TCA9539: Input Impedance

Sadanori Kato

Part Number: TCA9539

Hi,

The I/O ports are set to the input in default settings and become the high impedance. So, could you please tell me the input impedance concretely?

Best regards,
Kato

over 4 years ago

0 Miguel Robertson over 4 years ago

TI__Guru 62920 points

Hello Kato-san,

The input impedance is characterized via leakage current measurements, which are specified in the Electrical Characteristics table as "IIH" and "IIL." These values are at most +/- 1 uA. You could consider this maximum leakage to correspond to a minimum input resistance of 5.5 V / 1 uA = 5.5 MOhm.

Regards,
Max

0 Sadanori Kato over 4 years ago in reply to Miguel Robertson

Guru 36540 points

Hi Max-san,

Thank you for the information.

I understand.

Best regards,
Kato

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TCA9539: Input Impedance