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SN74LVC1G123: How does RL included into calculation of pulse duration ?

Part Number: SN74LVC1G123
Other Parts Discussed in Thread: CD40109B, UCC27517


The pulse duration I need to generate is 0.1us to 10us.

If 1000pF is used as  Cext  , and the RL is 1kohm to 10kohm from figure 12 in datasheet. K is 1.11 if 3.3V supply is used (from figure 4.2)


  • What is Rext ­used in this case ? tw = K x Rext X Cext  = 1.11 x Rext x 1000pF

Is it directly calculate Rext = tW / (K x Cext ) ?

  • How RL calculation involved in this case ? Is it both Rext  and RL need to involved in this calculation?