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TS3A27518E-Q1: IK Analog port diode current(5)

Shinji Tsuji
Genius 14149 points
Part Number: TS3A27518E-Q1

Hi team,

I have a question about Ik spec definition in absolute maximum ratings section. 

Ik is specified as analog port diode current and rated to 50mA with note on (5) as below. 

(5) Requires clamp diodes on analog port to V+.

1. Does it mean if NC/NO voltage exceed V+, then V+ terminal can sink up to 50mA, but that requires external clamp diode from NC/NO to V+?

2. If NC/NO voltage exceed V+(in recommended operating V+ range), is there a leakage path from NC/NO to V+? 

Or NC/NO is isolated in this case? I understand if VCC=0V, NC/NO is in High impedance. 

regards,

  • +1
    TI__Mastermind 35608 points

    Hey Shinji,

    You're correct in your understanding. The datasheet shows that there isn't a protection diode from the I/O to VCC. You would see VCC + 0.5V if this were the case. So there isn't a anything on this line. 


    You will need a external clamp diode to sink that much current when using it in the conditions listed. 

    When NC/NO voltage exceeds V+, there isn't a leakage path to V+ but you would be working outside the recommended operation conditions so we won't be able to guarantee performance and you would run risk of damage, depending on the levels being operated at. 

    When Vcc = 0V, NC/NO is high impedance but there will be some small leakage. See the INC(PWROFF), INO(PWROFF), ICOM(PWROFF) in the datasheet for the leakage. This will be powered off protected up to VCC.

    Thanks,
    Rami