SN65LVDM176: IBIS model for SN65LVDM176 shows delay and glitches

Fernando Diaz

Part Number: SN65LVDM176

When using Hyperlynx, the IBIS model for SN65LVDM176 show excessive glitching and considerable delay under a simplistic setup. Other vendors of exact function type show expected response.
I am attaching two simulation scope plots, one at 100 MHz and the other for rising edge simulation. Observe TI component response against counterpart vendor clean waveform
Red waveform is TI SN65LVDM176
Is this a TI IBS model issue or is that how the part behaves in real applications? Please elaborate at your earliest
As additional notes, Hypelynx model editor error checker show the info below if it helps:

WARNING - Model DRVR_IN_RCVR_EN: POWER Clamp : Typical value never becomes zero
NOTE (line 763) - Pullup Typical data is non-monotonic
NOTE - Combined Pullup for Model: RECEIVER_OUT Typical data is non-monotonic based on piece-wise linear interpolation
CAUTION - [Ramp] dV ( 1.740V) not within 5.00% of I-V table dV ( 1.980V) calculation: Model RECEIVER_OUT: Process: TYP: (Rising)
CAUTION - [Ramp] dV ( 1.740V) not within 5.00% of I-V table dV ( 1.980V) calculation: Model RECEIVER_OUT: Process: TYP: (Falling)
CAUTION - [Ramp] dV ( 0.314V) not within 5.00% of I-V table dV ( 0.200V) calculation: Model REC/DRVR_BI: Process: TYP: (Rising)
CAUTION - [Ramp] dV ( 0.443V) not within 5.00% of I-V table dV ( 0.319V) calculation: Model REC/DRVR_BI: Process: TYP: (Falling)
WARNING - Model RECEIVER_IN not referenced in any [Pin], [Model Selector], [Driver Schedule] or [Series Pin Mapping] sections.
No more warnings will be generated for un-referenced models

Errors : 0
Warnings: 2
Cautions: 4

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over 2 years ago

0 Joshua Salinas over 2 years ago

TI__Mastermind 22400 points

Hello Fernando,

Thanks for your question. We are looking into this. Please give us until early next week for an update. Thank you!

Regards,

Josh

0 Joshua Salinas over 2 years ago

TI__Mastermind 22400 points

Hello Fernando,

Thanks for you patience and apologize for the delay.

Upon review this IBIS model is missing key Ramp waveforms (Rising and Falling) and has inaccurate data points resulting in simulation plots similar to the one shown above. I've pinned our design team to look into a remodel for this device.

Regards,

Josh

0 Fernando Diaz over 2 years ago in reply to Joshua Salinas

Prodigy 30 points

Hi Josh,

- Any progress on this matter, it's been a while since i last heard from your team. Thanks in advance

0 Joshua Salinas over 2 years ago in reply to Fernando Diaz

TI__Mastermind 22400 points

Hello Fernando,

Thanks for you patience. Unfortunately, we don't have any current plans in releasing an IBIS remodel for this device.

Regards,

Josh

0 Fernando Diaz over 2 years ago in reply to Joshua Salinas

Prodigy 30 points

How disappointing TI team reaction to a problem like this. I wish I could talk to a higher level response

Very respectfully, I would like to ask to at least to have the decency to remove the model or put a note that the model is useless. That was a total waste of time for me, again very disappointed

0 Joshua Salinas over 2 years ago in reply to Fernando Diaz

TI__Mastermind 22400 points

Hello Fernando,

I understand your frustration with this. Our design team is using all of their bandwidth to release new device IBIS models that are properly tested and meet customer expectations. This device IBIS model was released +20 years ago and it seems we miss software errors that occur in such devices. I have pinned this IBIS model to our design team for a remodel.

Again, I apologize for the frustration and inconvenience this has brought. Please allow us to make this right.

Sincerely,

Josh

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SN65LVDM176: IBIS model for SN65LVDM176 shows delay and glitches