FST3253M

Overview

The FST3253M is a dual 4:1 high-speed CMOS TTL-compatible multiplexer/demultiplexer bus switch manufactured by Fairchild Semiconductor. It features a low on-resistance of 4 ohms between ports, enabling signal connection without adding propagation delay or generating additional ground bounce noise. The device operates with control inputs compatible with TTL levels and exhibits minimal propagation delay through the switch path. It maintains low supply current (ICC) and ensures zero bounce in flow-through mode operation.

Feature Summary

• Dual 4:1 multiplexer/demultiplexer architecture
• Low on-resistance for minimal signal degradation
• TTL-compatible control inputs
• Zero bounce in flow-through mode

Applications

• High-speed data routing
• Bus switching applications
• Signal multiplexing systems

Procurement Notes

Verify the manufacturer designation as Fairchild Semiconductor or its successor entity, ON Semiconductor, depending on production date. Confirm the package type corresponds to the specific suffix requirements for your assembly process. Ensure the component meets the required operating temperature range specifications for your intended application environment before procurement.

Selection Notes

Select this component when a dual 4:1 mux/demux function is required with low insertion loss. The CMOS technology ensures compatibility with standard logic families. Consider the package constraints and thermal requirements relative to the system design. Verify that the 4-ohm on-resistance meets the signal integrity needs of the connected circuitry.

Part Context

This part belongs to the FST3253 series of bus switches. Variants include different package options such as SOP and TSSOP. The series is designed for high-speed digital signal routing where low distortion and fast switching are critical. It serves as a bridge between different logic domains in complex electronic systems.

Replacement Considerations

Compatible substitutes include the FST3253MX and FST3253MTC from ON Semiconductor or Fairchild. These variants share the same functional description and electrical characteristics. Verify pinout compatibility and package dimensions before substitution.