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 VIH of the input port. For a valid logic low, the value must be less than the VIL 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.