To begin the design process, determine the following:

• Input voltage range
  • Use the supply voltage of the device that is driving the TCA39416 device to determine the input voltage range. For a valid logic high, the value must exceed the V_IH of the input port. For a valid logic low, the value must be less than the V_IL of the input port.
• Output voltage range
  • Use the supply voltage of the device that the TCA39416 device is driving to determine the output voltage range
  • The TCA39416 device has 10-kΩ internal pull up resistors that act as high-keepers when the I/O lines are high.