TFP401 - tr, tf of ODCK and data

Ryuji

Guru 20090 points

Other Parts Discussed in Thread: TFP401

Hello,

Could you please let me know the min value of tr1, tr2, tf1, tf2?

Our customer is connect this device to other LVDS device.
These valueis necessary for checking the setup time on the LVDS device.

Best Regards,
Ryuji Asaka

over 9 years ago

0 Elias Villegas M. over 9 years ago

TI__Guru* 76130 points

Hello,
There is no MIN value, they can use the set-up and hold time listed on Section 7.7 in order to accommodate theirs.
Regards

0 Ryuji over 9 years ago in reply to Elias Villegas M.

Guru 20090 points

Hi Elias,

Their LVDS device setup time is 2ns(min).
However, the TFP401 setup time is 1.8ns(min).
If the tf2 is longer than 0.2ns, they can keep 2ns(1.8ns + 0.2ns) setup time for LVDS device.
Are there any possibility that the tf2 is shorter than 0.2ns?

Best Regards,
Ryuji Asaka

0 Ryuji over 9 years ago in reply to Ryuji

Guru 20090 points

Hi Eliasn,

I found the similar question of the following post.
I will check the ODCK frequency to the customer.

e2e.ti.com/.../381898

Best Regards,
Ryuji Asaka

0 Ryuji over 9 years ago in reply to Ryuji

Guru 20090 points

Hi Elias,

The ODCK is 75MHz.
Could you please let me know the set up time (tsu1) of this case?

Is the set up time proportional of the ODCK frequency?
Does setup time of 75MHz become 3.96ns? (165MHz/75MHz * 1.8ns = 3.96ns)
I understood that we can not guarantee this specs, please let me know the reference data.

Best Regards,
Ryuji Asaka

0 Elias Villegas M. over 9 years ago in reply to Ryuji

TI__Guru* 76130 points

Hello,
Yes, the setup time is proportional to ODCK, however it can't be calculated by your formula, datasheet specifies maximum according to the operating frequencies of the device.
Regards

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TFP401 - tr, tf of ODCK and data