• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 32 subscribers
  • Views 190 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

SN65LBC176-Q1: Rated and measurement specifications

Shotaro Sakai
Intellectual 2580 points
Part Number: SN65LBC176-Q1

Hello team,

If you have the below information, can you share it with me?

*SN65LBC176-Q1 is being considered as an alternative for SN65LBC1801DRQ1.

1. ESD rating

2. Temperature characteristics for VIT+, VIT- and VOH, VO (-10℃~110℃)

3. Recommended typical circuit

4. Absolute minimum rating for Vcc

5. Pin termination when R and RE are not required.

6. Pin termination when D and DE are not required.

Best regards,

Shotaro

  • 0
    TI__Mastermind 45817 points

    Hi Shotaro,

    I have to check with our internal  team on a couple of these parameters and I have noted where that is the case.

    1. I am checking with our internal team to see if we have an ESD rating on this device as we don't specify one in our datasheet.

    2. The values in the datasheet are temperature dependent 

    2a)  VIT+ is going to be a max of 200mV across temperature and this is the value you should design for.

    2b) VIT- is a min of -200mV across temperature - as stated in 2a this is the value that should be designed for.

    2c) VOH with -400uA of current is going to be a min of 2.7V across temperature with VID = 200mV.

    2d) VO can be anywhere from 0V to 6V across temp as indicated in the datasheet.

    3. Could you elaborate on what you mean here? Its a RS-485 device its typical circuit is going to similar to any other RS-485 device as the implementation is similar across RS-485 Transceivers  - is there something specific that there's a question on?

    4. Device is functional at VCC =4.75V - wouldn't recommend lower than that min voltage.

    5. A/B Bus termination stay the same - which ideally should match the cable impedance - standard states 2V across 100 Ohms for differential signals - so 100 Ohms is the typical in the standard.  For RE this needs to be held at a logic high level to disable R which will leave it high impedance and can be left floating. 

    6. A/B bus termination remains the same - For DE just ground the DE pin to disable (put high-z) the outputs - D is a do not care so you can float this pin as the driver is disabled. 

    Please let me know if you have any other questions - and If you could clarify what you mean by "typical" application that would be great - if you just want a simple implementation please let me know and how you want to implement the part and I will see what I can do. I am also checking on if we have the ESD data for this part and I am hoping to have an answer in the next 24 hours.

    Best,

    Parker Dodson

  • 0 in reply to Parker Dodson
    TI__Intellectual 2580 points

    Hi Parker-san,

    Thank you for your comments.

    For #3, I will show a typical circuit of RS485 to the customer.

    Also for #1, I am looking forward to your reply.

    Best regards,

    Shotaro

  • 0 in reply to Shotaro Sakai
    TI__Guru 65792 points

    Shotaro,

    I looked into the ESD rating for this device and we're going to have to contact our quality team for this information. Thank you for your patience.

    Regards,

    Eric Hackett 

  • +1 in reply to Eric Hackett
    TI__Guru 65792 points

    Shotaro,

    Turns out I was able to find some ESD information:

    The HBM rating is 2kV for all pins. The CDM rating is 750V for corner pins, 500V for all other pins. There is no MM rating for this device.

    Regards,

    Eric Hackett