FST3345MTC

Overview

The FST3345MTC is an 8-bit bus switch manufactured by onsemi, housed in a 20-lead Thin Shrink Small Outline Package (TSSOP). It operates within a supply voltage range of 4.0 V to 5.5 V and supports an operating temperature range from -40°C to +85°C. The device features dual output enable inputs (OE and /OE) for controlling the connection between Port A and Port B. Key electrical characteristics include a typical propagation delay of 0.25 ns at 4.5–5.5 V, a maximum on-resistance of 7 Ω, and a quiescent supply current of 3 µA.

Feature Summary

• Provides eight-bits of high-speed CMOS TTL-compatible bus switching with minimal propagation delay.
• Features low on-resistance to connect inputs to outputs without adding significant delay or ground bounce noise.
• Includes dual output enable inputs (OE and /OE) to control the connection state between ports.

Applications

• High-speed data bus switching applications
• System interconnects requiring low signal distortion
• Portable equipment with strict power consumption requirements

Procurement Notes

Verify that the specific part number matches the required package type and suffix. Confirm the ordering information against the official ON Semiconductor website, as Fairchild part numbers may have been updated following integration. Ensure compliance with RoHS directives and verify the correct packing method for your manufacturing needs.

Selection Notes

Select this component when designing circuits that require low insertion loss and high-speed data transfer across multiple bits. Consider the 4.0 V to 5.5 V operating voltage range and the TSSOP package dimensions. Evaluate the low quiescent current and minimal propagation delay for power-sensitive and high-frequency designs.

Part Context

The FST3345 is part of the FST series of bus switches developed by Fairchild Semiconductor, now integrated into ON Semiconductor's portfolio. This series focuses on providing high-performance switching solutions for digital systems. The device maintains compatibility with standard logic families while offering improved speed and lower power consumption compared to older technologies.

Replacement Considerations

Check the ON Semiconductor website for updated part numbers due to the Fairchild integration. Verify pinout compatibility and electrical specifications before substituting with other 8-bit bus switches. Ensure the replacement device meets the same voltage and temperature requirements.

FAQ

How does the FST3345 handle unused control inputs?

Unused control inputs must be held HIGH or LOW and may not float to ensure proper operation.

What is the maximum DC switch voltage supported by the FST3345?

The absolute maximum rating for the DC switch voltage (VS) is 7.0 V.