SN74CBTD3384CDWRE4

Overview

The SN74CBTD3384CDWRE4 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. Undershoot protection on A and B ports handles signals up to -2 V. Operating voltage ranges from 4.5 V to 5.5 V, with control inputs compatible with TTL or 5-V/3.3-V CMOS.

Feature Summary

• Integrated diode to VCC provides level shifting for 5-V input down to 3.3-V output levels
• Active undershoot-protection circuitry ensures proper OFF state during undershoot events up to -2 V
• Supports partial-power-down applications using Ioff feature to prevent damaging backflow current
• Bidirectional data flow with low ON-state resistance allows minimal propagation delay

Applications

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

Procurement Notes

Verify the package type matches the design requirements, as this part number corresponds to the TSSOP-24 (PW) tape and reel configuration. Confirm that the operating temperature range of -40°C to 85°C aligns with the system environment. Ensure control inputs are tied to VCC or GND to maintain proper operation. Check for RoHS compliance status if required by specific manufacturing standards.

Selection Notes

Select this component when designing systems requiring high-speed bus switching with low distortion. It is suitable for applications needing level shifting between 5-V and 3.3-V domains without external components. Consider its low capacitance characteristics to minimize loading effects on high-frequency signals. Verify that the supply voltage remains within the 4.5 V to 5.5 V range for optimal performance.

Part Context

This device belongs to the SN74CBTD3384C series of digital bus switches. It is organized as two independent 5-bit bus switches, which can function as separate units or combined into a single 10-bit switch. The series is designed for high-speed data transfer applications where signal integrity and low power consumption are critical factors in system design.

Replacement Considerations

SN74CBTD3384CDWR

FAQ

How does the device handle undershoot on the A and B ports?

The SN74CBTD3384CDWRE4 features active undershoot-protection circuitry that senses undershoot events and ensures the switch remains in the proper OFF state, providing protection up to -2 V.

What is the purpose of the integrated diode to VCC?

The integrated diode to VCC provides level shifting capability, allowing the device to accept 5-V inputs and shift them down to 3.3-V output levels.