ISO1212: Could you help to share the IS01212 benift than MAX22518

Hi Alex,

Thank you for reaching out to us!

1. The max22518 Power consumption Is less than TI ,Right?

To estimate the power consumption, we can use the following equation.
Power consumption = filed side current * filed side voltage + logic side current * logic side voltage.

MAX22518 is a digital isolator, and hence it draws very little current at the input with the filed side current of 220uA. A 10kohm resistor is needed at the input to support the 24V field voltage. The logic side current of MAX22518 is 10mA. Therefore, the power consumption for a single channel device is 220uA*24V + 10mA*5 = 55.3mA 

ISO1212 is an isolated digital input receiver and it complies with IEC61131. It is built to draw a current of 2.2mA at the field side specified by the IEC61131 standard. The logic side current is 4mA at 5V. The calculated power consumption for a single channel device is 2.2mA*24V + 4mA*5V = 72.8mA

2. The ISO1212 output is postive logic output, when input is high, right?

Yes. ISO1212 is positive logic. The output logic follows the input logic.

3. if the input is high, i hope the output is negative logic output, may i do the setup?

ISO1212 does not have an inverting output. 
FYI, page 31 of the ISO1212 datasheet shows a configuration with a bidirectional input module that detects
both negative and positive inputs and outputs a positive logic that may be your interest.

Regards,

Alfred