TLIN1027-Q1: TXD & RXD Pin Clamping Diode

Part Number: TLIN1027-Q1

Hi team,

Could you please advise if there is/are any clamping diode(s) at TXD and RXD pins? It will be good if there is a simplified drawing on the pin model. Thank you! 

  • Hi PY,

    I assume you are asking about whether there is backbiasing from TXD to VSUP when unpowered, or if VSUP < VLOGIC? You can apply between -0.3 V and 6 V to the TXD pin without concern for damaging the part, even when unpowered, though it is recommended to keep this voltage between GND and 5.25 V. This also applies to the RXD pull-up.

    If negative voltages are applies, then yes, I would expect to see current flow from GND to the pin.

    Does this help clarify? Or is there a specific use case I can help address?

    Best,

    Danny

  • Hi Danny,

    Thank you. This is for customer to understand the device pin model for them to implement test in their factory - open, short, leakage tests etc. Customer will need to know if there is/are clamping diodes associated with the pins in order to implement respective tests. 

    It is not so much about the max voltage rating. 

  • PY,

    Ok, thanks for the clarification!

    Yes, there is a diode from GND to TXD/RXD on the TLIN102x(A)-Q1 devices. Usually, when doing a diode check from GND to TXD/RXD on a multimeter, I see a forward voltage just over 0.5 V.

    Hopefully this helps, let me know.

    Best,

    Danny

  • Hi Danny,

    Any clamping diode pointing upwards? Like from pin to Vsup? 

  • Hey PY,

    Between TXD/RXD and VSUP, it should be high impedance, provided the pins are kept within the absolute maximum ratings.

    Best,

    Danny