DS125DF111: How to design the PRBS generator function on the circuit

Dear Sir/Madam,

We want to use the PRBS generator function for the following requirements, could you help us check which component we should select: DS125DF111, DS123DF410, or DS110DF410?
• Data-Rate(Tx): ~3Gbps.
• Rise/Fall: 30ps(Min) and 42ps(Max)
• P-P Swing: 0.2V - 0.45V
• PRBS Generator: PRBS7

We plan to generate PRBS signal from the re-timer's Tx pin to our device. However, we are unsure whether the Rx pin in the circuit can be left floating or what clock signal should be input to the Rx pin. Could you provide guidance on this?

Thank you.