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TS5A23157-Q1: Supply question

Lanxi Li
Expert 6785 points
Part Number: TS5A23157-Q1

Hello team,

My customer has related questions about TS5A23157-Q1 as below, could you please give a detailed explain about each condition.

（1） If the V + power supply is 3.3V and the input and output signal (no, NC, COM) level is 1.8V, is there any affected about this usage?

（2） If the V + power supply is 1.8V and IN_pin is 3.3V, does the chip support it?

（3） If the V + power supply is 1.8V and the input and output signal is 3.3V, what will be the problem if they use it by this way? 

Thank you for support.

Best regards,

Lanxi Li

  • 0
    TI__Guru 52132 points

    Hi Lanxi,

    1.  The TS5A23157-Q1 can pass 0V to VDD. VDD = 3.3V can pass 0V to 3.3V through the switch. Below is the on resistance versus input voltage at different supply voltages. The 3V line is the closest to your supply and the typical on resistance will vary based on the input voltage from 0V to 1.8V on the 3V line. Since your supply is 3.3V the on resistance may be slightly smaller. How this affects the output signal depends on loading impedance.  

    2. Yes this part support a voltage input at the IN pin of 3.3V when V+ = 1.8V - please see datasheet excerpt below:

    VIN - the voltage w.r.t. ground at the IN pin can be from -0.5V to 6.5V - there is no relation to V+ for the max voltage on the IN pin - whereas on the NC/NO/COM pins the max voltage is V+ + 0.5V. Since there is no V+ in the max VIN voltage, 3.3V on IN pin is okay when V+ = 1.8V.

    3.Yes there will be a problem. This device will only pass 0V to V+; so if V+ = 1.8V it cannot accept/pass voltages above V+. This will also cause the ESD diodes on the switch path to start to conduct which could cause damage to the part due to large currents possible through the ESD diodes which could short inputs to V+ for overvoltage cases and damage the part. 

    If you have any other questions please let me know!

    Best,

    Parker Dodson