6.5.1 Output Drive Strength Control

The LAN8670/1/2 digital outputs are configurable to one of four drive strengths. By changing the digital output impedance in combination with the output load, the rise and fall time of driven output signals may be adjusted to meet timing requirements while reducing the sharp transitions and ringing that can be a source of unwanted radiated emissions. The pin output drive strength is configurable in groups based on their application as defined in the table below. The output drive level for each pin group is configured within the Pad Control 3 (PADCTRL3) register. The output drive currents are specified in the DC Specifications section.