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Clocks

shma_1538871
Contributor

I'm evaluating CY2305SXI-1

I don't use CLK3 and CLK4.

Should I connect Open or pull up or pull down?

Please tell me recommended Pin connection if unused CLK3&4.

Matsushita

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1 Solution
Anonymous
Not applicable

Hi Matsushita-san,

For unused pin connection, you can refer to Unused Clock Outputs section in "Design and Layout Guidelines for Cypress Clock Generators" below.

clock.jpg

Regards,

Nada

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4 Replies
Anonymous
Not applicable

Hi Matsushita-san,

For unused pin connection, you can refer to Unused Clock Outputs section in "Design and Layout Guidelines for Cypress Clock Generators" below.

clock.jpg

Regards,

Nada

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shma_1538871
Contributor

Hi Nada san,

Thank you for your reply !

I'm confirming Guide line.

Let me confirm.

That means Unused pin can leave un-terminated.

And if user concerns EMI or skew, Uncesd pin should connect 5 to 10pF capacitor.

Is it correct?

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Anonymous
Not applicable

Hi Matsushita-san,

Yes your understanding is correct.

Regards,

Nada

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shma_1538871
Contributor

Hi Nada san,

Thank you for your reply!

Best regards

Matsushita

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