SN74LS540DW

Buffers, Drivers, Receivers, Transceivers Overview

The SN74LS540DW is an octal buffer and line driver manufactured by Texas Instruments, belonging to the 74LS logic series. It features eight inverting outputs with three-state capability, housed in a 20-SOIC package. The device operates within a supply voltage range of 4.75V to 5.25V and supports a commercial operating temperature range from 0°C to +70°C. Key electrical characteristics include a high-level output current of -15mA and a low-level output current of 24mA, with a typical propagation delay of 15ns at 5V.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal configuration providing eight independent inverting buffer channels for parallel data handling.
• Three-state output architecture enables direct connection to system buses without external switching logic.
• Inverting polarity allows signal phase reversal while maintaining standard TTL input compatibility.

Buffers, Drivers, Receivers, Transceivers Applications

• Memory address drivers for microprocessor systems
• Clock signal distribution networks
• Bus-oriented transmitters and receivers

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix 'DW' corresponds to the SOIC-20 surface-mount package variant when sourcing. Confirm RoHS compliance status and lead times directly with authorized distributors or Texas Instruments, as availability varies by region. Ensure the procurement channel provides original manufacturer packaging to guarantee component authenticity and traceability.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when an octal inverting buffer with bus isolation is required. The LS series offers moderate speed suitable for general-purpose digital logic. Consider the pinout orientation relative to the 74LS240 if board layout constraints exist. Verify that the 5V logic family aligns with the target system's voltage levels and noise immunity requirements.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the Texas Instruments 74LS540 family of octal buffers. It shares functional equivalence with the SN74LS240 but utilizes an inverted pinout arrangement. This design facilitates easier interface connections to microprocessors by positioning inputs and outputs on opposite sides of the package, thereby improving printed circuit board density and routing efficiency.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

The SN74LS240 is a functional equivalent with identical logic but reversed pinout. Cross-reference with other manufacturers' 74LS540 variants for pin-compatible substitution. Verify that any replacement maintains the same three-state control logic and voltage specifications.