FST6800MTCX

Overview

The FST6800MTCX is a 10-bit bus switch with precharged outputs manufactured by onsemi. It operates within a supply voltage range of 4.0V to 5.5V and supports an input/output voltage range of 0V to 5.5V. The device features a typical on-resistance of 4Ω at VCC=4.5V and VIN=0V, with a maximum propagation delay of 0.25ns. It includes a BiasV pin for output precharging to minimize live insertion noise. The component is housed in a 24-lead Thin Shrink Small Outline Package (TSSOP) and functions as a TTL-compatible high-speed CMOS bus switch.

Feature Summary

• Provides 10 bits of high-speed CMOS bus switching with minimal propagation delay.
• Features output precharge capability via the BiasV pin to reduce live insertion noise.
• Ensures zero bounce operation in flow-through mode.
• Control inputs are compatible with TTL logic levels.

Applications

• High-speed data bus interconnects
• Portable electronic devices requiring low power consumption
• Systems utilizing hot-swap or live-insertion interfaces

Procurement Notes

Verify the specific package variant when ordering, as the datasheet lists multiple options including SOIC and QSOP. Confirm that the 'X' suffix corresponds to tape and reel packaging if required for automated assembly. Ensure the design accommodates the 24-lead TSSOP footprint dimensions specified in the physical drawings. Validate electrical characteristics against the recommended operating conditions table prior to implementation.

Selection Notes

Select this component for applications requiring low on-resistance and fast signal transmission between buses. The precharge feature makes it suitable for scenarios involving live connection events. Ensure the control logic meets the specified TTL compatibility requirements. Verify that the operating temperature range aligns with the environmental conditions of the target system.

Part Context

This part belongs to the Fairchild Switch family, which utilizes proven switch technology previously found in products like the FST3384. The FST6800 series is designed to provide efficient bus switching solutions with low power consumption. It represents a transition from Fairchild Semiconductor branding to ON Semiconductor following corporate integration.

Replacement Considerations

Check for updated part numbers due to the integration of Fairchild into ON Semiconductor, where underscores may be replaced by dashes. Verify pinout compatibility if substituting with other members of the FST switch family.

FAQ

How does the device handle live insertion?

The B Port is precharged to a selectable bias voltage through an equivalent resistor when the switch is open, which minimizes live insertion noise.

What is the propagation delay of the switch?

The propagation delay is typically 0.25ns, contributing no additional delay beyond the RC delay of the switch resistance and load capacitance.