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SN65HVD75: input voltage tolerance

Part Number: SN65HVD75
Other Parts Discussed in Thread: SN65HVD11,

Hi,

I am planning to use SN65HVD75DRBT in my design.The R,D,RE,DE signals are from external chip and those are 5V level. I see in the SN65HVD75DRBT datasheet claiming "5-V Tolerant Logic Inputs Compatible With 5-V Controllers". But the Recommended Operating Conditions suggests the high level input shall be maximum VCC, which is 3.3V in my design. Can you confirm that I can provide 5V inputs to SN65HVD75DRBT chip without affecting device reliability and 5 years of product life?

thanks, Shanoj

  • Shanoj,

    Yes, these pins you mentioned can be connected to the 5V logic. If you check the data sheet, the abs max ratings of these pins (section 7.1, page 5) are listed from -0.3V to 5.7V. Please let me know if you have more questions.

    Regards,

    Hao

  • Hao,

    Thanks for the reply. I was wondering why recommended input level is mentioned is VCC (3.3V) , and if 5V input is limited for a short duration. What I understood from your reply is, 5V can be directly applied always. I have one more thing to clarify, that SN65HVD75DRBT is used at one end and other end is SN65HVD11DR and the communication is in RS485 half duplex mode. Please let me know these ICs can be interfaced each other, this way.

    regards, shanoj

  • Shanoj,

    Yes, SN65HVD75 and SN65HVD11 can work together in half-duplex mode, since both are complied with RS-485 standard. In many applications, even 5V and 3.3V RS-485 transceivers can interface with each other. Please let me know if you have more questions.

    Regards,

    Hao