SN74CBT3384CDW

Overview

The SN74CBT3384CDW is a high-speed TTL-compatible FET bus switch manufactured by Texas Instruments. It features two independent 5-bit bus switches housed in a 24-pin SOIC (DW) package. The device operates within a supply voltage range of 4 V to 5.5 V and supports bidirectional data flow with near-zero propagation delay. Key electrical characteristics include a typical ON-state resistance of 3 Ω, low input/output capacitance of 5 pF, and maximum supply current of 3 µA. It provides active undershoot protection up to -2 V on the A and B ports.

Feature Summary

• Active undershoot-protection circuitry ensures proper OFF state during negative voltage events on data ports.
• Supports partial-power-down mode via Ioff feature to prevent damaging backflow currents when powered down.
• Control inputs are compatible with TTL or 5-V/3.3-V CMOS outputs for flexible logic interfacing.
• Data I/Os support multiple signaling levels ranging from 0.8 V to 5 V.

Applications

• PCI interface applications
• Memory interleaving systems
• Bus isolation circuits
• Low-distortion signal gating

Procurement Notes

Verify the specific ordering suffix 'DW' corresponds to the tube packaging format rather than tape and reel variants like 'DWR'. Confirm that the component meets RoHS3 compliance standards as indicated in the manufacturer's documentation. Ensure the operating temperature range aligns with industrial requirements of -40°C to 85°C before finalizing procurement specifications.

Selection Notes

Select this component when designing systems requiring low ON-state resistance and minimal signal distortion for high-speed data buses. The dual 5-bit configuration allows for flexible organization as either two separate 5-bit switches or one combined 10-bit switch. Ensure control inputs are pulled to VCC or GND to maintain the high-impedance state during power-up or power-down sequences.

Part Context

This part belongs to the SN74CBT3384C series of high-speed FET bus switches. It is functionally similar to other devices in the family but distinguished by its specific 24-pin SOIC package designation. The series is designed for applications demanding low power consumption and fast switching speeds within standard 5-V logic environments.

Replacement Considerations

SN74CBT3384CDWR

FAQ

How does the device handle undershoot events?

The SN74CBT3384CDW includes active undershoot-protection circuitry on the A and B ports that senses undershoot events up to -2 V and ensures the switch remains in the correct OFF state.

What is the purpose of the Ioff feature?

The Ioff feature supports partial-power-down mode operation, ensuring that damaging current will not backflow through the device when it is powered down while the system remains active.