In a circuit using a high-speed IC coupler, how should output pull-up resistance be selected?

Also refer to Toshiba Application Note "Basic Characteristics and Application Circuit Design of IC Couplers", section 2.3.4 Typical applied design, (3) Pull-up resistance RL.
(https://toshiba.semicon-storage.com/ap-en/semiconductor/knowledge/application-note.html)

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