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ISO7741: Signaling rate and delay

Part Number: ISO7741

Hi Expert,

Is there any relationship between propagation delay and signaling rate for ISO77xx and ISO724xM?

In the datasheet, ISO77xx has MAX 16ns propagation delay and support 100Mbps; ISO724xM has 23ns propagation delay and support 150Mbps. 

From datasheet, the only parameter which has impact is PWD. How can I interpret delay and signaling rate better?