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SN74LVC16245A: What is the input stage internal structure

Part Number: SN74LVC16245A

Hi team,

My customer is using SN74LVC16245A as a transceiver. The direction is A—>B. But during the operation, we found channel 0 is malfunctional that B0 has 0V output when there is valid square wave signal on A0 input. And other channels are all in normal status. So I want to check with you what's the input stage internal structure so we can further analyze this issue. For example, if there is any protection diode or other protection circuit on the input stage? Thanks. 

Best regards,

Wayne