SN74CB3Q16811DL

Overview

The SN74CB3Q16811DL is a 24-bit FET bus switch from the Widebus family, organized as two independent 12-bit switches. It operates within a supply voltage range of 2.3 V to 3.6 V and supports data I/O levels from 0 V to 5.5 V. The device features low on-state resistance (typical 5 Ω) and utilizes a charge pump for gate elevation. B-port outputs are precharged via a bias voltage (BIASV) to minimize signal distortion during live insertion. It includes Ioff support for partial-power-down modes and undershoot clamp diodes on control inputs.

Feature Summary

• Precharged B-port outputs reduce signal distortion during hot-plugging events
• Bidirectional data flow with near-zero propagation delay
• Ioff circuitry prevents damaging current backflow when powered down
• Low input/output capacitance minimizes loading effects

Applications

• PCI hot plug applications
• Hot docking systems
• Memory interleaving
• Bus isolation circuits

Procurement Notes

Verify the DL suffix corresponds to the SSOP package configuration before procurement. Confirm that the specific revision level matches the design requirements. Ensure the ordering quantity aligns with standard tube packaging specifications provided by the manufacturer. Cross-reference the part number against the latest availability status to confirm production readiness.

Selection Notes

Select this component for high-bandwidth interfaces requiring rail-to-rail switching capabilities. The integrated charge pump ensures flat on-state resistance across the operating voltage range. Consider the separate output-enable inputs for managing distinct 12-bit segments independently. Evaluate the thermal impedance characteristics relative to the system's heat dissipation constraints.

Part Context

This device belongs to the Texas Instruments Widebus family of low-voltage FET bus switches. It is designed to provide optimized interface solutions for broadband communications and data-intensive computing systems. The architecture supports both digital and analog signal gating with minimal distortion.

Replacement Considerations

SN74CB3Q16811DGGR

FAQ

How does the device handle live insertion noise?

The B-port outputs are precharged to a bias voltage (BIASV) equal to the receiver input threshold, preventing glitches from crossing the threshold region during card insertion or removal.

What is the function of the Ioff circuit?

The Ioff circuitry disables outputs when the device is powered down, preventing damaging current backflow through the device in partial-power-down applications.