CBTU02044HEJ

Overview

The CBTU02044 is a high-speed differential 1-to-2 switch optimized for PCIe Gen4 interfaces in server and client applications. It supports two differential channels with a 3 dB bandwidth of 17 GHz, low insertion loss (0.56 dB at 100 MHz), and off-state isolation of -70 dB at 100 MHz. The device operates on a VDD supply voltage range of 1.62 V to 3.63 V, consuming 200 μA in active mode and 3 μA in power-saving mode. It features rail-to-rail input support up to 2.4 V, back current protection, and an ESD rating of 2000 V HBM. Packaged in a HUQFN16 footprint measuring 1.6 mm x 2.4 mm x 0.5 mm, it functions as both a 1-to-2 switch and a 2-to-1 MUX.

Feature Summary

• Optimized signal integrity for stringent crosstalk requirements at higher data rates
• Dual-differential channel architecture supporting 1-to-2 switching and 2-to-1 multiplexing
• Low power consumption with dedicated shutdown functionality minimizing current draw
• Robust protection including back current protection on all I/O pins

Applications

• PCIe Gen4 interface switching for servers and clients
• MIPI interface routing
• DisplayPort 1.4 signal switching
• DDR memory interface multiplexing

Procurement Notes

Verify the specific ordering suffix HEJ corresponds to the required reel packing method and standard marking configuration. Confirm that the HUQFN16 package dimensions align with the PCB footprint design guidelines provided in the datasheet. Ensure environmental operating conditions meet the specified temperature range of -40 °C to +85 °C for the target application environment.

Selection Notes

Select this component when designing high-speed differential signal paths requiring minimal insertion loss and strict crosstalk control. The integrated shutdown pin allows for efficient power management in battery-operated or energy-sensitive systems. Verify compatibility with the host controller's GPIO levels for SEL and XSD control signals before finalizing the schematic design.

Part Context

This part belongs to NXP's portfolio of high-speed analog switches designed for modern computing infrastructure. It addresses the increasing bandwidth demands of next-generation interconnects like PCIe Gen4. The device integrates advanced analog pass-gate technology to maintain signal fidelity across wide frequency ranges while occupying minimal board real estate.

Replacement Considerations

No direct public substitute part numbers are documented in the official datasheet. Designers should evaluate other NXP high-speed switches based on matching pinout compatibility, electrical specifications, and package dimensions if replacement is necessary.

FAQ

How does the CBTU02044 handle power-down states?

The device enters a high-impedance state with minimized supply current consumption when the XSD pin is driven HIGH. When XSD is LOW, the device operates normally.

What is the maximum input voltage supported by the switch ports?

All channels support rail-to-rail input voltages up to 2.4 V, allowing compatibility with various logic levels without external level shifting.

Can the CBTU02044 function as a multiplexer?

Yes, it can operate as a 2-to-1 MUX by selecting Port A as the output from either Port B or Port C, controlled via the SEL pin.