7.3.9 1.8-V to 5-V Logic Interface

All digital input and output pins are compatible with any logic supply voltage between 1.8 V and 5 V. Connect the interface logic supply voltage to the IOV_DD pin. Although timing is specified down to 2.7 V (see the timing diagrams), IOV_DD can operate as low as 1.8 V, but with degraded timing and temperature performance. For the lowest power consumption, logic V_IH levels should be as close as possible to IOV_DD, and logic V_IL levels should be as close as possible to GND.