1. General description
CBTL02042A/B is a 2 differential channel, 2-to-1 multiplexer/demultiplexer switch for PCI
Express Generation 2 (Gen2), and other high-speed serial interface applications. The
CBTL02042A/B can switch two differential signals to one of two locations. Using a unique
design technique, NXP has minimized the impedance of the switch such that the
attenuation observed through the switch is negligible, and also minimized the
channel-to-channel skew as well as channel-to-channel crosstalk, as required by the
high-speed serial interface. CBTL02042A/B allows expansion of existing high speed ports
for extremely low power.
The device's pinouts are optimized to match different application layouts. CBTL02042A
has input and output pins on the opposite of the package, and is suitable for edge
connector(s) with different signal sources on the motherboard. CBTL02042B has outputs
on both sides of the package, and the device can be placed between two connectors to
multiplex differential signals from a controller. Please refer to Section 8
for layout
examples.
2. Features and benefits
2 bidirectional differential channel, 2 : 1 multiplexer/demultiplexer
High-speed signal switching for PCIe Gen2 5 Gbit/s
High bandwidth: 7 GHz at −3dB
Low insertion loss:
−0.5 dB at 100 MHz
−1.2 dB at 2.5 GHz
Low intra-pair skew: 5 ps typical
Low inter-pair skew: 35 ps maximum
Low crosstalk: −30 dB at 2.5 GHz
Low off-state isolation: −25 dB at 2.5 GHz
Low return loss: −20 dB at 2.5 GHz
V
DD
operating range: 3.3 V ± 10 %
Shutdown pin (XSD) for power-saving mode
Standby current less than 1 μA
ESD tolerance:
8kV HBM
1 kV CDM
DHVQFN20 package
CBTL02042A; CBTL02042B
3.3 V, 2 differential channel, 2 : 1 multiplexer/demultiplexer
switch for PCI Express Gen2
Rev. 1 — 10 March 2011 Product data sheet
