TXB0104_17 Datasheet, PDF (16/34 Pages) Texas Instruments – 4-Bit Bidirectional Voltage-level Translator With Automatic Direction Sensing and 15-kV ESD Protection

TXB0104
SCES650G – APRIL 2006 – REVISED NOVEMBER 2014
9 Application and Implementation
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NOTE
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.
9.1 Application Information
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.
9.2 Typical Application
9.2.1 Design Requirements
For this design example, use the parameters listed in Table 1. And make sure the V_CCA ≤V_CCB.
DESIGN PARAMETERS
Input voltage range
Output voltage range
Table 1. Design Parameters
EXAMPLE VALUE
1.2 V to 3.6 V
1.65 V to 5.5 V
9.2.2 Detailed Design Procedure
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 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 TXB0104 device is driving to determine the output voltage
range.
- Don’t recommend 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 V_OH and V_OL. Use the below equations to draft
estimate the V_OH and V_OL as a result of an external pulldown and pullup resistor.
V_OH = V_CCx × R_PD / (R_PD + 4.5 kΩ)
V_OL = V_CCx × 4.5 kΩ / (R_PU + 4.5 kΩ)
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