54F540FMQB

Overview

The 54F540FMQB is an octal buffer and line driver manufactured by National Semiconductor. It features inverting logic with tri-state outputs, allowing for effective bus driving and signal buffering in high-speed digital systems. The device operates on a single 5 V supply and is housed in a 20-lead flatpack package. Designed for robust performance, it supports wide operating temperature ranges suitable for industrial applications.

Feature Summary

• Provides octal buffering with inverting functionality for signal integrity
• Features tri-state outputs to facilitate efficient bus sharing and isolation
• Engineered for high-speed operation within the F/FAST logic family

Applications

• High-speed data bus buffering and direction control
• Clock distribution networks requiring signal inversion
• Memory interface circuits for address and data lines

Procurement Notes

Verify the specific manufacturer revision and RoHS compliance status prior to procurement, as legacy components may vary. Confirm the exact package marking and pinout compatibility with your PCB footprint. Ensure that the voltage levels of your system align with the device's specified input and output thresholds to prevent signal integrity issues or potential damage during integration.

Selection Notes

Select this component when an octal inverting buffer with tri-state capability is required for bus architectures. It is suitable for designs needing high drive strength and fast switching speeds typical of the F-series logic. Consider the 20-lead flatpack form factor for space-constrained layouts where through-hole mounting is preferred over surface mount alternatives.

Part Context

This part belongs to the National Semiconductor 54F series, which utilizes standard TTL-compatible logic levels but offers improved speed characteristics. The 54F540 specifically addresses the need for eight-channel signal inversion and buffering. It is often used in conjunction with other F-series devices to create complex digital logic functions or interface different voltage domains in mixed-signal systems.

Replacement Considerations

Check for direct equivalents such as the 54FCT540 or 74FCT540 for CMOS-compatible interfaces. Verify pin-to-pin compatibility with other octal buffers like the 54LS244 if non-inverting logic is acceptable. Always confirm electrical specifications and package dimensions before substituting to ensure system reliability.