SN74CBT3345CDWR

Overview

The SN74CBT3345CDWR is an octal bus switch manufactured by Texas Instruments, housed in a 20-pin SOIC package. It operates within a supply voltage range of 4 V to 5.5 V and supports data I/O levels from 0 V to 5 V. The device features bidirectional data flow with near-zero propagation delay, typically 0.15 ns at 5 V. It includes active undershoot protection for off-isolation on A and B ports up to -2 V. The typical ON-state resistance is 3 Ω, with a maximum of 12 Ω. Control inputs are compatible with TTL or 5-V/3.3-V CMOS outputs.

Feature Summary

• Active undershoot-protection circuitry ensures the switch remains in the proper OFF state during undershoot events up to -2 V.
• Supports partial-power-down mode operation using the Ioff feature to prevent damaging backflow current when powered down.
• Low input/output capacitance minimizes loading and signal distortion during high-speed switching operations.

Applications

• USB interface connections
• Memory interleaving circuits
• Bus isolation applications

Procurement Notes

Verify the specific ordering suffix 'DW' corresponds to the SOIC-20 tape and reel packaging configuration. Confirm that the component meets RoHS compliance standards as indicated in the manufacturer's documentation. Ensure the operating temperature range aligns with system requirements before finalizing procurement specifications.

Selection Notes

Select this component for designs requiring low ON-state resistance and minimal propagation delay. Verify control input compatibility with available logic families. Ensure adequate thermal management is considered if continuous current limits are approached. Check moisture sensitivity level ratings for appropriate storage and handling procedures.

Part Context

This part belongs to the SN74CBT3345C series of high-speed TTL-compatible FET bus switches. It is designed for applications demanding fast switching speeds and low power consumption. The device integrates eight independent bidirectional switches controlled by two output-enable inputs.

Replacement Considerations

SN74CBT3345CDW (Tube Packaging)

FAQ

How does the device handle undershoot events?

The SN74CBT3345CDWR includes active undershoot-protection circuitry on the A and B ports that senses undershoot events and ensures the switch remains in the correct OFF state up to -2 V.

What is the function of the Ioff feature?

The Ioff feature allows the device to support partial-power-down mode, ensuring that damaging current will not backflow through the device when it is powered down.