TXS0104EZXUR datasheet(21/41 Pages) TI

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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 TXS0104E 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 TXS0104E device is driving to determine the output voltage

range.

– The TXS0104E device has 10-kΩ internal pullup resistors. External pullup 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.

VOH = VCCx × RPD / (RPD + 10 kΩ)

(1)

where

VCCx is the supply voltage on either VCCA or VCCB

RPD is the value of the external pull down resistor

9.2.3 Application Curve

2 V

5 V

100 ns/div

VCCA = 1.8 V

VCCB = 5 V

Figure 9-2. Level-Translation of a 2.5-MHz Signal

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TXS0104E

SCES651I – JUNE 2006 – REVISED OCTOBER 2020

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TXS0104EZXUR Datasheet(PDF) 21 Page - Texas Instruments