SN74CBTD3305CPWR

Overview

The SN74CBTD3305CPWR is a dual FET bus switch with level shifting, designed for 5-V applications. It features an integrated diode in series with VCC to provide level shifting from 5-V input down to 3.3-V output levels. The device supports bidirectional data flow with near-zero propagation delay and includes active undershoot-protection circuitry on the A and B ports, ensuring protection for undershoot up to −2 V when the switch is off. It operates within a supply voltage range of 4.5 V to 5.5 V and supports data I/Os at 0 to 5-V signaling levels.

Feature Summary

• Integrated diode in series with VCC provides level shifting for 5-V input down to 3.3-V output levels
• Active undershoot-protection circuitry on A and B ports ensures protection for undershoot up to −2 V
• Bidirectional data flow capability with near-zero propagation delay characteristics
• Supports partial-power-down mode operation using Ioff feature to prevent damaging backflow current

Applications

• USB interface connections
• Memory interleaving circuits
• Bus isolation applications
• Low-distortion signal gating

Procurement Notes

Verify the specific package type (TSSOP PW) and tape-and-reel quantity against project requirements. Confirm RoHS compliance status and lead finish details via the latest TI Package Option Addendum. Ensure ordering suffix matches the desired packaging format. Check for any recent product life cycle changes or discontinuation notices before finalizing procurement plans.

Selection Notes

Select this component when level shifting between 5-V and 3.3-V domains is required alongside bus switching functionality. Consider its low ON-state resistance and low input/output capacitance for high-speed signal integrity. Evaluate the need for active undershoot protection if operating with fast edge rates or significant capacitive loads that might induce negative voltage spikes during switching events.

Part Context

This part belongs to the SN74CBTD3305C family of high-speed TTL-compatible FET bus switches. It is specifically engineered for applications requiring both switching and voltage translation capabilities. The CPWR variant denotes the TSSOP-8 package configuration, distinguishing it from other package options like SOIC available within the same functional family.

Replacement Considerations

Direct replacements include SN74CBTD3305CDR (SOIC package) or SN74CBTD3305CD (SOIC tube). Verify pinout compatibility and electrical specifications match exactly. Ensure the substitute part maintains the same level-shifting and undershoot protection features required by the design.