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TCA9509: TCA9509 SDAA/SCLA PIN input leakage current test condition?

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Prodigy 20 points

Part Number: TCA9509

During testing of the TCA9509, I found that the input leakage current values for SDAA and SCLA do not match the specifications in the datasheet. My test conditions are as follows:
① EN = VCCA, VCCA = 1.8V, VCCB = 3.3V, SCLB = 3.3V, SCLA = VCCA. Under these conditions, the input leakage current of SCLA is approximately 50 µA.
② EN = VCCA, VCCA = 1.8V, VCCB = 3.3V, SCLB = 0V, SCLA = 0.2V. Under these conditions, the input leakage current of SCLA is approximately 100 µA or higher.
Furthermore, when EN = 0V, the measured input leakage current of the TCA9509 still does not match the datasheet specifications.
 
Since the TCA9509 datasheet does not provide detailed test conditions for input leakage current, could you please provide the corresponding test conditions and confirm whether the input leakage current test results for the TCA9509 are consistent with the datasheet?
img_v3_02vn_3b002038-a8e1-43e5-a902-88c5846ea73g.jpg
  • 0
    TI__Mastermind 45930 points

    When the device is disabled, the outputs are placed in HIGH-Z; their leakage values are those that you have marked in the image (max: 10uA)

  • 0 回复 Vivian Gao
    Prodigy 20 points

    Dear sir:

            Thank you for your reply. Regarding the disabled state you mentioned, we performed tests. The results show that when VCCA = 1.8 V, VCCB = 3.3 V, and OE = 0 V, SCLA and SDAA are not in a high-impedance state; the internal current source remains active. Therefore, the leakage current I measured still exceeds the specification. Hence, could the previous HIGH-Z conclusion be incorrect?