SN74CBTD3384CDBQR

Overview

The SN74CBTD3384CDBQR is a high-speed TTL-compatible FET bus switch manufactured by Texas Instruments. It features low ON-state resistance and bidirectional data flow with near-zero propagation delay. The device supports a VCC operating range from 4.5 V to 5.5 V and handles data I/O levels from 0 V to 5 V. It includes active undershoot protection up to -2 V on A and B ports, an integrated diode for level shifting, and Ioff support for partial-power-down applications.

Feature Summary

• Active undershoot-protection circuitry ensures proper OFF state during negative voltage events on A and B ports.
• Integrated series diode provides level shifting capability for 5-V input signals down to 3.3-V output levels.
• Ioff feature prevents damaging backflow current when the device is powered down in partial-power-down modes.
• Low input/output capacitance minimizes signal loading and distortion during operation.

Applications

• Memory interleaving
• Bus isolation
• Low-distortion signal gating

Procurement Notes

Verify the specific package type (SSOP-DBQ) and tape-and-reel quantity against project requirements. Confirm RoHS compliance and lead finish specifications match assembly constraints. Ensure control inputs are tied to VCC or GND to prevent floating states. Check moisture sensitivity level ratings for reflow soldering profiles.

Selection Notes

Select this component for designs requiring bidirectional switching with minimal signal degradation. The integrated level-shifting diode simplifies interfacing between 5-V and 3.3-V domains without external components. Undershoot protection enhances reliability in noisy environments. Verify that the 24-pin SSOP footprint fits the PCB layout constraints.

Part Context

This part belongs to the SN74CBTD3384C family of digital bus switches. It is designed for high-speed data routing in systems where signal integrity and power management are critical. The DBQ suffix indicates a specific SSOP package variant optimized for surface-mount assembly.

Replacement Considerations

SN74CBTD3384CDWRG4

FAQ

How does the device handle undershoot events?

Active undershoot-protection circuitry senses undershoot events on the A and B ports and ensures the switch remains in the proper OFF state, protecting against voltages down to -2 V.

What is the function of the Ioff feature?

The Ioff feature ensures that damaging current will not backflow through the device when it is powered down, supporting partial-power-down mode operations.