The TLK4250 device is a four-channel, multi-gigabit transceiver used in high-speed bidirectional point-to-point data transmission systems. The four channels in the transceiver are configured as four separate links. The transceiver supports an effective serial interface speed of 1.0 Gbps to 2.5 Gbps per channel, providing up to 2.25 Gbps of data bandwidth per channel. The primary application of the transceiver is to provide high-speed I/O data channels for point-to-point baseband data transmission over controlled impedance media of approximately 50 . The transmission media can be a printed-circuit board, copper cables, or fiber-optic cable. The maximum rate and distance of data transfer depend on the attenuation characteristics of the media and the noise coupling to the environment. The transceiver can also replace parallel data transmission architectures by providing a reduction in the number of traces, connector pins, and transmit/receive pins. Parallel data loaded into the transmitter is delivered to the receiver over a serial channel, which can be a coaxial copper cable, a controlled impedance backplane, or an optical link. The data is then reconstructed into its original parallel format. It offers significant power and cost savings over current solutions, as well as scalability for higher data rate in the future. The transceiver performs the data parallel-to-serial and serial-to-parallel conversions. The clock extraction functions as a physical layer interface device. The serial transceiver interface operates at a maximum data rate of 2.5 Gbps. Each transmitter latches 18-bit parallel data at a rate based on the supplied reference clock (GTx_CLK). The 18-bit parallel data is internally encoded into 20 bits by framing the 18-bit data with start and stop bits. The resulting 20-bit frame is then transmitted differentially at 20 times the reference clock (GTx_CLK) rate.