THVD1451: Selection request of RS485

Hi,

My customer is looking for a Precision Delay RS485 transceiver applied in 1PPS reference 1HZ clock signal in 1588 system. The chip transmission DELAY is required to be small enough. Now customer selects LTC1687, but I didn't find our products to compete the delay spec, as below. Could you help to select a proper device?

Thanks for your support.