8 Application and Implementation

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, as well as validating and testing their design

implementation to confirm system functionality.

8.1 Application Information

The LSF devices can perform voltage translation for open-drain or push-pull interfaces. Table 8-1 provides

common interfaces and the corresponding device recommendation from the LSF family, which supports the

corresponding bit count.

Table 8-1. Voltage Translator for Common Interfaces

Part Name

Channel Number

Interface

LSF0002

2

GPIO, MDIO, SMBus, PMBus, and I2C

Some important reminders regarding the LSF0002 are as follows:

• LSF devices are switch-based, not buffer-based (for more information, see the TXB family for buffer-based

devices).

• Specific data rates cannot be calculated by using 1/Tpd.

• VEXT,A/VEXT,B are referenced to the external power supplies at the I/Os.

• VBIAS should be tied towards the lowest voltage being translated to at the I/Os.

8.2 Typical Applications

8.2.1 Open-Drain Interface (I2C, PMBus, SMBus, and GPIO)

1.8 ± 10% V

B1

B2

A1

A2

GND

LSF0002

RA1 =

1k

RA2 =

1k

1.8V Device

1.2V Device

1.2 ± 10% V

VBIAS

0.1 F

RB1 =

1k

RB2 =

1k

6

5

2

1

3

4

VEXT,A

VEXT,B

Figure 8-1. Typical Application Circuit for Open-Drain Translation (MDIO Shown as an Example)

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LSF0002

SDLS975 – APRIL 2024

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