Other Parts Discussed in Thread: TMUX1511,
Tool/software:
I have an application where I need an I2c GPIO expander but I also need to make sure the GPIOs are powered off protected, need to remain high impedance when Vcc=0V. It's unclear to me if the TCAL9539 supports this as other products such as the TMUX1511 specifically call this out in the datasheet. From the TCAL9539 datasheet there is the diagram below.
Section 8.3.1 says "When an I/O is configured as an input, FETs Q1 and Q2 are off (see Figure 8-2), which creates a high-impedance input. The input voltage may be raised above the supply voltage to a maximum of 3.6V"
I'm not sure if that would also apply when the supply voltage is 0V? Will it be in a defined state or is that only applicable when powered to an operating voltage?
Thanks,
Nick
