JAJSEM6J April 2006 – October 2020 TXB0104
PRODUCTION DATA
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To begin the design process, determine the following:
• Input voltage range
- Use the supply voltage of the device that is driving the TXB0104 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 device is driving to determine the output voltage range.
- External pullup or pulldown resistors are not recommended. If mandatory, it is recommended that the value must be larger than 50 kΩ.
• An external pulldown or pullup resistor decreases the output VOH and VOL. Use the below equations to draft estimate the VOH and VOL as a result of an external pulldown and pullup resistor.
VOH = VCCx × RPD / (RPD + 4.5 kΩ)
VOL = VCCx × 4.5 kΩ / (RPU + 4.5 kΩ)
Where
• VCCx is the output port supply voltage on either VCCA or VCCB
• RPD is the value of the external pull down resistor
• RPU is the value of the external pull up resistor
• 4.5 kΩ is the counting the variation of the serial resistor 4 kΩ in the I/O line.