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GD75232: GD75232 output signal issue when power ON

Part Number: GD75232
Other Parts Discussed in Thread: GD65232

Dear all:

     My customer use GD75232 of their RS232 port ,they feedback an issue. attached is circuit.

     Power sequency follow  VDD-VSS-VCC-VIO(-12V to 12V  to 5V),  when +12 power on, Output PIN have a pulse  up to 3V, and then down to

    -12V(normal voltage)  before signal input. we have a  doubt that is it  normal for this IC?  How can we  eliminate the pulse?  please help to check,