SNJ54F245J

Overview

The SNJ54F245J is an octal bus transceiver featuring three-state outputs, designed for asynchronous communication between data buses. It facilitates bidirectional data transmission between the A and B buses based on the logic level at the direction-control (DIR) input. The output enable (OE) input isolates the buses when disabled. This device belongs to the F/FAST logic series and is characterized for operation over the full military temperature range of -55 °C to 125 °C. It utilizes a 20-pin Ceramic Dual In-Line Package (CDIP).

Feature Summary

• Bidirectional data transmission capability between two 8-bit buses controlled by a single DIR input.
• Three-state outputs allow direct connection to bus lines while providing effective isolation via the OE input.
• Military-grade characterization ensuring reliable performance across the extended temperature range of -55 °C to 125 °C.

Applications

• Asynchronous communication interfaces between data buses in military systems.
• High-performance memory mapping applications requiring bus isolation.
• Control signal management in defense and aerospace electronic architectures.

Procurement Notes

Verify that the specific part number SNJ54F245J corresponds to the ceramic dual in-line package variant intended for military specifications. Confirm the operating temperature range matches the required -55 °C to 125 °C specification. Ensure compatibility with existing board layouts utilizing the 20-pin CDIP footprint. Validate that the F/FAST logic family characteristics align with system timing requirements.

Selection Notes

Select this component when military-grade reliability and wide temperature tolerance are mandatory. The SNJ54F245J is suitable for applications requiring robust bidirectional bus driving capabilities. Consider the ceramic packaging for enhanced durability in harsh environments compared to plastic alternatives. Ensure the design accommodates the specific pinout and electrical characteristics defined for the F-series logic family.

Part Context

This component is part of the SN54F245 family of octal bus transceivers manufactured by Texas Instruments. The 'SNJ' prefix indicates a military-qualified version housed in a ceramic dual in-line package. It shares functional similarities with commercial variants like the SN74F245 but offers extended environmental resilience. The device serves as a critical interface element in complex digital systems requiring isolated bidirectional data paths.

Replacement Considerations

Direct replacements include other military-qualified variants within the same family, such as SNJ54F245W or SNJ54F245FK, provided the package type matches the application constraints. Cross-family substitutions require careful evaluation of switching speeds and drive currents.