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TS5A23166: Asking for the Analog Switch TS5A23166 design review

SHH
Mastermind 31116 points
Part Number: TS5A23166

Hi Sir,

 

My customer would like design TS5A23166.

Would you please review schematic and provide your comment?

 

 

BR,

SHH

  • 0
    TI__Mastermind 46697 points

    Hi SHH,

    The only I concern I see has to do with the IN pins in the schematic. 

    The logic thresholds are as follows:

    VIL(max) = 0.8V

    VIH(min) = 2V

    IN1/IN2 are both connected to a resistor divider where it goes 5V -> 47k resistor -> IN1/IN2 -> 100 Ohm Resistor -> 10K resistor to ground. If the control signal is floating the voltage at IN1/IN2 are:

    V_IN1/IN2 = (10k + 100) / (10k + 100 + 47k) * 5 = 0.884V which > VIL(max) which means the switch is operating in an undefined region when the control signal is floating.

    If the control signal can assert both high and low I'd remove the 47K ohm resistor to VDD - because you already have a pull down to ensure known states when the control signal is floating and there won't be extra power being burned by the 47K ohm resistor .

    Everything else looks okay.

    If you have any other questions please let me know!

    Best,

    Parker Dodson