UCC2742x provides dual Enable inputs for improved control of each driver channel operation. The inputs incorporate logic compatible thresholds with hysteresis. They are internally pulled up to V_DD with 100kΩ resistor for active high operation. When ENBA and ENBB are driven high, the drivers are enabled and when ENBA and ENBB are low, the drivers are disabled. The default state of the Enable pin is to enable the driver and therefore can be left open for standard operation. However, if the enable pin is left open, it is recommended to terminate any PCB traces to be as short as possible to limit noise.  If large noise is present due to non-optimal PCB layout, it is recommended to tie the Enable pin to Vcc or to add a filter capacitor (0.1 µF) to the Enable pin. The output states when the drivers are disabled is low regardless of the input state. See the truth table of Table 7-2 for the operation using enable logic.

Enable input are compatible with both logic signals and slow changing analog signals. They can be directly driven or a power-up delay can be programmed with a capacitor between ENBA, ENBB and AGND. ENBA and ENBB control input A and input B respectively.