74FST6800QSR

Overview

The onsemi 74FST6800QSR is a 10-bit bus switch with precharged outputs, housed in a QSOP-24 package. It operates between 4.0 and 5.5 volts and exhibits CMOS TTL compatibility. The device features extremely low on-resistance (RON) of typically 4 ohms at VCC=4.5V and adds nearly zero propagation delay, specified as less than 0.25 ns maximum. It draws nearly zero standby current and introduces no circuit bounce or ground noise to the system.

Feature Summary

• Precharged outputs for minimal switching noise
• Extremely low on-resistance and negligible propagation delay
• TTL/CMOS compatible control inputs
• Pin-for-pin compatible with QS6800, FST6800, and CBT6800

Applications

• High-speed data bus switching applications
• System interconnects requiring low signal distortion
• Digital logic level translation interfaces

Procurement Notes

Verify the specific suffix 'QS' confirms the QSOP-24 package type when ordering. Ensure the supply voltage remains within the 4.0 to 5.5 V range for proper functionality. Confirm that unused control inputs are tied to valid logic levels rather than left open to prevent undefined states. Check datasheet thermal resistance values if operating near temperature limits.

Selection Notes

Select this component for designs requiring 10-bit parallel data path switching with minimal latency. The QSOP-24 package suits space-constrained surface-mount layouts. Consider the typical 4 ohm on-resistance for signal integrity requirements. Verify compatibility with existing system voltage rails before integration.

Part Context

This device belongs to the 74FST family of high-speed bus switches. It serves as a direct replacement for similar parts like the QS6800, FST6800, and CBT6800 due to pin compatibility. The technology focuses on reducing signal degradation during bus transitions while maintaining low power consumption in standby modes.

Replacement Considerations

Publicly confirmed substitutes include QS6800, FST6800, and CBT6800 due to pin-for-pin compatibility. Verify package dimensions match the QSOP-24 form factor when swapping. Ensure electrical characteristics such as RON and propagation delay meet system specifications.