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Original question:

PCA9306: EN input requirements when used in the "Switch Configuration"

PCA9306: VREF2 higher then VREF1

Christopher Allen1
Prodigy 10 points
Part Number: PCA9306


Can the PCA9306 be used in a configuration where VCC2 is lower then VCC1. VCC1 = 3.3V and VCC2 = 2.5. The 3.3V side is the host side and the 2.5V side can/will be powered down. Is there another device I should be using or should I simply flip the part. I can disable the part with daughter board reset which is driven from the 3.3V side.

Thanks.

  • 0
    TI__Guru* 77381 points

    Hey Christopher,

    You can use the device where EN and Vref2 pins are tied together and feed into Vcc2 which is lower than Vcc1. The only thing this will really affect is some minor prop delay when you drive side 1 low.

    "I can disable the part with daughter board reset which is driven from the 3.3V side."

    Make sure you don't tie enable to 3.3V logic HIGH. If you want to tie the enable pin of our device, make sure it is hi-z with a pull up resistor (ideally shorted to Vref2 and enable with a 200k pull up to Vcc2) and to disable, drive low on the enable pin.

    Thanks,

    -Bobby