SN74CB3Q16211DLR

Overview

The SN74CB3Q16211DLR is a high-bandwidth FET bus switch from the Widebus family, organized as two 12-bit switches or one 24-bit switch. It operates on a single supply voltage (VCC) ranging from 2.3 V to 3.6 V. The device utilizes a charge pump to elevate gate voltage, providing low and flat ON-state resistance (ron = 5 Ω typical). It supports bidirectional data flow with near-zero propagation delay and rail-to-rail switching capabilities for both 2.5-V and 3.3-V systems. Data I/Os are 5-V tolerant, allowing operation with various signaling levels including 0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, and 5 V.

Feature Summary

• High-bandwidth data path supporting up to 500 MHz
• Rail-to-rail switching capability across 0-V to 5-V ranges
• Low input/output capacitance minimizes signal distortion
• Integrated undershoot clamp diodes on data and control inputs

Applications

• PCI interface
• Differential signal interface
• Memory interleaving
• Bus isolation
• Low-distortion signal gating

Procurement Notes

Verify the package type matches the design requirements, as the DL suffix indicates an SSOP-56 package. Confirm that the operating temperature range of -40°C to 85°C aligns with the application environment. Ensure that the control inputs are properly biased to VCC or GND during power-up to maintain the high-impedance state. Check for RoHS compliance if required by the manufacturing process.

Selection Notes

Select this component when a high-speed, low-distortion bus switch is needed for broadband communications or data-intensive computing. It is suitable for applications requiring partial-power-down modes due to its integrated Ioff circuitry. Consider the 5-V tolerance of the I/O ports if interfacing with legacy logic levels. The dual 12-bit configuration offers flexibility in routing data buses within embedded systems.

Part Context

This device belongs to Texas Instruments' Widebus family, designed for high-performance signal switching. It complements other CB3T and CBT series switches by offering enhanced bandwidth and lower capacitance. The SN74CB3Q16211 is specifically optimized for networking and AV applications where signal integrity is critical. It shares functional similarities with the SN74CB3T16211 but includes specific enhancements for automotive and industrial reliability.

Replacement Considerations

The SN74CB3T16211DGGR is a pin-compatible alternative within the same family. Verify that the replacement part meets the specific thermal and electrical requirements of the original design.