FST3383QSCX

Overview

The FST3383QSCX is a 10-bit low power bus-exchange switch manufactured by onsemi, formerly Fairchild Semiconductor. It provides two sets of high-speed CMOS TTL-compatible bus switches with a typical on-resistance of 5 ohms and zero propagation delay. The device operates as a 10-bit bus switch or a 5-bit bus exchanger using the BX signal for nibble swapping. It features ultra-low quiescent supply current (ICC) of 0.2 μA typical and zero ground bounce in flow-through mode. Operating conditions include a supply voltage range of 4.0V to 5.5V and an ambient temperature range of -40°C to +85°C. The component is housed in a 24-lead Quarter Size Outline Package (QSOP).

Feature Summary

• Provides two sets of high-speed CMOS bus switches with TTL-compatible control inputs.
• Enables 10-bit bus switching or 5-bit bus exchange functionality via dedicated control signals.
• Delivers ultra-low power consumption with minimal quiescent supply current.
• Ensures zero ground bounce noise during operation in flow-through mode.

Applications

• Byte swapping of buses in system architectures.
• Quad 2-to-1 multiplexer configurations.
• Creation of low delay barrel shifters.

Procurement Notes

Verify the specific package variant, as the FST3383 series includes SOIC, QSOP, and TSSOP options. Confirm that the QSCX suffix corresponds to the Quarter Size Outline Package (QSOP) with tape and reel packaging. Check for RoHS compliance status and ensure the source document matches the required lead-free specifications. Validate the manufacturer lineage from Fairchild to onsemi for accurate sourcing.

Selection Notes

Select this component when designing systems requiring byte swapping or multiplexing with minimal signal distortion. The zero propagation delay characteristic makes it suitable for high-speed data paths where timing integrity is critical. Ensure the application voltage remains within the 4.0V to 5.5V range and verify that the control logic levels are compatible with TTL standards.

Part Context

The FST3383 belongs to the FST (Fairchild Switch Technology) family, derived from proven bus switch technology previously used in products like the 74LVX3L384. This family focuses on providing high-performance switching solutions with low power consumption and compatibility with standard logic families. The device serves as a bridge for managing data flow between different bus segments efficiently.

Replacement Considerations

Direct replacements must match the 24-pin QSOP package and support the same 10-bit bus exchange functionality. Verify pinout compatibility and electrical characteristics, specifically the 5-ohm on-resistance and 4.0V-5.5V operating voltage range. Consider alternative packages such as SOIC or TSSOP if form factor adjustments are permissible.