LMK1C1102: LMK1C1102DQFR SCH Review

Lisa Xu

Intellectual 495 points

Part Number: LMK1C1102

Tool/software:

Dear TI Team:

We have LMK1C1102DQFR in our design for MDC clock Buffer

1. Could you pls review the SCH attached, Thanks

2. For MDC/MDIO bus, MDIO is open-drain design which can be find in the standard,

But Is MDC Push-pull mode or other mode? I cannot find relative description in the document.

MDC clock buffer.pdf

Best Regards

Lisa

1 month ago

0 William Pfennigwerth 1 month ago

TI__Expert 8171 points

Lisa,

We will get back to you next week.

Regards,

Will

+1 Sandra Saba 1 month ago

TI__Prodigy 160 points

Hi Lisa,

The schematic for LMK1C1102 appears connected correctly.

I am looping in the processor team to help answer your questions on the MDC/MDIO bus connections.

Regards,

Sandra

0 Lisa Xu 1 month ago in reply to Sandra Saba

Intellectual 495 points

Thanks Will, Sandra:

And this clock Buffer is 50ohm output impedance,Right?

Best

Lisa

+1 Sandra Saba 1 month ago in reply to Lisa Xu

TI__Prodigy 160 points

Hi Lisa,

Since you are using Vdd of 3.3 V the output impedance is 50 ohm. You can refer to spec on datasheet in table 7.5

LMK1C110x 1.8-V, 2.5-V, and 3.3-V LVCMOS Clock Buffer Family datasheet (Rev. D) (ti.com)

Regards,

Sandra

0 Lisa Xu 1 month ago in reply to Sandra Saba

Intellectual 495 points

Hi Sandra:

Get your point, And if you get the information of MDC, pls also share to me,Thanks

Best Regards

Lisa

0 Erik Friedel 1 month ago in reply to Lisa Xu

TI__Expert 4855 points

Hello Lisa,

Could you please share which processor is being used in the system so that we can direct the question to the proper expert.

Regards,

Erik

0 Lisa Xu 1 month ago in reply to Erik Friedel

Intellectual 495 points

Hi Erik,

Oh, This MDC is from intel CPU,Maybe I need ask our CPU team

Best Regards

Lisa

Clock & timing

Clock & timing forum

LMK1C1102: LMK1C1102DQFR SCH Review