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TCA9509: Datasheet specification inquiry

Boyan Lu
Expert 7005 points
Part Number: TCA9509
Other Parts Discussed in Thread: TCA9517A

Tool/software:

Hi Team

My client has some questions about how the datasheet specifications should be viewed.

1. The customer said that VIL VIH VOL VOH these parameters have a maximum value and a minimum value or an intermediate value. Which one should be compared to be correct, or should it be within this range? In addition, why do some have only maximum values ​​and no minimum values?

2.Can you also help explain what VLC is?

for example: the TCA9509 shows the VILC is MIN: 0.11V TYP:0.15V,

That means the waveform will <0.15 >0.11, or I misunderstanding.

Thanks,

Boyan

  • 0
    TI__Mastermind 47328 points

    Hi Boyan,

    Boyan Lu said:
    1. The customer said that VIL VIH VOL VOH these parameters have a maximum value and a minimum value or an intermediate value. Which one should be compared to be correct, or should it be within this range? In addition, why do some have only maximum values ​​and no minimum values?

    The VIL/VIH are based off the I2C standard.

    The VOL is based off of the buffers ability to drive a low output signal. 

    The VOH is "driven" by the pull-up resistor on the I2C bus. 

    Boyan Lu said:
    2.Can you also help explain what VLC is?

    I explained this in the TCA9517A thread, it is essentially the same as in that device except for the direction

    VILC is the minimum voltage needed to pass a LOW from  A-side to B-side. It is recommended to ensure that all devices on the A-side of the TCA9509 are able to drive below a VILC(min). This means <0.11V for the respective voltage range. 

    Regards,

    Tyler

  • 0 in reply to Tyler Townsend
    TI__Expert 7005 points

    Hi Tyler

    Thank you very much for your detailed explanation.

    Regards,

    Boyan

  • 0 in reply to Boyan Lu
    TI__Mastermind 47328 points

    Hi Boyan,

    I am glad I could help. if you have any additional questions please feel free to reach out again. 

    Regards,

    Tyler

  • 0
    Prodigy 150 points

    HI Tyler

    here is Tommy from ACCTON

    I have some question for the TCA9509 spec

    in the befoe we use the spec like picture below

    TCA9517A

    input VIL Aside

    input VIH Aside

    >-0.5
    <0.15V

    >0.7VCCA
    <1.8V

    TCA9517A

    ouput VOL Bside

    <0.2V

    TCA9517A

    input VOL Aside

    <0.3V

    TCA9517A

    output VIL Aside

    output VIH Aside

    >-0.5V
    <0.3VCCB

    >0.7VCCB
    <5.5V

    that inculding the VILC

    If there has any wrong, pleasw tell me

    Thanks

    Tommy

  • 0 in reply to Tommy Tuu
    TI__Mastermind 40136 points

    Hi Tommy,

    The numbers look correct, but I am assuming the parameters were mislabeled, please see updated table below:

    TCA9509

    input VIL Aside

    input VIH Aside

    >-0.5
    <0.15V

    >0.7VCCA
    <1.8V

    TCA9509

    ouput VOL Bside

    <0.2V

    TCA9509

    input VOL Aside

    <0.3V

    TCA9509

    output VIL Bside

    output VIH Bside

    >-0.5V
    <0.3VCCB

    >0.7VCCB
    <5.5V

    Regards,

    Jack