The CI Plus library provides a programmable bi-directional I/O cell designed to meet the signal interface requirements of the Common Interface. This library is offered as a supplement to the I/O
libraries provided by Aragio Solutions. This library is compatible with the CI Plus Specification, but it is not fully compliant. The I/O cell is 5V
tolerant and interfaces to the Common Interface at TTL logic levels, but operates in the 3.3V power domain.