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TS12A4516: Negative voltage support with powered off protection

Saminah C
Genius 9132 points
Part Number: TS12A4516

Hi,

Can you help with some questions on TS12A4516:

  • Can the TS12A4516 handle something like VIN- = -2.5V and VIN+ = 5.8V to then allow for that range to pass through? Or do they have to be the same value (such as +/-5.8V)?
  • What is the propagation delay through the switch between Vin and Vout, as well as the rise time impact? If I’m reading the datasheet right, TON and TOFF have to do with when switching between COM and NO, right? Once we’re already switched to COM, how long does it take for a signal to get through from Vin to COM/Vout, and is there a rise time impact?
  • Is it isolated when powered down? As in, if there is no power at all, could it handle -2.5V to 5.5V? At Vin?

Do you have any parts like this with higher current allowance - Can pass through 200mA?

Thanks

Saminah

  • 0
    TI__Mastermind 46767 points

    HI Saminah,

    1. Asymmetric supplies are okay for this part.

    2.  The propagation delay is determined by the Ron and the output capacitance of the Switch. This means that, roughly, the prop delay is apprx. the RC time constant. We define propagation delay as the time between the input of the switch reaching 50% value to the output of the switch reaching 50% value. When we reach 50% on the input we then measure how long it takes for the signal to reach 50% on the output. This is slightly less than one RC time constant (one time constant charges cap to ~ 63.2%). So this will depend on the load that the switch is connected to.

    3.This part does not have powered off protection. This means that when VDD is disconnected the signals should not present at the I/O terminals of the switch.

    Best,

    Parker Dodson