FST34X245QSP

Overview

The FST34X245QSP is a 32-bit high-speed CMOS bus switch manufactured by Fairchild Semiconductor. It operates within a supply voltage range of 4V to 5.5V and features TTL-compatible inputs. The device provides tri-state outputs with a maximum propagation delay of 0.25ns at 4.5V-5.5V with a 50pF load. Quiescent current is specified at 3uA. It is housed in an 80-QVSOP package.

Feature Summary

• Provides 32-bits of high-speed bus switching capability
• Features standard flow-through mode operation
• Ensures TTL compatibility for CMOS applications
• Delivers tri-state output functionality

Applications

• High-speed data bus switching
• Memory interface systems
• Microprocessor system interconnects

Procurement Notes

Verify the specific manufacturer source, as this component may be distributed by entities such as Rochester Electronics LLC. Confirm RoHS compliance status and check for active versus obsolete status notifications prior to procurement. Ensure the 80-QVSOP package variant matches the design requirements exactly.

Selection Notes

Select this component when a 32-bit wide bus switch is required for high-speed digital interfaces. The low propagation delay makes it suitable for timing-critical applications. Verify that the operating voltage range of 4V to 5.5V aligns with the system power rails and that the 80-QVSOP package fits the PCB layout constraints.

Part Context

This part belongs to the FST series of bus switches from Fairchild Semiconductor. It serves as a signal switch solution for connecting multiple buses or isolating sections of a circuit. The device is designed to replace older logic families with faster, lower-power alternatives while maintaining compatibility with existing system architectures.

Replacement Considerations

The QS34X245Q3G8 from Renesas Electronics is a documented substitute within the same functional family. Both are 32-bit bus switches. Verify pinout compatibility and electrical specifications before substitution.