The TLV915xS-Q1 devices feature one or more shutdown pins (SHDN) that disable the op amp, placing the amplifier into a low-power standby mode. In this mode, the op amp typically consumes about 30 µA. The SHDN pins are active high, meaning that shutdown mode is enabled when the input to the SHDN pin is a valid logic high.

The SHDN pins are referenced to the negative supply rail of the op amp. The threshold of the shutdown feature lies around 800 mV (typical) and does not change with respect to the supply voltage. Hysteresis has been included in the switching threshold to provide smooth switching characteristics. For proper shutdown behavior, the SHDN pins must be driven with valid logic signals. A valid logic low is defined as a voltage between V– and V– + 0.2 V. A valid logic high is defined as a voltage between V– + 1.1 V and V+. The shutdown pin circuitry includes a pulldown resistor, which inherently pulls the voltage of the pin to the negative supply rail if not driven. Thus, to enable the amplifier, the SHDN pins must either be left floating or driven to a valid logic low. To disable the amplifier, the SHDN pins must be driven to a valid logic high. The maximum voltage allowed at the SHDN pins is V+. Exceeding this voltage level can damage the device.

The SHDN pins are high-impedance CMOS inputs. Channels of single and dual op amp packages are independently controlled, and channels of quad op amp packages are controlled in pairs. For battery-operated applications, this feature can be used to greatly reduce the average current and extend battery life. The typical enable time out of shutdown is 8 µs; disable time is 3 µs. When disabled, the output assumes a high-impedance state. This architecture allows the TLV915xS-Q1 family to operate as a gated amplifier, multiplexer, or programmable-gain amplifier. Shutdown time (t_OFF) depends on loading conditions and increases as load resistance increases. To keep shutdown (disable) within a specific shutdown time, the specified 10-kΩ load to midsupply (V_S / 2) is required. If using the TLV915xS-Q1 without a load, the resulting turnoff time significantly increases.