SN74CB3T3383DBQR

Overview

The SN74CB3T3383DBQR is a high-speed TTL-compatible FET bus-exchange switch manufactured by Texas Instruments. It operates within a VCC range of 2.3 V to 3.6 V and supports mixed-mode signal operation on all data I/O ports with voltage translation tracking VCC. The device provides 5-bit bus-exchange functionality with an enable (BE) input, allowing data exchange between four signal ports controlled by the select input (BX). It features low ON-state resistance (ron = 5 Ω typical), bidirectional data flow with near-zero propagation delay, and 5-V tolerant I/Os. The component includes undershoot clamp diodes for data and control inputs, ensuring compatibility with 0- to 5-V signaling levels.

Feature Summary

• Supports mixed-mode signal operation with voltage translation that tracks VCC
• Provides 5-bit bus-exchange capability with enable and select inputs
• Features 5-V tolerant I/Os compatible with powered-up or powered-down states
• Includes Ioff support for partial-power-down mode to prevent backflow current

Applications

• Level translation in mixed-voltage systems
• Memory interleaving applications
• Bus isolation circuits

Procurement Notes

Verify the specific package type and tape-and-reel specifications against the latest TI Package Option Addendum before ordering. Confirm that the DBQR suffix corresponds to the SSOP/QSOP package variant as listed in the official documentation. Ensure compliance with RoHS standards and check for any recent lifecycle status changes or alternative part numbers if availability is constrained.

Selection Notes

Select this component when designing systems requiring bidirectional data flow with minimal propagation delay and low ON-state resistance. It is suitable for applications needing voltage translation between 5-V, 3.3-V, and 2.5-V logic levels. Consider the 24-pin SSOP package constraints and ensure proper pullup resistor sizing for the BE pin to maintain high-impedance states during power transitions.

Part Context

This device belongs to the SN74CB3T3383 series of high-speed FET bus switches. It is designed for portable equipment and digital applications requiring efficient bus management. The family supports various packaging options including SOIC, TSSOP, and TVSOP, with the DBQR variant specifically utilizing the SSOP form factor for space-constrained designs.

Replacement Considerations

SN74CBTLV3383DBQR is documented as a similar replacement option.