LSF0102DDFR datasheet(16/57 Pages) TI

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9 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.

9.1 Application Information

The LSF devices are able to perform voltage translation for open-drain or push-pull interfaces. Table 9-1

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

the corresponding bit count.

Table 9-1. Voltage Translator for Common Interfaces

Part Name

Channel Number

Interface

LSF0101

GPIO

LSF0102

GPIO, MDIO, SMBus, PMBus, and I2C

LSF0108

GPIO, MDIO, SDIO, SVID, UART, SMBus, PMBus, I2C, and SPI

Please find below some important reminders regarding the LSF family of devices:

• LSF devices are switch-based, not buffer-based (please see the TXB family for buffer-based devices).

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

• VCCB/VCCA are not the same as Vref_B or Vref_A: VCCB refers to the B-side supply voltage supplied to the

LSF device, while Vref_B refers to the voltage at the Vref_B pin (pin 7 of Figure 9-1.) on the other side of the

200k resistor.

9.2 Typical Applications

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

Vref_A

Vref_B

8 EN

GND

LSF0108

Rpu

200 KΩ

Off

Rpu

Vref(A) = 1.8 V

Vpu = 3.3 V

GND

3.3 V enable signal

Vcc

MDIO

MDC

Vcc

MDIO

MDC

Figure 9-1. Typical Application Circuit for Open-Drain Translation (MDIO Shown as an Example)

LSF0108

SDLS966L – DECEMBER 2013 – REVISED DECEMBER 2022

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