8.2.2.8 Shutdown Operation

The SHDN pin of the LM284x is designed so that it may be controlled using 2.3 V or higher logic signals. If the shutdown function is not to be used the SHDN pin may be tied to V_IN. This input must not be allowed to float

The maximum voltage to the SHDN pin should not exceed 42 V. If the use of a higher voltage is desired due to system or other constraints it may be used; however, a 100 kΩ or larger resistor is recommended between the applied voltage and the SHDN pin to protect the device.