9 Applications 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 LSF0108-Q1 device can perform voltage translation for open-drain or push-pull interface. Table 9-1 provides

some consumer or telecom interfaces as reference to the different channel numbers that are supported by the

LSF0108-Q1.

Table 9-1. Voltage Translator for Consumer or Telecom Interface

Part Name

Channel Number

Interface

LSF0108-Q1

8

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

Some important reminders regarding the LSF family of devices are as follows:

• LSF devices are switch-based, not buffer-based (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

200 kΩ resistor

9.2 Typical Application

9.2.1 I2C PMBus, SMBus, GPIO

Vref_A

Vref_B

EN

A1

A2

B1

B2

LSF0108-Q1

200 k

Vcc

Vcc

Rpu

GPIO

GPIO

GPIO

GPIO

Vref(A) = 1.8 V

Vpu = 5.0 V

Rpu

Rpu

Vpu = 3.3 V

GPIO

GPIO

1.8 V

A3

A4

B3

B4

A5

A6

B5

B6

SCL

SDA

GPIO

GPIO

MDIO

MDC

SCL

SDA

MDIO

MDC

Rpu

Rpu

SW

SW

SW

SW

SW

SW

SW

SW

Vcc

Figure 9-1. Bidirectional Translation to Multiple Voltage Levels

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LSF0108-Q1

SDLS967F – MAY 2016 – REVISED APRIL 2023

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