TXB0101DBVT datasheet(14/31 Pages) TI1

14 / 31 page

A. V is the input threshold voltage of the TXB0101 (typically

/2.

V is the supply voltage of the external driver.

CCI

–(V – V )/4 k

V /4 k

TXB0101

SCES639C – JANUARY 2007 – REVISED JUNE 2015

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9.2.1.1 Input Driver Requirements

Typical IIN vs VIN characteristics of the TXB0101 are shown in Figure 7. For proper operation, the device driving

the data I/Os of the TXB0101 must have drive strength of at least ±2 mA.

Figure 7. Typical IIN vs VIN Curve

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 TXB0101 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 TXB0101 device is driving to determine the output voltage

range.

–

External pullup or pulldown resistors are not recommended. If mandatory, TI recommends the value

should be larger than 50 k

Ω.

•

An external pulldown or pullup resistor decreases the output VOH and VOL. Use Equation 1 and Equation 2 to

draft estimate the VOH and VOL as a result of an external pulldown and pullup resistor.

VOH = VCCx × RPD / (RPD + 4.5 kΩ)

(1)

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 pulldown resistor

•

RPU is the value of the external pullup resistor

•

4.5 k

Ω is the counting the variation of the serial resistor 4 kΩ in the I/O line.

(2)

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