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UC3842: E/A Pull up Resistor

Steven Chen
Part Number: UC3842

E/A 輸出有標示0.5mA的電流源(U-100A/Fig.13)，請問等效的Pull up電阻為何?如何計算轉換?TKS!

Rpull-up=6V/0.5mA=12Kohm ??

PS: 因為要計算推導轉移函數用。(E/A Disable，Pin2下地，Pin1直接連接電容與Photocoupler並聯至地)