The SN65LVCP40 is a signal conditioner and data multiplexer optimized for backplanes. Input equalization and programmable output preemphasis support data rates up to 4 Gbps. Common applications are redundancy switching, signal buffering, or performance improvements on legacy backplane hardware. The SN65LVCP40 combines a pair of 1:2 buffers with a pair of 2:1 multiplexers (mux). Selectable switch-side loopback supports system testing. System interconnects and serial backplane applications of up to 4 Gbps are supported. Each of the two independent channels consists of a transmitter with a fan-out of two, and a receiver with a 2:1 input multiplexer. The drivers provide four selectable levels of preemphasis to compensate for transmission line losses. The receivers incorporates receive equalization and compensates for input transmission line loss. This minimizes deterministic jitter in the link. The equalization is optimized to compensate for a FR-4 backplane trace with 5-dB, high-frequency loss between 375 MHz and 1.875 GHz. This corresponds to a 24-inch long FR-4 trace with 6-mil trace width. This device operates from a single 3.3-V supply. The device has integrated 100- line termination and provides self-biasing. The input tolerates most differential signaling levels such as LVDS, LVPECL or CML. The output impedance matches 100- line impedance. The inputs and outputs may be ac coupled for best interconnectivity with other devices such as SERDES I/O or additional XAUI multiplexer buffer. With ac coupling, jitter is the lowest. The SN65LVCP40 is packaged in a 7 mm × 7 mm × 1 mm QFN (quad flatpack no-lead) lead-free package, and is characterized for operation from -40°C to 85°C.