SN74CBTD3384CDBR

Overview

The SN74CBTD3384CDBR is a high-speed TTL-compatible FET bus switch manufactured by Texas Instruments. It features an SSOP-24 package and operates within a supply voltage range of 4.5 V to 5.5 V. The device provides low ON-state resistance with a maximum value of 20 Ohms and a typical propagation delay of 150 ps. It supports bidirectional data flow and includes active undershoot protection for off-isolation on A and B ports up to -2 V. The component is designed for partial-power-down applications using Ioff support.

Feature Summary

• Integrated diode to VCC enables level shifting from 5-V input down to 3.3-V output levels
• Active undershoot-protection circuitry ensures proper OFF state during signal anomalies
• Ioff feature prevents damaging backflow current when the device is in partial-power-down mode

Applications

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

Procurement Notes

Verify the specific ordering suffix 'DBR' corresponds to the SSOP-24 tape and reel packaging configuration. Confirm that the lead finish is NIPDAU as indicated in the manufacturer's package option addendum. Ensure the operating temperature range meets the system requirements of -40°C to +85°C before finalizing procurement specifications.

Selection Notes

Select this component when a high-speed, low-resistance bus switch is required for 5-V systems. The integrated level-shifting capability makes it suitable for interfacing 5-V inputs with lower voltage domains. Verify that the control inputs can be driven by standard TTL or CMOS outputs to ensure compatibility with the host logic family.

Part Context

This part belongs to the SN74CBTD3384C series of digital bus switches. It is organized as two independent 5-bit bus switches, which can function as separate channels or combine into a single 10-bit switch. The device utilizes FET technology to achieve minimal propagation delay and low loading effects on the switched signals.

Replacement Considerations

SN74CBTD3384CDWR (SOIC-24 variant)

FAQ

How does the device handle undershoot events?

The SN74CBTD3384CDBR features 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 allows the device to support partial-power-down mode by ensuring that no damaging current flows back through the device when it is powered down but the system bus is active.