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TMS320C6748: The questions of power rail

Luke Chen

Expert 5090 points

Part Number: TMS320C6748

Hi champs,

My customer would like to know,

If CVDD is 1.28V, can C6748 works at 400 MHz without problems?
If the answer is yes, can he connect that 1.28V to RTC_CVDD, PLL0_VDDA and PLL1_VDDA?
Can he leave SATA_VDD floating(NC) if he doesn't use SATA function?

Please advise, thanks.

Regards,

Luke

over 2 years ago

0 Colin Callaghan over 2 years ago

TI__Expert 8275 points

Hi Luke,

Luke Chen said:
If CVDD is 1.28V, can C6748 works at 400 MHz without problems?

CVDD was characterized at both 1.2V and 1.3V. Your 1.28V configuration at 400MHz is an uncharacterized and unsupported; we cannot guarantee the behavior or functionality of the device at 1.28V

from: https://www.ti.com/lit/an/sprabf9/sprabf9.pdf?ts=1692197322233&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FTMS320C6748

Luke Chen said:
Can he leave SATA_VDD floating(NC) if he doesn't use SATA function?

please refer to the table below - the silicon revision is relevant in the answer.

from: https://www.ti.com/lit/gpn/tms320c6748

Regards,

Colin

0 JIAN CUI over 2 years ago in reply to Colin Callaghan

Prodigy 10 points

HI Could you give any suggestions about question 2? thanks.

0 Colin Callaghan over 2 years ago in reply to JIAN CUI

TI__Expert 8275 points

Hi Jian,

Is questions 2:

Luke Chen said:
If the answer is yes, can he connect that 1.28V to RTC_CVDD, PLL0_VDDA and PLL1_VDDA?

If so, the answer to the first part of the if-question is 'no'.

Regards,

Colin