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regarding TL16C752B

Dear Sir,

I am using TL16C752B (DUAL UART) for rs232 and rs422 communication. In TL16C752B Ic i am not using CDA, CDB ,CTSA, CTSB , DSRA, DSRB, RTSA, RTSB etc pins..

I want to know wat can i do for these pins.shall i left as unconnected or shall i pull up or pull down these pins.

Please suggest me.

 

 

Regards,

Amit Kumar