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TCA9617B: whether we can use a external pull up resistor to EN and VCCA?

Frank Xiao
Genius 12055 points

Part Number: TCA9617B

Hi team,

My customer is using the TCA9617B now.  For the EN,  the EN is pulled up to VCCB internally.  whether we can use a external pull up resistor to VCCA? BTW: The VCCA is the same voltage level as VCCB. ( it should be ok)

  • 0
    TI__Guru* 81641 points

    Hey Frank,

    For this device, it should be okay as your have 3.3V for both power supplys and the B version of this device will remain in result until both power supplys power up.

    I do notice you have 20 ohm series resistors, you need to make sure that whatever is connected to the 20 ohm resistors can drive the voltage low below 0.4V, using a 20 ohm resistor will make this harder to do (not impossible). Just a keep this in mind.

    Thanks,

    -Bobby