Vref_A

Vref_B

2

7

3

4

8 EN

6

5

1

GND

A1

A2

B1

B2

LSF0102

200KΩ

ON

Off

Rpu

Rpu Rpu

Vref(A) = 1.2V

Vpu1 = 3.3V

GND

3.3V enable signal

Vpu3 = 2.5V

Rpu

GND

Vcc

GPIO3

Vcc

GPIO1

GPIO2

SW

SW

Vcc

GPIO4

12

LSF0101, LSF0102, LSF0108

SDLS966G – DECEMBER 2013 – REVISED FEBRUAURY 2016

www.ti.com

Product Folder Links: LSF0101 LSF0102 LSF0108

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Copyright © 2013–2016, 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

The LSF devices are able to perform 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

Channel Number

Interface

LSF0101

1

GPIO

LSF0102

2

LSF0108

8

9.2 Typical Application

Figure 6. Bidirectional Translation to Multiple Voltage Levels

9.2.1.1 Design Requirements

9.2.1.1.1

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.