74FST3384QSR

Overview

The onsemi 74FST3384QSR is a 10-bit low power bus switch designed for high-speed data routing. It operates within a supply voltage range of 4.0 V to 5.5 V and features CMOS/TTL compatible inputs. The device provides two independent control inputs (OE1, OE2) to manage ten bidirectional switches connecting Bus A to Bus B. Key electrical parameters include a maximum propagation delay of 0.25 ns at 4.5–5.5 V, an on-resistance (RON) typically ranging from 4 Ω to 11 Ω depending on load conditions, and nearly zero standby current. It is housed in a QSOP-24 package.

Feature Summary

• Ultra-low propagation delay ensures minimal signal latency during switching operations.
• Low on-resistance minimizes signal attenuation across the bus path.
• Independent dual enable controls allow flexible partitioning of the 10-bit bus.
• TTL/CMOS compatible control inputs simplify interface with standard logic families.

Applications

• High-speed data bus switching in computer systems
• Signal routing in telecommunications equipment
• Data acquisition systems requiring low-latency switching

Procurement Notes

Verify that the ordering suffix 'QS' corresponds to the QSOP-24 package configuration required for your PCB layout. Confirm RoHS compliance status and Pb-Free designation if environmental regulations apply to your assembly process. Ensure the specific revision level matches your design documentation requirements before finalizing procurement.

Selection Notes

Select this component when low insertion loss and high-speed performance are critical for 10-bit parallel data paths. The 4.0 V to 5.5 V operating range makes it suitable for 5 V logic systems. Consider the QSOP-24 package constraints regarding board space and thermal dissipation compared to SOIC or TSSOP alternatives.

Part Context

This part belongs to the 74FST series of Fast Switch Technology devices, optimized for high-frequency applications. It serves as a direct replacement for similar FST bus switches, offering pin-for-pin compatibility with other manufacturers' equivalents like the QS3384 and CBT3384 within the same functional family.

Replacement Considerations

Public confirmed substitutes include 74FST3384DW, 74FST3384DTR2, and 74FST3384DT. These variants offer identical functionality but differ in packaging (SOIC-24, TSSOP-24). Verify pinout compatibility and thermal characteristics when transitioning between package types.

FAQ

How does the 74FST3384 handle input transitions?

The device supports input transition rates up to 5 ns/V at VCC = 5.0 V, ensuring compatibility with fast digital signals without distortion.

What is the latchup performance rating?

The device exhibits latchup performance exceeding 500 mA at 85°C, tested according to EIA/JESD78 standards, ensuring robustness against transient currents.