NVT2004TL datasheet(9/33 Pages) PHILIPS

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NVT2003_04_06

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Product data sheet

Rev. 5 — 19 February 2014

9 of 33

NXP Semiconductors

NVT2003/04/06

Bidirectional voltage-level translator

7.4 How to size pull-up resistor value

Sizing the pull-up resistor on an open-drain bus is specific to the individual application and

is dependent on the following driver characteristics:

• The driver sink current

• The VOL of driver

• The VIL of the driver

• Frequency of operation

The following tables can be used to estimate the pull-up resistor value in different use

cases so that the minimum resistance for the pull-up resistor can be found.

Table 6, Table 7 and Table 8 contain suggested minimum values of pull-up resistors for

the PCA9306 and NVT20xx devices with typical voltage translation levels and drive

currents. The calculated values assume that both drive currents are the same.

VOL =VIL =0.1  VCC and accounts for a 5%VCC tolerance of the supplies, 1%

resistor values. It should be noted that the resistor chosen in the final application should

be equal to or larger than the values shown in Table 6, Table 7 and Table 8 to ensure that

the pass voltage is less than 10 % of the VCC voltage, and the external driver should be

able to sink the total current from both pull-up resistors. When selecting the minimum

resistor value in Table 6, Table 7 or Table 8, the drive current strength that should be

chosen should be the lowest drive current seen in the application and account for any

drive strength current scaling with output voltage. For the GTL devices, the resistance

table should be recalculated to account for the difference in ON resistance and bias

voltage limitations between VCC(B) and VCC(A).

The applied enable voltage Vpu(H) and the applied voltage at Vref(A) and Vref(B) should be such that Vref(H) is at least 1 V higher

than Vref(A) and Vref(B) for best translator operation.

Fig 10. Bidirectional level shifting between two different power domains

002aae967

VREFA

GND

VREFB

10 EN

NVT2003

200 k

RPU

Vpu(B) = 3.3 V

I2C-BUS

DEVICE

SCL

SDA

VCC

GND

Vpu(A) = 3.3 V

RPU

I2C-BUS

MASTER

SCL

SDA

VCC

GND

Vpu(H)

Vpu(B)

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