Hello Experts,
For some years, I have routinely used TXS0108E as level-converter/buffer for low-speed "GPIO" signals between my FPGA and a connector exposing them to the world - with the TXS0108E's OE function, I can keep the device high-impedance until my system is powered, providing some protection for the delicate FPGA pins.
Now I have a need to connect my board to a customer's board through say 20cm of cable - and my customer also uses TXS0108E his end for similar purposes. For the sake of this question, let's say VCCA=1.8V is used for internal connection both ends, and VCCB=3.3V is used for external connection both ends.
Is such a cascading of devices recommended, or possibly actively discouraged? My concern is the stated limits on recommended pullups/pulldowns - that may be violated simply by cascading the devices?
If you say no-go I will simply have to add e.g. unidirectional push-pull devices somewhere, for this specific application I know signal directions - but I would prefer to keep the elegance and flexibility of the auto-sensing bidirectional buffers.
Cheers, Martin
