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TXB0104: Max. Capacitive load and data rate

Rajneesh Jaiswal1
Prodigy 70 points
Part Number: TXB0104
Other Parts Discussed in Thread: TXB0304

Hi,

I am using the part ( 2 instances) for level translating Quad SPI (QSPI) signals from 1.8V to 3.3V at 30 MHz speed. The datasheet mentions the maximum capacitive load, that can be driven is 70pF.

Our application involves ribbon cables (40 cm) and trace routing in two boards. The combined capacitive load is estimated to be around 70 pF (the max value in the datasheet).

Can the device be used reliably? Or any external circuitry (pull up/down resistors) is recommended?

Also, the maximum data rate is mentioned at 60Mbps for 1.8V to 3.3V translation. Does it mean, each line can be at 60Mbps or it is the combined throughput of all the 4 lines?

Can it be used for 30 MHz QSPI application (each line at 30 MHz)?

Please feel free to suggest an alternate bidirectional level translator part, with better drive strength and speed.

Thanks,

Rajneesh

  • 0
    TI__Mastermind 42670 points

    Hey Rajneesh,

    The 60 Mbps (30 MHz) is for each channel. However, this data rate applies to a 15 pF load, the larger  ~70 pF load would likely reduce this. I recommend the TXB0304 device, it should work well with this application. I recommend leaving places holders for series damping resistors for the port connected to the ribbon cable, in case there are any ringing issues caused by the edge rate accelerator and the added parasitics.