SNJ54HC245W

Overview

The SNJ54HC245W is an octal bus transceiver with three-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 2 V to 6 V and supports bidirectional data transmission between two 8-bit buses (A and B). The device features direction control via the DIR input and isolation capability through the OE input. It utilizes HC CMOS technology, providing low power consumption and high noise immunity. The component is housed in a 20-lead Ceramic Flat Package (CFP) and is rated for operation across a military temperature range of -55°C to 125°C.

Feature Summary

• Bidirectional data transfer between A and B buses controlled by logic levels
• Three-state outputs allow effective bus isolation when disabled
• Wide operating voltage range from 2 V to 6 V
• Low power consumption with minimal input current

Applications

• Servers
• PCs and Notebooks
• Network Switches
• Telecom Infrastructures

Procurement Notes

Verify the specific ordering suffix 'W' corresponds to the 20-lead CFP package configuration. Confirm that the MIL-PRF-38535 compliance status matches project requirements, as parameter testing protocols differ for military-grade versus standard production processing. Ensure the procurement channel provides traceability documentation consistent with the manufacturer's specifications for this part number.

Selection Notes

Select this component for applications requiring asynchronous two-way communication between data buses where wide voltage flexibility is necessary. The HC series offers slower edge rates compared to faster logic families, which helps minimize output ringing. Consider the CFP package constraints regarding board space and thermal management when integrating into the system design.

Part Context

This device belongs to the SNx4HC245 family of octal bus transceivers. It shares functional similarities with other members like the SNJ54LS245J and SNJ54ALS245AJ but differs significantly in technology, speed, and power characteristics. The HC series represents a high-speed CMOS implementation distinct from the older TTL-compatible LS or ALS variants.

Replacement Considerations

SNJ54LS245J

FAQ

How does the device isolate the buses?

The Output Enable (OE) input can be used to disable the device, placing the outputs in a high-impedance state so that the buses are effectively isolated.

What determines the direction of data flow?

Data transmission direction is determined by the logic level at the Direction Control (DIR) input, allowing transfer from A to B or B to A.