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.

The receiver section performs the serial-to-parallel conversion on the input data, synchronizing the resulting 20-bit wide parallel data to the recovered clock (Rx_CLK). It then extracts the 18 bits of data from the 20-bit wide data resulting in 18 bits of parallel data at the receive data terminals (RDx[0:17]). This results in an effective data payload of 0.9 Gbps to 2.25 Gbps (18 bits data x GTx_CLK frequency) per channel.

The transceiver provides an internal loopback capability for self-test purposes. Serial data from the serializer is passed directly to the deserializer, allowing the protocol device a functional self-check of the physical interface.

The transceiver is designed to be hot plug capable. An on-chip power-on reset circuit holds the Rx_CLK low during power up. This circuit also places the parallel side output signal terminals, DOUTTxP and DOUTTxN, into a high-impedance state during power up.

The transceiver uses a 2.5-V supply. The I/O section is 3-V compatible. With the 2.5-V supply, the transceiver is power efficient, consuming less than 1700 mW typically. The transceiver is characterized for operation from -40°C to 85°C.

• Hot Plug Protection
• Quad 1.0 to 2.5 Gigabits Per Second (Gbps) Serializer/Deserializer
• Independent Channel Operation
• 2.5-V Power Supply for Low Power Operation
• Selectable Signal Preemphasis for Serial Output
• Interfaces to Backplane, Copper Cables, or Optical Converters
• Lock Indication and Sync Mode for Fast Initialization
• 18-Bit Parallel Buses for Flexible Interface Applications
• On-Chip PLL Provides Clock Synthesis From Low-Speed Reference
• Receiver Differential Input Thresholds 200 mV Min
• Rated for Industrial Temperature Range
• Typical Power: 1700 mW at 2.5 Gbps
• Ideal for High-Speed Backplane Interconnect and Point-to-Point Data Link
• Internal Passive Receive Equalization
• Small Footprint 19 mm x 19 mm, 289-Ball PBGA Package

PowerPAD is a trademark of Texas Instruments.

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