SN65HVD3082E: the resistance of pin A&B

In theory, all devices should behave pretty much the same.

How exactly was the resistance measured? The parameter that is guaranteed is the bus input current (I_I); is it inside the limits?

What are the problems?

Were the devices bought from an authorized distributor, or is it possible that they might be counterfeit?

Zoe,

How are they measuring the impedance - is it between A and B? If so - there is no spec and we don't guarantee any specific value - so when bringing up an issue its very helpful to understand if there is a published datasheet spec violation or the application is failing - and how it is failing and please keep in mind that : failure of a spec we don't specify isn't a failure to TI and if there are functional problems explaining what is wrong -what's actually failing and keep in mind if the fail is an automated test of the device set up with specifications that we don't guarantee - we won't call that a fail either. 

That being said - I suspect you have two versions of this device - as there are more than 1 version as we changed the die about 2 years ago - so its possible to still have old/new material mixed. We have noticed on other devices that have gone through this design change will have different impedance values - we don't spec this however so we don't guarantee the levels that they are measured at. Also we have yet to see an issue where this difference in impedance caused application failure - but we have seen them fail customer specific automated tests on parameters that we don't actually guarantee. 

So if you could please:

1. Send me a picture of the top of both a higher and lower impedance unit (so I can see part markings clearly). This is so I can confirm that the parts are legitimate.

2. If there are functional / application failures please provide the following details:

a) Schematic

b) Description of failure - is it a communication failure; if so what are the symptoms of failure and what pins? (scope shots would be very helpful here)

This will allow me to double check if there is another problem as well and hopefully look a little deeper into their fail to see what solutions/remedies may be needed. 

Best,

Parker Dodson 

Hi Parker,

Thanks for your reply!

Do u have the exact time that we changed the die?

my customer find that the 43M one is packaged in 2021.09 and another one is in 2021.12.

PCN# 20210811000.1, but the old and new fabs have been working in parallel.

Hi Zoey,

The units with the new die  should have started shipping in November of 2021. The PCN # that Clemens is referencing is the correct the PCN number for this change. 

I can verify both parts if you can show me the top markings of each unit - but I do think its most likely the change in die.

Best,

Parker Dodson

Hi  Parker,

Add the marking: