General description
CBTU02044 is a high-speed differential 1-to-2 switching chip optimized to interface
with PCIe4.0 for server and client applications. This high performance switch chip could
be used for other high-speed interfaces such as PCIe-Gen4, MIPI, DP1.4, and DDR.
CBTU02044 also functions as a 2-to-1 MUX by selecting 1 (Port A) as output out of one
of the two differential ports (either Port B or C).
Pinouts are optimized for minimum number of layout layers and for achievement of very
low crosstalk to meet stringent crosstalk requirements at higher data rate. CBTU02044 is
a small package with optimized footprint for smaller real estate occupancy.
CBTU02044 is available in 1.6 mm x 2.4 mm x 0.5 mm HUQFN16 package with 0.4 mm
pitch.

Features and benefits
• Optimized high-speed signal integrity
• Minimize crosstalk to meet stringent PCIe4.0 requirement
• Two-differential channels 1-to-2 switch/2-to-1 mux
– Low insertion loss (typ): 0.56 dB at 100 MHz; 1.1 dB at 5 GHz; 1.5 dB at 8 GHz
– Low off-state isolation: -70 dB at 100 MHz, -23 dB at 5 GHz, -18 dB at 8 GHz
– Low return loss (typ): 21 dB at 2.5 GHz; 18 dB at 5 GHz; 15 dB at 8 GHz
– Low ON-state resistance: 10 Ω (typ)
– 3 dB bandwidth (typ): 17 GHz (typ)
– DDNEXT < -50 dB @ 8 GHz
– DDFEXT < -48 dB @ 8 GHz
– VIC common mode input voltage VIC: 0 V to 2 V
– Differential input voltage VID <1.6 V
– Intra-pair skew <4 ps
• VDD power supply voltage range: 1.62 V to 3.63 V
• Low current consumption:
– For active mode = 200 μA (typ)
– For power-saving = 3 μA (typ)
• CMOS SEL and XSD pins
• Back current protection on all I/O pins of these switches
• Patent pending high performance analog pass-gate technology
• All channels support rail-to-rail input voltage (up to 2.4 V)
• HUQFN16 1.6 mm × 2.4 mm × 0.5 mm package with 0.4 mm pitch
• ESD: 2000 V HBM; 1000 V CDM
• Operating temperature range: -40 °C to +85 °C