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TB5T1: How to deal with the unused channel in TB5T1

Part Number: TB5T1

Hi team,

My customer is using our TB5T1. As you know that the TB5T1 has dual channels driver and dual channels receiver. But my customer only uses one channel driver and one channel receiver. How should we deal with the pins of the unused channels? Left open or connect to a certain level?

For example,

if we don't use 2# channel driver, how should we deal with DI2, DO2 and /DO2? 

if we don't use 2# channel receiver, how should we deal with RI2, /RI2 and RO2?

Best regards,

Wayne