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

LSF0102

2

GPIO, MDIO, SMBus, PMBus, and I2C

Some important reminders regarding the LSF family of devices 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.

• 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 200kΩ

resistor.

8.2 Typical Applications

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

Vref_A

Vref_B

2

7

3

4

8 EN

6

5

1

GND

A1

A2

B1

B2

LSF0108

Rpu

200 K

ON

Off

Rpu

Rpu

Rpu

Vref(A) = 1.8 V

Vpu = 3.3 V

GND

GND

3.3 V enable signal

Vcc

MDIO

MDC

SW

SW

Vcc

MDIO

MDC

LSF010x

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

LSF0102

SDLS972B – APRIL 2023 – REVISED APRIL 2024

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