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TS5A3166-Q1: Is this device bi-directional, can I apply 3.6V to VNO/VCOM pin when V+ = 0V?

Adam Torma
Mastermind 45340 points
Part Number: TS5A3166-Q1
Other Parts Discussed in Thread: SN74LVC1G66-Q1

e2e,

I'm planning to go with TS5A3166-Q1 despite its cost vs SN74LVC1G66-Q1 and have some questions:

  • Applying 3.63V to VNO/VCOM when V+= 0; I think this would be a problem since it is stated in the datasheet that the absmax of VNO/VCOM is V+ +0.5V. Correct?
  • About the control pin: if it is pulled-up to V+ and the voltage is inputted at the same time as V+, does “input transition rise and fall time” specification matter?
  • What does this arrow mean in the NO pin? Is it only from NO to COM, or is this device bi-directional?

 

If there are any similar devices (analog switch, 1ch) with longer maximum input rise/fall time specs, please recommend us.

Thank you,

Adam

  • 0
    TI__Mastermind 43135 points

    Hi Adam,

    1. This part supports powered off protection. This means that when VCC = 0V the switches will go Hi-Z.  To see the leakage current possible during the Hi-Z state please see the datasheet cut-out below - the highlighted parameters are Powered Off Leakage Currents:

    2.  That depends on the speed of the power supply to get the IC up to operating voltage. However to help avoid problems it would be safe to assume that you will have to deal with the transition time + time it takes the power supply to reach the desired voltage level. It is hard to give it an exact answer due to how the logic thresholds are defined within the device. They change with changes in the supply voltage. So while a signal may present itself at the output before the time I provided above - the channel of the switch will also be varying in terms of its on resistance - it won't reach a more "stable" value until the logic signal has been reached its defined values at a stable VCC level and to avoid issues data degradation I'd let transition time + a small margin pass so that the channel has stabilized so that the any insertion loss by the switch could be calibrated out in the data processing part of the application because it should be more consistent at that point.

    3. Device is bi-directional  - the choice on the datasheet artwork was to draw the switch contact with the arrow - it is misleading because the device is bi-directional.

    If you have any other questions please let me know!

    Best,

    Parker Dodson