To maintain an appropriate output low voltage, the pull-up resistor value should limit the current through the pass transistor when it is in the ON state to less than 15 mA. This ensures a pass voltage of 260 mV to 350 mV. To set the current through each pass transistor at 15 mA, the pull-up resistor value can be calculated using the following equation:

The appropriate pull up resistor will depend on the current requirements of the application. Table 9-2 provides resistor values, reference voltages, and currents at 15 mA, 10 mA, and 3 mA. The resistor value shown in the +10% column (or a larger value) should be used to ensure that the pass voltage of the transistor is 350 mV or less. The external driver must be able to sink the total current from the resistors on both sides of the LSF0102-Q1 device at 0.175 V, although the 15 mA applies only to current flowing through the LSF0102-Q1.