SN74CBTD3384CPW

Overview

The SN74CBTD3384CPW 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 includes an integrated diode to VCC for level shifting from 5-V inputs down to 3.3-V outputs. It supports partial-power-down mode via Ioff, ensuring no backflow current when powered down. The IC operates within a supply voltage range of 4.5 V to 5.5 V and withstands undershoot up to -2 V on A and B ports. It is housed in a 24-pin TSSOP package.

Feature Summary

• Integrated diode to VCC provides level shifting for 5-V input down to 3.3-V output levels
• Active Undershoot-Protection Circuitry protects against undershoot up to -2 V on A and B ports
• Supports partial-power-down applications using Ioff feature to prevent damaging backflow current
• Bidirectional data flow with low ON-state resistance allowing minimal propagation delay

Applications

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

Procurement Notes

Verify the specific ordering suffix 'PW' corresponds to the TSSOP-24 tube packaging configuration. Confirm RoHS compliance status and lead finish details (NIPDAU) match project requirements. Ensure the operating temperature range of -40°C to 85°C aligns with environmental specifications. Check for any recent Product Change Notifications (PCN) affecting material or design revisions.

Selection Notes

Select this component for designs requiring high-speed switching with low distortion. The integrated level-shifting diode simplifies interfacing between 5-V and 3.3-V domains without external components. The active undershoot protection enhances reliability in noisy environments. Consider the TSSOP package constraints for PCB layout and thermal management during selection.

Part Context

This part belongs to the SN74CBTD3384C series of digital bus switches. It is designed for high-performance data routing applications where signal integrity is critical. The device integrates two independent 5-bit bus switches, offering flexibility in system architecture. It is part of Texas Instruments' broader portfolio of logic and switching solutions.

Replacement Considerations

SN74CBTD3384CDWR

FAQ

How does the device handle partial-power-down scenarios?

The Ioff feature ensures that damaging current will not backflow through the device when it is powered down, providing isolation during power off.

What is the function of the integrated diode to VCC?

The integrated diode allows the device to perform level shifting, enabling 5-V input signals to be correctly interpreted as 3.3-V output levels.