SCES727A June 2008 – December 2014 TXB0104-Q1
Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.
The TXB0104 can be used in level-translation applications for interfacing devices or systems operating at different interface voltages with one another. It can only translate push-pull CMOS logic outputs. If for open-drain signal translation, please refer to TI TXS010X products. Any external pulldown or pullup resistors are recommended larger than 50 kΩ.
For this design example, use the parameters listed in Table 1. And make sure the VCCA ≤VCCB.
|DESIGN PARAMETERS||EXAMPLE VALUE|
|Input voltage range||1.2 V to 3.6 V|
|Output voltage range||1.65 V to 5.5 V|
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 TXB0104 device is driving to determine the output voltage range.
- It is not recommended to have the external pullup or pulldown resistors. If mandatory, it is recommended the value should 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.