54F240DM

Overview

The 54F240DM is an octal buffer and line driver manufactured by National Semiconductor, now part of Texas Instruments. It belongs to the 54F series of high-speed Schottky logic devices. The component features tri-state outputs, allowing multiple drivers to share a bus without interference. Designed for military-grade reliability, it supports wide operating temperature ranges and provides robust signal buffering capabilities for asynchronous data communications.

Feature Summary

• Octal configuration providing eight independent buffer channels
• Tri-state output capability for effective bus sharing
• High-speed Schottky (F) logic family performance
• Military-grade qualification for harsh environments

Applications

• Asynchronous data communication systems
• Bus-oriented memory and I/O mapping
• Clock distribution networks requiring low skew
• Military avionics and defense electronics

Procurement Notes

Verify the manufacturer source carefully, as National Semiconductor was acquired by Texas Instruments. Confirm that the specific DM suffix corresponds to the 14-lead ceramic dual-in-line package. Ensure the device meets current environmental compliance standards if required for modern assembly processes, noting its legacy status.

Selection Notes

Select this component when military-grade reliability and high-speed switching are required for octal buffering applications. Compare against the 54LS240 for lower power consumption needs or the 54ABT240 for advanced BiCMOS technology. Ensure voltage levels and package compatibility match the target system design constraints.

Part Context

This device is part of the broader 54-series military logic family, distinct from the commercial 74-series. It serves as a critical interface component in systems requiring high noise immunity and fast propagation delays. The DM package variant specifically denotes a ceramic construction suitable for demanding thermal and mechanical conditions.

Replacement Considerations

Direct substitutes include the DM54F240 and other variants within the 54F24x family such as the 54F241. Cross-reference with HD74F240 from Hitachi for pin-compatible alternatives. Verify that any replacement maintains the same military qualification level and ceramic packaging specifications.