TCA9517: Looking for 1.8V operation in IBIS model

Hi Ben,

Thanks for reaching out. As of right now I don't see anything in progress that would directly relate to the 2020 post you linked. It will take me about a week to track down this in more detail if there is any, as the engineers connected to that thread are out until that time.

Due to current load, I can't guarantee that our team would be able to get an edited version of this model out by a specific deadline. We will however follow up here after looking into this a bit more.

Best,

Danny

Hi Danny,

First of all, I would like to thank you for your help

Also, I saw this passage after the link attached to Ben

"[Bobby] For now, can you use TCA9509 as a temporary substitute while we work on generating the IBIS model?"

Can you help me confirm that this is feasible?

And let me explain the problems I have with the TCA9517

First ,TCA9517 IBIS model includes  0.9V, 3.3V, and 5V opreation on side A only.

But 1.8V operation is used in our design.

Second,TCA9517 IBIS model doesnt have series model.

could you help me to fix this issue?

Thanks

Tommy

Tommy,

We are working on expanding our modeling portfolio. I will have more information about our upcoming models (including series) next week.

Regarding your question about the TCA9509 model, the B-side of the TCA9509 should be representative of the A-side of the TCA9517.

Best,

Danny

Hi Danny,

Thank you for your help

First I want to ask how is it about tca9517?

And there is question about the TCA9509 model,

That’s means I can use tca9509 to replace it for now, but I need to turn over the A side and B side?

Thanks

Tommy

Hi Tommy,

There has been no progress to the e2e ticket for the IBIS models. 

For TCA9509, The B side of that device should behave similarly with that of A side of TCA9517.

The B side of TCA9517 doesn't behave like the A side of TCA9509 however.

-Bobby

Hi Bobby,

Thank you for your help

After discussion," For TCA9509, The B side of that device should behave similarly with that of A side of TCA9517".

we do some change on TCA9517

There is the IBIS model , could you please help me see if this is appropriate?

tca9517_wi_TCA9509_B_side.ibs

Thanks

Hi Tommy,

Can you tell me what you modified? I assume you took the net lists from the 9509 B side and swapped them into the TCA9517 A side I/.O model.

-Bobby

Hi Bobby,

sorry to disturb you again

I'm afraid of some misunderstanding between us

I want to share my Hyperlynx file and tca9517.ibs to you 

do you guys have  Hyperlynx lincense?

0842.tca9517_wi_TCA9509_B_side.ibs

the different side we set is we change the A side like picture below

but it still can't work , there is the circuit i set

tca9517_set.ffs.ibs

add another point : when you use this file , please delete the file name .IBS first.

please help me check it is right or not.

and now we are suggest another way

We think this part does not have a series model because the voltages of his A SIDE and B SIDE are separated (as shown below).

For example, the current VCC A is 1.8V, while VCC B is 3.3V, and the two are not affected by each other (there is no SERIES MODEL),

Taking PIN2 to PIN7 as an example, I can start measuring directly from PIN7, so that I can avoid the problem that A SIDE does not have 1.8V operation.

Would you like to ask if this understanding is correct?

if there have any idea, please share with me

thanks

Tommy

Hi Bobby,

sorry to disturb you again

If you have any suggestion

please setup properly to our schematics that I sent you

thanks 

Tommy

Tommy Tuu said:

I want to share my Hyperlynx file and tca9517.ibs to you 

do you guys have  Hyperlynx lincense?

I'll need to double check. In the past, we've used hyperlynx but I recall we may have changed the way we handle our licensing and may have moved to a different IBIS model simulator.

Tommy Tuu said:

We think this part does not have a series model because the voltages of his A SIDE and B SIDE are separated (as shown below).

For example, the current VCC A is 1.8V, while VCC B is 3.3V, and the two are not affected by each other (there is no SERIES MODEL),

Taking PIN2 to PIN7 as an example, I can start measuring directly from PIN7, so that I can avoid the problem that A SIDE does not have 1.8V operation.

Would you like to ask if this understanding is correct?

You're correct. This device is a redriver, it does not have a pass FET architecture so there should not be a series model for the device. The IBIS simulation tool should treat this device as some kind of push pull driver on A side assuming you pulled the TCA9509 structure and then treat the B side as some kind of open drain driver.

-Bobby

Hi Tommy,

I took a look at our Hyperlynx software but it seems like the tool we use also shows a IBIS editor and doesn't seem to have a schematic build to test with. The ADS Keysight tool we have does have a schematic builder for IBIS but I'm only seeing input models for the A side of the model you provided. Below is the Input model with a digital output. The digital output seems to behave as expected, it's no open drain but rather push pull.

The only other model that I can find using ADS Keysight is the IO-OSNK model which is what I would expect however it seems to only show the B side and not the A side.

Do you have access to the IO_OSNK model in the tool your using for A side?

-Bobby