The SN75LVPE5421 has five 5-level inputs pins (EQ1, EQ0, GAIN, MODE, and RX_DET) that are used to control the configuration of the device. These 5-level inputs use a resistor divider to help set the 5 valid levels and provide a wider range of control settings. External resistors must be of 10% tolerance or better. The EQ0, EQ1, GAIN, and RX_DET pins are sampled at power-up only. The MODE pin can be exercised at device power up or in normal operation mode.