DP83867IR: 9.2.1.2 Clock In (XI) Recommendation

Hirotaka Matsumoto

Part Number: DP83867IR

Hi all

Would you mind if we ask DP83867IR?

<Question1>
For a 1.8-V clock source, XI should be tied to the clock source.
->Our customer uses VDDIO=1.8V.
In spite of VDDIO voltage, XI should be tied to the clock source in case of 1.8-V clock source.
Is our recognition correct?

<Question2>
In case of XI=1.25V-1.65V, does this device accrept?

Kind regards,

Hirotaka Matsumoto

over 6 years ago

0 Rob Rodrigues over 6 years ago

TI__Mastermind 19780 points

Hi Hirotaka-san,

1. Yes, regardless of VDDIO level, XI should be tied to a 1.8V clock source.

2. I am looking into a spec for minimum swing on XI. I think 1.25V is OK, but need to confirm.

Best Regards,

0 Rob Rodrigues over 6 years ago in reply to Rob Rodrigues

TI__Mastermind 19780 points

Hi Hirotaka-san,

See below for XI spec for DP83867.

DP83867	Min	Typical	Max
XI Input p2p for 25 MHz Oscillator Input ( Volts)	1.4	1.65	1.85

Best Regards,

0 Hirotaka Matsumoto over 6 years ago in reply to Rob Rodrigues

Guru 27585 points

Rob san

Thank you so much for your cooperation always!
OK, we got it!

Kind regards,

Hirotaka Matsumoto

Interface

Interface forum

DP83867IR: 9.2.1.2 Clock In (XI) Recommendation