Hello,
Our PCA9545A Vcc supply range is 2.3V to 5.5V, so Vcc can't support 1.8V supply. The VIH and Vil of our part spec is as below(0.3Vcc~0.7Vcc), so it can't support 1.8V LVCOMS, but our PCA9545A can support 1.8V in the datasheet, can you help to explain it? thanks