers Applications

• Bidirectional data bus drivers
• Memory-to-memory transfers
• Microprocessor systems

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix 'N' indicates the SOIC-20 package variant. Confirm RoHS compliance status as it varies by manufacturing date code. Ensure the supplier provides the official datasheet for timing parameters. Check for lead-free availability if required by assembly standards.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component for designs requiring bidirectional octal data flow with TTL compatibility. Compare propagation delays against system clock speeds. Verify that the 8 mA sink current meets load requirements. Consider the SN74LS245 for similar functionality if pinout differences are acceptable.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SN74LS family of Low-power Schottky logic devices. These components offer faster switching speeds than standard LS logic while consuming less power than S-series devices. The SN74LS243 specifically functions as an octal transceiver within this hierarchy.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

The SN74LS244N serves as a functional substitute but is configured as a buffer/driver rather than a bidirectional transceiver. Direct replacement requires verifying control signal polarity and directionality requirements.