SN74CB3Q16211GQLR

Overview

The SN74CB3Q16211GQLR is a high-bandwidth FET bus switch from the Widebus family, packaged in a VFBGA (GQL) with 56 terminals. It operates on a single supply voltage ranging from 2.3 V to 3.6 V and supports data I/O voltages up to 5.5 V. The device contains two independent 12-bit bus switches, functioning as either two 12-bit or one 24-bit switch. It features a typical ON-state resistance of 5 Ω and low input/output capacitance of 4 pF when off.

Feature Summary

• Utilizes a charge pump to elevate gate voltage for low and flat ON-state resistance across the operating range.
• Supports rail-to-rail switching on data ports, accommodating 0-V to 5-V signaling levels regardless of VCC state.
• Includes dedicated Ioff circuitry to prevent damaging current backflow during partial-power-down conditions.
• Features bidirectional data flow with near-zero propagation delay and undershoot clamp diodes on inputs.

Applications

• PCI interface connections
• Differential signal interfaces
• Memory interleaving systems
• Bus isolation circuits
• Low-distortion signal gating

Procurement Notes

Verify the GQL package designation matches the required footprint. Confirm that the 2.3 V to 3.6 V supply range aligns with system power rails. Ensure control inputs are pulled to VCC or GND to maintain proper operation. Check for RoHS compliance requirements if applicable to the manufacturing process.

Selection Notes

Select this component for applications requiring high bandwidth and minimal signal distortion. The integrated charge pump ensures consistent performance over varying load conditions. Verify that the 56-terminal VFBGA package fits the available board space. Consider the 5-V tolerant I/O capability if interfacing with legacy logic levels.

Part Context

This part belongs to Texas Instruments' Widebus family, designed for broadband communications and data-intensive computing. It serves as an optimized interface solution for networking equipment. The device replaces older bus switch technologies by offering superior speed and lower power consumption while maintaining compatibility with standard digital logic families.

Replacement Considerations

SN74CB3Q16211DGGR

FAQ

How does the device handle partial-power-down scenarios?

The SN74CB3Q16211GQLR includes Ioff circuitry that prevents damaging current backflow through the device when it is powered down but connected to active buses.

What is the maximum switching frequency for the control inputs?

The maximum switching frequency for the OE control inputs is specified at 20 MHz under recommended operating conditions.