XIO2001: 6.8 PCI Express Differential Reference Clock Input Range : VRX-DIFFp-p

user6213590

Part Number: XIO2001

Hello.
According to the XIO2001 datasheet, the Vrx-DIFF-p-p MAX voltage is 1.2 V.
Is there any risk if the voltage is over than 1.2 V?
The Vrx-DIFF-p-p MAX voltage of a board made by our company is about 1.5 V.

The COMMENTS says 「VRX-DIFFp-p = 2*|VREFCLK+ – VREFCLK-|」
The PCIe standard says that the maximum voltage of Absolute max input voltage (single-end) is +1.15 V.
Why doesn't VRX-DIFFp-p = 2.3 V?

Best Regards
Jungo

over 2 years ago

0 Nicholaus_Malone over 2 years ago

TI__Mastermind 22615 points

Hi Jungo,

This is a good question. The specification below the differential peak-to-peak voltage says that a single-ended high level can go up to 3.6V, so it is confusing to me as well. I will consult with the systems engineer and ask about this.

Regards,

Nicholaus

+1 Nicholaus_Malone over 2 years ago in reply to Nicholaus_Malone

TI__Mastermind 22615 points

Hi Jungo,

The peak-to-peak differential voltage you referred to is recommended operation for optimal performance. The maximum rating is shown in the Absolute Maximum Ratings section is VDD_15 + 0.5 or 2.15V. There should be no issue with the clock coming from your board.

Regards,

Nicholaus

0 user6213590 over 2 years ago in reply to Nicholaus_Malone

Prodigy 120 points

Hi Nicholaus,

Thank you for your response.
We understood that the Vrx-DIFF-p-p voltage of 1.5V is not a problem.

Best regards.
Jungo

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XIO2001: 6.8 PCI Express Differential Reference Clock Input Range : VRX-DIFFp-p