FSTU3253MX

Overview

The FSTU3253MX is a dual 4:1 multiplexer/demultiplexer bus switch manufactured by Fairchild Semiconductor. It features a low on-resistance of 4 ohms, enabling signal connection without adding propagation delay or generating ground bounce noise. The device operates with control inputs compatible with TTL levels and exhibits zero bounce in flow-through mode. It utilizes CMOS technology and is housed in a 16-pin SSOP package.

Feature Summary

• Dual 4:1 Multiplexer/Demultiplexer Bus Switch
• Low On-Resistance for Minimal Propagation Delay
• TTL-Compatible Control Inputs
• Zero Bounce in Flow-Through Mode

Applications

• High-speed data routing
• Bus switching applications
• Signal path selection

Procurement Notes

Verify the manufacturer designation, as Rochester Electronics also lists this part number. Confirm the specific package type (SSOP) and ensure the component meets required operating temperature ranges (-40°C to +85°C). Cross-reference datasheets from both Fairchild and Rochester Electronics to confirm pinout and electrical characteristics match your design requirements before procurement.

Selection Notes

Select this component when a dual 4:1 mux/demux function is required with minimal signal distortion. The low on-resistance makes it suitable for high-speed applications where propagation delay must be minimized. Ensure the system voltage and logic levels are compatible with the TTL-compatible control inputs specified in the datasheet.

Part Context

This component belongs to the FST3253 series of high-speed CMOS bus switches. It is functionally similar to the FST3253 but may differ in packaging or manufacturing origin depending on the supplier. The 'U' suffix typically indicates a specific package variant, while 'MX' denotes the tape and reel packaging format.

Replacement Considerations

The FST3253MTC is a verified functional substitute within the same series. Verify pin compatibility and package dimensions before substitution.