SN74CBT3345CRGYR

Overview

The SN74CBT3345CRGYR is an octal bus switch manufactured by Texas Instruments, housed in a 20-pin VQFN package. It operates on a single supply voltage ranging from 4 V to 5.5 V and supports data I/O levels from 0 V to 5.5 V. The device features bidirectional data flow with near-zero propagation delay of 0.15 ns at 5 V. It includes active undershoot protection up to -2 V, low ON-state resistance (typically 3 Ω), and low input/output capacitance (5.5 pF typical). The component supports partial-power-down mode via the Ioff feature and meets JESD 78 Class II latch-up performance standards.

Feature Summary

• Active undershoot-protection circuitry ensures proper OFF state during signal dips down to -2 V
• Supports partial-power-down operation to prevent damaging backflow current when powered off
• Provides bidirectional data flow between A and B ports with minimal signal distortion

Applications

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

Procurement Notes

Verify the specific RGY package designation and tape-and-reel quantity against the manufacturer's latest ordering information. Confirm that the operating temperature range aligns with system requirements for industrial or commercial environments. Ensure control inputs are properly biased to maintain the high-impedance state during power transitions.

Selection Notes

Select this component for designs requiring high-speed switching with low insertion loss. The wide supply voltage range accommodates standard 5 V logic systems. Verify that the thermal impedance of the VQFN package suits the application's heat dissipation needs. Ensure compatibility with TTL-compatible control signals driving the OE pins.

Part Context

This device belongs to the SN74CBT3345C series of high-speed FET bus switches. It is designed for applications demanding fast switching speeds and low power consumption. The product is currently listed as active for new designs within the Texas Instruments portfolio.

Replacement Considerations

SN74CBT3245CRGYR

FAQ

How does the device handle undershoot events?

The SN74CBT3345CRGYR features active undershoot-protection circuitry on the A and B ports that senses undershoot events up to -2 V and maintains the switch in the correct OFF state.

What is the function of the Ioff feature?

The Ioff feature allows the device to be fully specified for partial-power-down applications, ensuring that no damaging current flows back through the device when it is powered down.