SN74CB3Q16211ZQLR

Overview

The SN74CB3Q16211ZQLR is a high-bandwidth FET bus switch from the Widebus family, organized as two independent 12-bit switches or one 24-bit switch. It utilizes an internal charge pump to elevate gate voltage, ensuring low and flat ON-state resistance (ron) for minimal propagation delay and rail-to-rail switching on data I/O ports. The device supports bidirectional data flow with near-zero propagation delay and features low input/output capacitance to minimize loading and signal distortion.

Feature Summary

• Utilizes a charge pump mechanism to provide low and flat ON-state resistance characteristics across the operating range.
• Supports rail-to-rail switching on data I/O ports, accommodating 0-V to 5-V signaling levels while powered by 2.3 V to 3.6 V.
• Features dedicated Ioff circuitry to prevent damaging current backflow during partial-power-down mode operation.
• Includes undershoot clamp diodes on data and control inputs to enhance signal integrity.

Applications

• PCI Interface
• Differential Signal Interface
• Memory Interleaving
• Bus Isolation
• Low-Distortion Signal Gating

Procurement Notes

Verify that the specific suffix ZQLR corresponds to the Microstar Junior package configuration documented in the official datasheet ordering information. Confirm that the component meets the required RoHS compliance standards and operates within the specified -40°C to 85°C temperature range. Ensure design compatibility with the 56-pin VFBGA footprint and validate electrical parameters against the recommended operating conditions provided by Texas Instruments.

Selection Notes

Select this component for applications requiring high-bandwidth data paths up to 500 MHz. The device is suitable for broadband communications, networking, and data-intensive computing systems where low capacitive loading and fast switching frequencies are critical. Consider the separate output-enable inputs for flexible bus management and the 5-V tolerant I/O capability for interfacing with various logic families.

Part Context

This part belongs to the SN74CB3Q16211 series within the Widebus family of high-performance FET bus switches. The ZQLR suffix indicates the specific tape-and-reel packaging variant housed in a 56-pin VFBGA (Microstar Junior) package. It shares functional similarities with other CB3Q devices but is optimized for high-speed digital and analog signal switching applications.

Replacement Considerations

SN74CB3Q16211DGGR

FAQ

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

The device includes Ioff circuitry that prevents damaging current backflow through the device when it is powered down, supporting partial-power-down mode operation.

What is the maximum switching frequency for the control input?

The maximum switching frequency for the OE control input is 20 MHz under specified test conditions.