7.4.1 Inputs

The TLV701x and TLV702x input common-mode extends from V_EE to 100 mV above V_CC. The differential input voltage (V_ID) can be any voltage within these limits. No phase-inversion of the comparator output will occur when the input pins exceed V_CC and V_EE.

While TI recommends operating the TLV701x and TLV702x within the specified common-mode range, the inputs are fault tolerant to voltages up to 5.5 V independent of the applied V_CC value. Fault tolerant is defined as maintaining the same high input impedance when V_CC is unpowered or within the recommended operating range. Because the inputs of the TLV701x and TLV702x are fault tolerant, the inputs to the comparator can be any value between 0 V and 5.5 V while V_CC is ramping up. This feature allows any supply and input driven sequence as long as the input value and supply are within the specified ranges. In this case, no current limiting resistor is required. This is possible since the V_CC is isolated from the inputs such that it maintains its value even when a higher voltage is applied to the input.

The input bias current is typically 1 pA for input voltages between V_CC and V_EE. The comparator inputs are protected from undervoltage by internal diodes connected to V_EE. As the input voltage goes under V_EE, the protection diodes become forward biased and begin to conduct causing the input bias current to increase exponentially. Input bias current typically doubles for 10°C temperature increases.