RS422 / DS26LV31T / DS26LV32AT / What to do with unused pins

Toshiyuki

Mastermind 7075 points

Other Parts Discussed in Thread: DS26LV32AT, DS26LV31T

Hi,

Our customer has a question about the quad RS422 driver 「DS26LV31T」 & reciever 「DS26LV32AT」.

When some drivers and receivers are not used,

What to do with unused pins ?

「DS26LV31T」unused input DI pins should be terminated to GND?
「DS26LV32AT」unused input RI(+),RI(-) can float?

Best Regards,

Kato/ Japan disty

over 12 years ago

0 John Griffith over 12 years ago

TI__Mastermind 22052 points

Kato-san,

Please take a look at the following post and let me know if you have any questions. There is a PDF document that Thomas has attached to his post that descirbes in detail, what to do and why to do it.

https://e2e.ti.com/support/interface/industrial_interface/int-industrial_interface/f/144/p/230701/810849.aspx

Thanks,

John

0 Toshiyuki over 12 years ago in reply to John Griffith

Mastermind 7075 points

Hi, John-san,

I don't connect the following URL.

https://e2e.ti.com/support/interface/industrial_interface/int-industrial_interface/f/144/p/230701/810849.aspx

Please check the cause.

Best Regards,

Kato/ Japan disty

0 Toshiyuki over 12 years ago in reply to Toshiyuki

Mastermind 7075 points

Hi, John-san,

It makes me troubled when I don't get a reply from you.

I don't connect the following URL.

https://e2e.ti.com/support/interface/industrial_interface/int-industrial_interface/f/144/p/230701/810849.aspx

Please check the cause.

Best Regards,

Kato/ Japan disty

0 John Griffith over 12 years ago in reply to Toshiyuki

TI__Mastermind 22052 points

Kato-san,

I apologize that the link did not work. Please take a look at the attached document.

Summary:

Unused driver inputs, tie high through resistor
Receivers, tie non-inverting signals high, and inverting signals low through resistors

Thanks,

John

2818.RS-422 Unused Inputs.pdf

0 Toshiyuki over 12 years ago in reply to John Griffith

Mastermind 7075 points

John-san,

Thank you for the Answer.

Best Regards,

Kato / Japan disty

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RS422 / DS26LV31T / DS26LV32AT / What to do with unused pins