SN74CBT3383CDBQR

Overview

The SN74CBT3383CDBQR is a high-speed TTL-compatible FET bus-exchange switch manufactured by Texas Instruments. It provides ten bidirectional data paths with low on-state resistance and near-zero propagation delay. The device supports a VCC operating range of 4 V to 5.5 V, enabling data I/O signaling levels from 0 V to 5 V. It features active undershoot protection up to -2 V on A and B ports, ensuring proper isolation during off states. The component operates within an ambient temperature range of -40°C to +85°C.

Feature Summary

• Active undershoot-protection circuitry on A and B ports ensures the switch remains in the correct OFF state during undershoot events up to -2 V.
• Bus exchange functionality allows for nibble swapping or byte swapping of buses using the BX select input without adding significant propagation delay.
• Supports partial-power-down mode operation via the Ioff feature, preventing damaging backflow currents when the device is powered down.
• Low input/output capacitance minimizes signal loading and distortion while maintaining high-speed bidirectional data flow.

Applications

• Enterprise servers
• Ethernet switches
• Routers
• Industrial PCs

Procurement Notes

Verify that the specific ordering suffix matches the required package type, as the SN74CBT3383C family includes DBQ (SSOP), DW (SOIC), and PW (TSSOP) variants. Confirm the presence of the 'C' designation in the part number, which indicates the inclusion of active undershoot protection not found in all base models. Ensure compatibility with the target PCB footprint and reflow profile specifications provided in the manufacturer's package addendum.

Selection Notes

Select this component when system design requires simultaneous multiplexing of multiple channels in a 2:1 configuration or when byte-swapping capabilities are necessary. The device is suitable for applications needing low on-state resistance to minimize ground bounce noise. Verify that control inputs can be driven by TTL or 5-V/3.3-V CMOS outputs to ensure proper logic level interfacing across the specified voltage range.

Part Context

This device belongs to the SN74CBT3383C series of high-speed CMOS bus switches. It is designed to replace mechanical relays or slower switching technologies in digital and analog applications. The component integrates ten independent FET switches into a single package, providing a compact solution for bus isolation, memory interleaving, and low-distortion signal gating in high-density electronic systems.

Replacement Considerations

SN74CBT3383CDBQRE4