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CCS/UCD3138: UCD3138 I2C the total capacitance of one bus line

Part Number: UCD3138

Tool/software: Code Composer Studio

Hello:

Recently I found in ucd3138_Data Manual , Table 5-1 PMBus part, The Cb  (the total capacitance of one bus line)  maxima is about 400PF.

It  confuse me .

i want to confirm that the total capacitance of one bus line it means UCD3138  I2C  driving ability  is about 400pF?

Or it means the Input Capacitance of  UCD3138 I2C pin or inner circuit is about 400pF?

Thank you very much!