TXU0304: SPI 66MHz clock speed rate

Mike Yu

Intellectual 2320 points

Part Number: TXU0304
Other Parts Discussed in Thread: SN74AXC4T774, TXB0304

Hi Team,

The customer are studying for SPI 66MHz (1.8V to 3.3 V), can TXU0304 support up to 66MHz SPI application?

Do we have any other the same design before? Thank you.

Best regards,

Mike

over 3 years ago

0 Dylan Hubbard over 3 years ago

TI__Mastermind 45855 points

Hey Mike,

Data rates are provided in the data sheet:

That seems pretty fast for normal SPI, I would double check that you arent looking at other forms of SPI like QSPI. This device will not work for QSPI.

0 Mike Yu over 3 years ago in reply to Dylan Hubbard

TI__Intellectual 2320 points

Hi Dylan,

Thanks for the feedback, I had also seen the table in the DS. For the customer application, it seems that it can only support up to 100MHz.

If TXU0304 is not workable, would you have another suggestion? Thank you.

Best regards,

Mike

0 Dylan Hubbard over 3 years ago in reply to Mike Yu

TI__Mastermind 45855 points

Hey Mike,

SN74AXC4T774 is faster at those lower voltages. It also allows you to set direction of each of its 4 channels making it flexible and ideal for SPI. 66MHz should be easily achievable for that device as long as a light capacitive load is maintained (<70 pF).

0 Mike Yu over 3 years ago in reply to Dylan Hubbard

TI__Intellectual 2320 points

Hi Dylan,

Thanks for the suggestion. However, the project were already production, the customer want to find the solution which P2P as PI4ULS3V504. That why I change the proposal TXU0304. Since, the TXU0304 can't support 66HMz, then I would like to propose TXB0304 which can support 140Mbps, it there any concern? Thank you.

PI4ULS3V504 (diodes.com)

Best regards,

Mike

0 Dylan Hubbard over 3 years ago in reply to Mike Yu

TI__Mastermind 45855 points

Hey Mike,

I have no concern. Just make sure the capacitive loading is ≤15 pF.

0 Mike Yu over 3 years ago in reply to Dylan Hubbard

TI__Intellectual 2320 points

Hi Dylan,

Get it, thanks for your reply.

Best regards,

Mike

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TXU0304: SPI 66MHz clock speed rate