SN74CBT3345CPW

Overview

The SN74CBT3345CPW is an 8-bit FET bus switch in a 20-pin TSSOP package. It operates with a supply voltage range of 4 V to 5.5 V and supports bidirectional data flow between A and B ports. The device features low ON-state resistance (typical 3 Ω, maximum 12 Ω) and near-zero propagation delay (maximum 0.24 ns). It includes active undershoot protection up to -2 V on I/O ports and supports partial-power-down mode via the Ioff feature.

Feature Summary

• Active undershoot-protection circuitry ensures proper OFF state during signal undershoot events up to -2 V.
• Supports partial-power-down applications by preventing damaging backflow current when powered down.
• Provides bidirectional data flow with minimal propagation delay due to low ON-state resistance.

Applications

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

Procurement Notes

Verify the specific ordering suffix 'PW' corresponds to the tube packaging format for the TSSOP-20 variant. Confirm that the component meets RoHS compliance standards as indicated in the manufacturer's documentation. Ensure control inputs are properly biased to VCC or GND to maintain stable operation.

Selection Notes

Select this component for high-speed digital and analog applications requiring low signal distortion. The wide input/output voltage support allows compatibility with various signaling levels from 0.8 V to 5 V. The TTL-compatible control inputs facilitate easy integration with standard logic families.

Part Context

This device belongs to the SN74CBT3345C series of high-speed TTL-compatible FET bus switches. It is designed to provide efficient signal routing with minimal loading effects. The family offers multiple package options including SOIC, SSOP, and QFN variants to suit different board space requirements.

Replacement Considerations

SN74CBT3345CDWR

FAQ

How does the device handle undershoot events?

The SN74CBT3345CPW includes active undershoot-protection circuitry on the A and B ports that senses undershoot events and maintains the switch in the correct OFF state for voltages down to -2 V.

What is the function of the Ioff feature?

The Ioff feature ensures that no damaging current flows through the device when it is in a partial-power-down state, providing effective isolation during power-off conditions.