SN74CBT3345CDGVR

Overview

The SN74CBT3345CDGVR is an octal FET bus switch manufactured by Texas Instruments, housed in a 20-pin TVSOP (DGV) package. It operates within a supply voltage range of 4 V to 5.5 V and supports bidirectional data flow between A and B ports with near-zero propagation delay. The device features low ON-state resistance, typically 3 Ω at 4.5 V, and includes active undershoot protection on the I/O ports up to −2 V. It supports partial-power-down mode via the Ioff feature and is rated for operation from -40°C to +85°C.

Feature Summary

• Active undershoot-protection circuitry on A and B ports ensures proper OFF state during signal undershoot events.
• Supports partial-power-down applications using the Ioff feature to prevent damaging backflow current when powered down.
• Data and control inputs provide undershoot clamp diodes for enhanced signal integrity.

Applications

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

Procurement Notes

Verify the DGV package designation matches the required board layout dimensions. Confirm that the operating temperature range meets system requirements. Ensure unused control inputs are tied to VCC or GND to maintain stable operation. Check for RoHS compliance status if environmental regulations apply to the final assembly.

Selection Notes

Select this component for high-speed digital and analog applications requiring bidirectional switching. The TVSOP package offers a compact footprint suitable for space-constrained designs. Consider the typical 3 Ω ON-state resistance for minimizing signal loss. Verify compatibility with TTL and 5-V/3.3-V CMOS control logic levels.

Part Context

This part belongs to the SN74CBT3345C family of high-speed TTL-compatible FET bus switches. It shares functional characteristics with other variants in the series but differs in packaging. The DGV suffix specifically denotes the 20-lead Thin Visual Small Outline Package (TVSOP).

Replacement Considerations

SN74CBT3345CDWR

FAQ

How does the device handle undershoot on the I/O ports?

The SN74CBT3345CDGVR includes 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 support partial-power-down mode by ensuring that no damaging current flows back through the device when it is powered down.