DP83869HM: Absolute Maximum Ratings for SGMII RX DC Characteristics

user6236094

Part Number: DP83869HM
Other Parts Discussed in Thread: DP83867CS

Hi,Team

I am looking for DC and UI specification, or Mask for the DP83869HM SGMII.
I found the answer in the thread below.

https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1242254/dp83869hm-does-the-dp83869hm-sgmii-comply-with-the-cisco-standard/4717265#4717265

Please tell us more about the above SGMII DC specs.

[Question 1]
I checked the datasheet, but the SGMII_RX pins (SGMII_SIP, SGMII_SIN)
There was no mention of absolute maximum ratings.
What are the absolute maximum ratings for the DP83869HM SGMII INPUT pins (SGMII_SIP, SGMII_SIN)?

[Question 2]
Please tell me the lower and upper limits of the Vdiff input of the SGMII INPUT of the DP83869HM .
Will it be 800mV, which is the upper limit of the mask specification in the above diagram for SGMII INPUT of the DP83869HM ?
However, if it conforms to CISCO's SGMII specification, the Vi, Input Voltage range will be 675mV-1725mV,
so I think the upper limit of the mask will be (1725mV - 675mV) = +/- 1050mV.

[Question 3]
Are the DP83869HM SGMII RX eye width specifications 0.25UI and 0.55UI in the above diagram?

[Question 4]
We are connecting an AC Coupled Capacitor to the SGMII LINE.
What is the common mode voltage value for the SGMII RX lines inside the DP83867 PHY device?

over 2 years ago

0 Alvaro (Al-vuh-roe) Reyes over 2 years ago

TI__Mastermind 19621 points

Continuing on duplicated thread for the DP83867

https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1256274/dp83867cs-absolute-maximum-ratings-for-sgmii-rx-dc-characteristics

0 user6236094 over 2 years ago in reply to Alvaro (Al-vuh-roe) Reyes

Intellectual 310 points

HI,

I know the SGMII of the DP83867CS is Cisco compliant.
Also, I am asking about the SGMII absolute maximum ratings and EYE width because there is no description in CISCO's SGMII specification or the DP83867CS datasheet.

Where in the datasheet is the above mentioned?
Please answer the questions above.

＞We are Cisco compliant. Are you seeing any functional issues?
　In addition, the DP83869HM does not comply with Cisco for some output VOD.
　Is it true that they are all Cisco compliant?

DP83869HM: DP83869HM: SGMII voltage swing_2 - Interface forum - Interface - TI E2E support forums

　I am not convinced that the thread was closed without permission.

　Even though the DP83867CS and DP83869HM are different parts, do they have different absolute maximum ratings?

0 user6236094 over 2 years ago in reply to user6236094

Intellectual 310 points

HI,

Where in the datasheet is the above mentioned?
Please answer the questions above.

＞We are Cisco compliant. Are you seeing any functional issues?
　In addition, the DP83869HM does not comply with Cisco for some output VOD.
　Is it true that they are all Cisco compliant?

DP83869HM: DP83869HM: SGMII voltage swing_2 - Interface forum - Interface - TI E2E support forums

＞　I also noticed a duplicate query for the 869, I will close that one and continue here.

I am not convinced that the thread was closed without permission.

　Even though the DP83867CS and DP83869HM are different parts, do they have different absolute maximum ratings?

0 Alvaro (Al-vuh-roe) Reyes over 2 years ago in reply to user6236094

TI__Mastermind 19621 points

Hello,

I closed the other query because the 869/867 both follow the same SGMII Specs. Please find my responses below:

user6236094 said:
[Question 1]
I checked the datasheet, but the SGMII_RX pins (SGMII_SIP, SGMII_SIN)
There was no mention of absolute maximum ratings.
What are the absolute maximum ratings for the DP83869HM SGMII INPUT pins (SGMII_SIP, SGMII_SIN)?

Absolute Max is 3.6V

user6236094 said:
[Question 2]
Please tell me the lower and upper limits of the Vdiff input of the SGMII INPUT of the DP83869HM .

The lower limit is 100 mV. The upper limit is 800 mV.

user6236094 said:
[Question 3]
Are the DP83869HM SGMII RX eye width specifications 0.25UI and 0.55UI in the above diagram?

Yes. Both the 867 and 869 ensure an eye width of 0.55 UI and overall mask shape as described in the figure above.

user6236094 said:
[Question 4]
We are connecting an AC Coupled Capacitor to the SGMII LINE.
What is the common mode voltage value for the SGMII RX lines inside the DP83867 PHY device?

Because this is an AC coupled system, we do not spec this in the datasheet.

Regards,

Alvaro

0 user6236094 over 2 years ago in reply to Alvaro (Al-vuh-roe) Reyes

Intellectual 310 points

HI,Alvaro

Thank you for your reply regarding the above.
Please confirm the following points additionally.

>[Question 1]
>What are the absolute maximum ratings for the DP83869HM SGMII INPUT pins (SGMII_SIP, SGMII_SIN)?
>Absolute Max is 3.6V

Is -0.3V the correct minimum absolute maximum rating?

Best Regards,

+1 Alvaro (Al-vuh-roe) Reyes over 2 years ago in reply to user6236094

TI__Mastermind 19621 points

Hello,

Correct.

Regards,

Alvaro