TXB0104: Question about the application of SPI signal

JH Wu

Part Number: TXB0104

Tool/software:

We would like to use two TXB0104RUTR as SPI signals buffer because the traces are too long.

My question is the datasheet mentions the "Maximum data rate" is 60 Mbps, does it need to div 4 to get 15Mhz for support single signal max frequency?

Note: Current our design is Quad SPI with 16.6Mhz and may up to 33.3Mhz or 66.6Mhz.

0 Clemens Ladisch 6 days ago

Guru 257380 points

The data rate is per pin. (But 60 Mbps = 30 Mhz.)

But the TXB is not a buffer. (Its own drive strength is lower than that required for input signals, so it is the opposite of a buffer.)

A protocol with fast, bidirectional signals like QSPI cannot be buffered. You should change your design so that the QSPI device are near each other.

0 JH Wu 1 day ago in reply to Clemens Ladisch

HI Clemens,

Thanks your kindly reply and useful information.

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