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LSF0204: Schematic review

Charles Jeon
Expert 2975 points

Part Number: LSF0204

Hi Team

I want to review schematic of customer.

SENSOR_RSTN and SENSOR_CLK are PUSH-PULL type.

So, I connected PULL-UP to A PORT (SENSOR SIDE) only.

SENSOR_CLK is 37.125MHz, 200ohm is connected to B port, 100ohm is connected to A port.

Please check, is there no problem with the switching speed?

  • 0
    TI__Guru* 97146 points

    Hi Charles,

    There's a video series that explains how to design with the LSF family in detail located here:

    https://training.ti.com/logicminute

    As long as the SENSOR_RSTN and SENSOR_CLK drivers can handle the total current sink -- 3.3V @ 200 ohm and 100 ohm @ 1.8V will produce a total of (1.8/100) + (3.3/200) = 34.5mA -- then I don't see any problems.  The only other factor will be the parasitic capacitance, but with typical values (15pF) I would expect this to work without any problems.