DS90CR287: Difference of absolute max between DS90CR287 and DS90CR285

na na78

Part Number: DS90CR287
Other Parts Discussed in Thread: DS90CR285,

Our customer is asking why the Absolute Maximum ratings of CMOS/TTL input voltage shows different spec between DS90CR287 and DS90CR285.

DS90CR287: -0.5V to (VCC+0.3V)
DS90CR285: -0.3V to (VCC+0.3V)

Could you tell me the cause why there are these differences?

BestRegards

over 8 years ago

0 Ryan Hashimoto over 8 years ago

TI__Intellectual 1635 points

Hi,

I need to investigate this difference to determine the reason. These are similar devices, and I would expect the specification to be similar.

While I investigate, can you please let me know if your customer has a concern with the Absolute Maximum Rating of one of these devices? Is this going to cause your customer an issue in the application?

Regards,
Ryan

0 na na78 over 8 years ago in reply to Ryan Hashimoto

Guru 16770 points

Hi Ryan

Thank you for your support.

The purpose of replacement is to down the cost.
And they don't think that there is issue with this replacement.

They want to know what is attributed to this differences.

BestRegards

0 na na78 over 8 years ago in reply to na na78

Guru 16770 points

Hi Ryan

I appreciate if you could reply.

BestRegards

0 Ryan Hashimoto over 8 years ago in reply to na na78

TI__Intellectual 1635 points

Hi,

I recommend adhering to the Absolute Maximum Ratings listed in each of the respective datasheets. During my investigation, I was not able to find another supporting data to change the specifications. Please let me know if you require any further information.

Regards,
Ryan

0 na na78 over 8 years ago in reply to Ryan Hashimoto

Guru 16770 points

Hi Ryan

Thank you for your support.

I informed them and asked to follow the recommended operating range.

However, they still demand the reason why the there are differences in CMOS/TTL input.

>DS90CR287: -0.5V to (VCC+0.3V)
>DS90CR285: -0.3V to (VCC+0.3V)

They concern the impact of this replacement.
Is this difference of CMOS/TTL came from difference of internal circuit? difference of characterization process?

If these information cannot be opened unfortunately, it is OK.
Please tell me accordingly.

BestRegards

0 Ryan Hashimoto over 8 years ago in reply to na na78

TI__Intellectual 1635 points

Hi,

I am not able to find any other documentation to support changing either of the Absolute Maximum Values. I recommend that the customer follows the datasheet specification for each of the devices.

Regards,
Ryan

0 na na78 over 8 years ago in reply to Ryan Hashimoto

Guru 16770 points

Hi Ryan

OK, I understood.
Thank you for your support.

BestRegards

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DS90CR287: Difference of absolute max between DS90CR287 and DS90CR285