EN

A1

A2

B1

B2

Vcc

Rpu

Rpu

SDA

SCL

Vcc

SDA

SCL

GND

Rpu

Rpu

A3

A4

B3

B4

ON

Off

1.8 V

enable signal

SW

SW

SW

SW

LSF0204

Vpu_2 = 1.8 V

Vrev_A = 1.8 V Vrev_B = 3.3 V

Vpu_1 = 3.3 V

LSF0204, LSF0204D

SLVSCP5D – JULY 2014 – REVISED DECEMBER 2015

www.ti.com

11 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. Customers should

validate and test their design implementation to confirm system functionality.

11.1 Application Information

LSF performs voltage translation for open-drain or push-pull interface. Table 2 provides some consumer/telecom

interfaces as reference in regards to the different channel numbers that are supported by the LSF family.

Table 2. Voltage Translator for Consumer/Telecom Interface

PART NAME

CH#

INTERFACE

LSF0101

1

GPIO

LSF0102

2

GPIO, MDIO, SMBus, PMBus, I2C

LSF0204

4

GPIO, SPI. MDIO, SMBus, PMBus, I2C, UART, SVID

LSF0108

8

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

11.2 Typical Applications

Figure 9. Bidirectional Translation to Multiple Voltage Levels

11.2.1.1 Design Requirements

11.2.1.1.1

Enable, Disable, and Reference Voltage Guidelines

The LSF family has an EN input that is used to disable the device by setting EN LOW, which places all I/Os in

the high-impedance state. Since LSF family is switch-type voltage translator, the power consumption is very low.

It is recommended to always enable LSF family for bidirectional application (I2C, SMBus, PMBus, or MDIO).

12

Submit Documentation Feedback

Copyright © 2014–2015, Texas Instruments Incorporated

Product Folder Links: LSF0204 LSF0204D