The OPA817 includes a power-down mode for low-power or standby operation and only consumes 55 μA (typical) of current when placed in power-down mode. Low-power systems that are only active for small periods of time benefit from this feature. The OPA817 can transition from low-power mode to active-mode in 300 ns (typical). For power-down pin control thresholds, refer to Section 7.5. An internal pull-up resistor of 2-MΩ provides a weak pull-up to V_S+ if PD is left unconnected. An external 1-nF capacitor to V_S+ may be used to avoid external noise coupling and false triggering. If the power-down mode is not used in an application, then connect the PD pin to V_S+.