FST3383MTCX

Overview

The FST3383MTCX 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 an ultra-low on-resistance of 5Ω typical at VCC=4.75V and 10Ω at VCC=10V. The device operates as a 10-bit bus switch or a 5-bit bus exchanger using the BX signal for nibble swapping. It features zero propagation delay in flow-through mode and ultra-low quiescent supply current (ICC) of 0.2μA typical. The MTCX suffix indicates a Tape and Reel packaging format.

Feature Summary

• Provides configurable 10-bit bus switching or 5-bit bus exchange functionality via dedicated control signals.
• Features ultra-low on-resistance to minimize signal attenuation without adding propagation delay.
• Supports byte swapping and quad 2-to-1 multiplexer configurations through the bus exchange mechanism.
• Operates with zero ground bounce noise in flow-through mode and maintains compatibility with TTL logic levels.

Applications

• Byte swapping of buses in system architectures
• Low delay barrel shifter creation
• Quad 2-to-1 multiplexer implementation

Procurement Notes

Verify that the ordering code includes the 'MTC' package designation for Thin Shrink Small Outline Package and the 'X' suffix for tape and reel configuration. Confirm the manufacturer origin, noting the datasheet attributes the part to Fairchild Semiconductor, which was acquired by onsemi. Ensure the specific lot date codes align with current production standards for legacy components.

Selection Notes

Select this component when designing systems requiring bidirectional data routing with minimal signal degradation. The device is suitable for applications needing flexible bus topology reconfiguration, such as memory interfaces or peripheral connections. Consider the 24-pin TSSOP package constraints regarding board space and thermal dissipation requirements relative to the 0.5W power dissipation rating.

Part Context

The FST3383 belongs to the FST (Fast Switch Technology) family, derived from proven switch technology used in products like the 74LVX3L384. This lineage ensures reliability in high-speed switching applications. The component serves as a bridge between different voltage domains or logical states within digital circuits, offering a compact solution for complex signal routing tasks.

Replacement Considerations

Check for direct pin-compatible alternatives within the FST series, such as the FST3384, though functional differences exist. Verify availability of equivalent parts from other manufacturers supporting similar bus exchange capabilities. Ensure any substitute matches the 24-pin TSSOP footprint and electrical characteristics, particularly the on-resistance and supply voltage range.

FAQ

How does the Bus Exchange (BX) signal affect the data paths?

When the Bus Enable (BE) is Low and BX is High, the device connects inputs A0-A4 to outputs D0-D4 and B0-B4 to C0-C4, effectively performing a nibble swap.

What is the maximum operating supply voltage?

The recommended operating conditions specify a supply voltage (VCC) range of 4.0V to 5.5V.