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TL331: Maximum input current specification

Part Number: TL331


can you confirm that the "input bias current" (Iib) in the datasheet specifies the maximum current that the device can draw?
(-400nA over full temp range)

My customer needs conformation that this is the critical value for their design and that the device does not draw too much current from their input side.
They are using TL331IDBVRE4.