LSF0108: the right solution for LPC ports application

Antony Fu

Part Number: LSF0108
Other Parts Discussed in Thread: TXB0304

Hello team,

My customer is looing for the LPC ( Low Pin Count) 1.8V (SOC side) to 3.3V (LPC device side.) level shift solution, LPC is push-pull at SOC side, and open-drain at device side. the speed is 33MHz.

I had read some topics on E2E, such as "LSF0108: Application for LPC interface" and "TXB0304: Intel Gemini Lake + TXB0304", but I still don't know which part is the right solution here, so would you like to advise one?

Thanks,

Antony

over 5 years ago

0 Karan Kotadia over 5 years ago

TI__Genius 16735 points

Antony,

The best solution for an open-drain signal with those speeds would be an LSF part. How many channels do you need?

Do note, that the auto-bidirectional devices have no drive strength. So your trace lengths have to be minimal and your device should not require any drive strengths/ have CMOS inputs.

Thanks!

-Karan

0 Antony Fu over 5 years ago in reply to Karan Kotadia

TI__Expert 3345 points

Hi Karan,

Customer needs 5 channel device here.

and maybe the signal speed will be up to 60MHz in future.

I had looked through the forums about another case of LSF0108, it looks like it has problem with LPC signal, such as the offset of low level, the slow slew rate, and maybe it has thermal issue too. So whether we have some test data based on this application?

Thanks,

Antony

0 ShreyasRao over 5 years ago in reply to Antony Fu

TI__Guru 62050 points

Hi Antony,

The datasheet has an example of 50Mhz signal for 1.8 <>3.3V.

Logic

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LSF0108: the right solution for LPC ports application