74FST3861DTR2

Overview

The onsemi 74FST3861DTR2 is a 10-bit high-performance bus switch manufactured using CMOS technology. It operates within a supply voltage range of 4.0 to 5.5 Volts and maintains TTL compatibility in this range. The device features an extremely low on-resistance (RON) with a typical value of 4 ohms at VCC = 4.5V, ensuring minimal signal attenuation. Propagation delay is less than 0.25 ns maximum, adding negligible latency to the system. Quiescent supply current is nearly zero, contributing to low standby power consumption.

Feature Summary

• Provides bidirectional data transmission across ten independent channels with virtually no propagation delay.
• Maintains system integrity by eliminating circuit bounce and preventing ground noise injection during switching operations.
• Features control inputs that are fully compatible with both TTL and CMOS logic levels for flexible interfacing.

Applications

• High-speed parallel data bus routing in computing systems
• Signal path selection in telecommunications equipment
• Data buffering and isolation in industrial control networks

Procurement Notes

Verify the specific package suffix matches the required form factor, as the DTR2 designation indicates TSSOP-24 packaging. Confirm RoHS compliance status and Pb-Free characteristics directly from the manufacturer's latest documentation before finalizing procurement specifications.

Selection Notes

Select this component when low insertion loss and high bandwidth are critical for multi-line data paths. Ensure the operating environment stays within the specified -40°C to +85°C temperature range. Verify that the control signals meet the required voltage thresholds for reliable OE pin activation.

Part Context

This device belongs to the FST (Fast Switching Technology) family designed for high-speed digital applications. It serves as a direct replacement for similar bus switches like the QS3861 and CBT3861 due to its pin-for-pin compatibility, facilitating easier upgrades in existing PCB layouts without redesigning the footprint.

Replacement Considerations

Pin-for-pin compatible substitutes include the QS3861, FST3861, and CBT3861. Verify electrical parameters such as RON and leakage current against these alternatives to ensure functional equivalence in the target application.

FAQ

Is the 74FST3861DTR2 suitable for single-ended or differential signaling?

The datasheet describes it as a 10-bit bus switch connecting Bus A to Bus B. It is typically used for single-ended parallel data buses rather than differential pairs.

What happens to the outputs when the OE pin is high?

When the Output Enable (OE) input is High, the switch disconnects, placing the A and B ports in a high-impedance state.