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USB Superspeed Peripherals

NaMo_1534561
Contributor II

Hello,

Could you provide the specification of VIH, VIL of CLKIN pin for FX3/FX3S?

Best regards,

Naoaki Morimoto

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1 Solution
Praveen
Community Manager
Community Manager

Morimoto-san,

As per FX3 datasheet, Vih/Vil depends on the Clock supply voltage. CVDDQ.

it could be 1.8V or 3.3V

If CVVDQ is 1.8V, then VIH min is CVVDQ-0.4V which is 1.4V

VIH max is CVDDQ+0.3V which is 1.7V

If CVDDQ is 3.3V, then VIH min is CVVDQ*0.625 which is 2.0625V

VIH max is CVVD+0.3 which is 3.6V

VIL min is -0.3V , VIL max is CVVDQ*0.25 which is 0.825

we will confirm the answer with the designers and update you back.

Datasheet link below.

Table 8 - DC Specifications has the details.

http://www.cypress.com/file/140296/download

Cheers
Praveen

View solution in original post

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1 Reply
Praveen
Community Manager
Community Manager

Morimoto-san,

As per FX3 datasheet, Vih/Vil depends on the Clock supply voltage. CVDDQ.

it could be 1.8V or 3.3V

If CVVDQ is 1.8V, then VIH min is CVVDQ-0.4V which is 1.4V

VIH max is CVDDQ+0.3V which is 1.7V

If CVDDQ is 3.3V, then VIH min is CVVDQ*0.625 which is 2.0625V

VIH max is CVVD+0.3 which is 3.6V

VIL min is -0.3V , VIL max is CVVDQ*0.25 which is 0.825

we will confirm the answer with the designers and update you back.

Datasheet link below.

Table 8 - DC Specifications has the details.

http://www.cypress.com/file/140296/download

Cheers
Praveen

View solution in original post

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