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I am trying to use part #TXS0108EQPWRQ1 to shift signals from 3.3v to 5v. I have VCCA connected to 3.3v and VCCB connected to 5v. OE is connected to 3.3v as well to always enable the LS. I am noticing that the b side outputs always have roughly 2.6V on them even when there is no signal going into the corresponding A pin. It only goes to 0 V when the corresponding A pin is grounded. Is this by design? How can I resolve this?
All I/O pins have internal pull-up resistors. If the voltage is not at VCCx, then some other component is pulling the line down.
Hi Jacob,
Please see Effects of pullup and pulldown resistors on TXS and TXB devices documenting this behavior similar to what Clemens' has mentioned.
Regards,
Jack