SNJ54ABT646AJT

Buffers, Drivers, Receivers, Transceivers Overview

The SNJ54ABT646AJT is a military-grade octal bus transceiver and register featuring three-state outputs. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range from -55°C to +125°C. The device provides high-drive outputs with a low-level output current of 64 mA and a high-level output current of -32 mA. It incorporates Ioff circuitry for partial-power-down support and latch-up performance exceeding 500 mA per JEDEC standards.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Supports multiplexed transmission of data directly from the input bus or internal registers via dedicated clock inputs.
• Includes select-control inputs to enable real-time transparent mode or transfer stored data to buses.
• Features isolation mode allowing independent storage of A and B bus data when outputs are disabled.
• Provides ESD protection exceeding 2000-V human-body model and 200-V machine model standards.

Buffers, Drivers, Receivers, Transceivers Applications

• Military and defense electronic systems requiring extended temperature operation
• High-speed data bus management in aerospace applications
• Partial-power-down scenarios in critical infrastructure equipment

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify that the specific ordering suffix JT corresponds to the CDIP ceramic package, as this determines physical footprint and thermal characteristics. Confirm that the QML certification status meets the specific requirements of the target military or defense application before finalizing procurement decisions.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when designing systems that require robust bus management with registered data storage capabilities under extreme environmental conditions. The ABT logic family offers superior speed compared to standard TTL while maintaining compatibility with CMOS interfaces. Ensure adequate thermal management is planned due to the high drive currents available at the outputs.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SN54ABT646A series, which represents the military-grade variant of Texas Instruments' octal bus transceivers. Unlike the commercial SN74ABT646A, the SN54ABT646A is qualified for wider temperature ranges and higher reliability standards. The JT suffix specifically denotes the hermetically sealed ceramic dual-in-line package suitable for harsh environments.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SNJ54ABT646AW (CFP package)

Buffers, Drivers, Receivers, Transceivers FAQ

How does the SAB/SBA control affect data flow?

The SAB and SBA inputs allow the user to multiplex between real-time data transfer from the input bus and previously stored data held in the internal registers.

What is the function of the Ioff circuitry?

The Ioff circuitry disables the outputs when the device is powered down, preventing damaging current backflow through the device during partial-power-down modes.