I am using MAX20086 in my design and I have couple of questions.
1. What is the voltage level of I2C here? Generally, it should same as VDD but is it possible to have 1.8V I2C with 3.3V VDD?
2. What is the difference between MAX20086 and MAX20087?
Hello Himit
1) The VIH and VIL are 1.3V and 0.5V, resp. If other devices at I2C chain after cable drops can support these levels, then IC can interpret 0 and 1 correctly.
Other way around, 1.8V devices on I2C bus should be 3.3V tolerant. Since MAX2008x will use 3.3V as voltage level in this case. 
2) MAX20087 (and also 20089) are ASIL compliant. I.e. for Functional Safety (FS) applications.
Hello Himit
1) The VIH and VIL are 1.3V and 0.5V, resp. Other devices at I2C chain after cable drops can support these levels, the IC can interpret 0 and 1 correctly.
Similarly these 1.8V devices should 3.3V tolerant, since MAX2008x will drive I2C Bus with these voltages.
2) MAX20087 (and also 20089) are ASIL compliant. I.e. for Functional Safety (FS) applications.
