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SN74LVC1G123: How does Rexr, Cext, RL and CL included in the calculation of pulse duration ?

Part Number: SN74LVC1G123


Is the below diagram correctly interpreted ?

  • If RL and CL are involved in the calculation, how does the calculation?
    • If t= K x Cext x Rext  = 1.11 x 28pF x 2kohm = ~62ns . It is not match with the reading below , which is 170-200ns.

    How does it related to Figure 9 in datasheet?