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LSF0108: Maximum supported speed at Vcca = 1.8V.

Roy Hsu
Genius 9390 points
Part Number: LSF0108
Other Parts Discussed in Thread: TXB0104, TXU0304

Hi Team,

What's the maximum supported speed at Vcca = 1.8V and Vccb = 3.3V? The LSF0108 datasheet does not have the same Timing Requirement table as the one in the TXB0104 datasheet and hence the question.

My customer would like to use this device in a 66MHz SPI application.

Thanks!

Roy

  • 0
    Guru 317080 points

    The LSF is a passive switch. The speed of rising edges is limited by the RC low-pass filter formed by the pull-up resistors and the total capacitance of the traces/cables/other devices.

    66 MHz might be possible, depending on the capacitance, if the pull-ups are strong enough. Better use a buffered translator like the TXU0304.