SNJ54AS646JT

Overview

The SNJ54AS646JT is an octal bus transceiver and register with 3-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and supports clock frequencies up to 90 MHz. The device features independent registers for A and B buses, allowing multiplexed real-time and stored data transmission. It is housed in a 24-pin Ceramic Dual In-Line Package (CDIP) and is characterized for operation over the full military temperature range of -55°C to 125°C.

Feature Summary

• Independent storage registers for both A and B buses enable simultaneous data capture and isolation.
• Multiplexing capability allows selection between real-time transparent data transfer and previously stored register data.
• Direction control inputs determine the flow direction of data between the two octal buses.
• Output-enable controls the 3-state output drivers to prevent bus contention.

Applications

• High-speed bidirectional bus management systems
• Data buffering and latching in computer architectures
• Multiplexed data routing in military-grade electronic equipment

Procurement Notes

Verify that the component matches the SNJ54AS646JT designation specifically, as suffixes indicate package type and temperature rating. Confirm the ceramic dual in-line package construction is required for the application environment. Ensure the supplier provides documentation verifying compliance with the specified military temperature range characteristics.

Selection Notes

Select this component when high-speed bidirectional data transfer with internal storage is required. The AS series offers faster switching speeds compared to ALS variants. Verify that the 3-state output configuration meets the system's bus isolation requirements. Consider the operating temperature range if the application involves extreme environmental conditions.

Part Context

This device belongs to the AS logic family, designed for high-speed applications. It is part of a broader series including ALS variants and inverting versions like the SN54AS648. The JT suffix denotes a specific ceramic package suitable for rugged environments. It serves as a bridge between microprocessors and peripheral devices requiring buffered and registered connections.

Replacement Considerations

SNJ54ALS646JT