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-Q1

Vpu_2 = 1.8 V

Vrev_A = 1.8 V Vrev_B = 3.3 V

Vpu_1 = 3.3 V

12

LSF0204-Q1

SLVSEM4 – JUNE 2018

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Product Folder Links: LSF0204-Q1

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Copyright © 2018, Texas Instruments Incorporated

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. Customers should

validate and test their design implementation to confirm system functionality.

9.1 Application Information

LSF0204-Q1 performs voltage translation for open-drain or push-pull interface. Table 2 provides examples of

interfaces as reference in regards to the different channel numbers that are supported by the LSF0204-Q1.

Table 2. Voltage Translator by Interface

PART NAME

CHANNEL

NUMBER

INTERFACE

LSF0204-Q1

4

Push Pull: GPIO, SPI, I2S, UART, JTAG, SD

9.2 Typical Applications

Figure 8. Bidirectional Translation to Multiple Voltage Levels

9.2.1.1 Design Requirements

9.2.1.1.1

Enable, Disable, and Reference Voltage Guidelines

The LSF0204-Q1 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 LSF0204-Q1 is switch-type voltage translator, the power consumption is very

low. It is recommended to always enable LSF0204-Q1 for bidirectional application (I2C, SMBus, PMBus, or

MDIO).