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PCA9306: VIL/VIH and VOL/VOH

Duoduo Cheng
Expert 3080 points
Part Number: PCA9306

Hi,

what's the VIL/VIH and VOL/VOH of PCA9306?

  • 0
    TI__Guru 62920 points

    Hi Duoduo,

    The device acts as a switch which provides a low-resistance path to conduct low-level signals between sides 1 and 2 while but blocking high-level signals by going high-Z (so that high levels can be pulled up to independent voltages on either side). As such, the device has no VIH/VIL specifications of its own (since it doesnt decode the voltage into high or low logic states). The effective VOL would be the VOL of whichever device is pulling the bus low (plus a small increase due to the pulldown  current flowing through the RDS of the device). The VOH would effectively be the pull-up voltage used on a particular side.

    Max

  • 0 in reply to Miguel Robertson
    TI__Expert 3080 points

    Hi Robertson

    Thanks for your reply.

    Then how can i calculate the voltage difference between SCL2 and SCL1?

    Best Regards

    Duoduo

  • 0 in reply to Duoduo Cheng
    TI__Guru 62920 points

    Duoduo,

    You could compute the current through the switch based on the pull-up resistance values on both sides, pull-down strength of the I2C master/peripheral device driving the bus low, and the series resistance of the switch.  Then, the voltage across the switch would be this current times the series resistance.  The voltage drop will generally be very low.

    Max