To begin the design process, determine the following:
Input voltage range
Use the supply voltage of the device that is driving the TXS0108E-Q1 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 TXS0108E-Q1 device is driving to determine the output voltage range.
The TXS0108E-Q1 device has smart internal pull-up resistors. External pull-up resistors can be added to reduce the total RC of a signal trace if necessary.
An external pull-down resistor decreases the output VOH and VOL. Use Equation 1 to calculate the VOH as a result of an external pull-down resistor.