TS3A27518E-Q1: Max voltage of control inputs when Vcc is 1.8V

Adam,

The TS3A27518E-Q1 has 1.8-V compatible logic threshold that is backwards compatible with 2.5-V and 3.3-V logic thresholds. The supply voltage VCC is independent of the logic voltage (in your case: 1.8-V).

In your case, VCC = 1.8V, this means that your logic inputs can see a maximum voltage of 3.3-V or more specifically 3.6-V as listed in the datasheet.

So if you bias the EN/IN1/IN2 pin at 3.3-V while VCC = 1.8-V, this should work out.

I also attached two links to tech notes about 1.8-V logic control voltage below:

https://www.ti.com/lit/an/scea030a/scea030a.pdf

https://www.ti.com/lit/an/scaa126/scaa126.pdf?ts=1596563462412&ref_url=https%253A%252F%252Fwww.google.com%252F

Hope this answers your question!

Regards,

Tyler