7 Detailed Description

7.1 Overview

The LSF family can be used in level-translation applications for interfacing devices or systems operating with

one another that operate at different interface voltages. The LSF family is ideal for use in applications where an

open-drain driver is connected to the data I/Os. With appropriate pull-up resistors and layout, LSF can achieve

100MHz. The LSF family can also be used in applications where a push-pull driver is connected to the data I/Os.

For an overview of device setup and operation, see The Logic Minute training series on Understanding the LSF

Family of Bidirectional, Multi-Voltage Level Translators.

7.2 Functional Block Diagram

VREFA

2

7

VREFB

SW

EN

8

B1

SW

A1

B2

A2

3

4

6

5

GND

1

7.3 Feature Description

7.3.1 Auto Bidirectional Voltage Translation

The device is an auto bidirectional voltage level translator that is operational from 0.95 to 5.5V on Vref_A and 1.8

to 5.5V on Vref_B. This allows bidirectional voltage translation between 0.95V and 5.5V without the need for a

direction pin in open-drain or push-pull applications. The LSF family supports level translation applications with

transmission speeds greater than 100 Mbps for open-drain systems using a 30-pF capacitance and 250-Ω pullup

resistor. Both the output driver of the controller and the peripheral device output can be push-pull or open-drain

(pull-up resistors may be required). In both up and down translation, the B-side is often referred to as the high

side and refers to devices connected to the B ports. The A-side can be referred to as the low side.

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LSF0102

SDLS972B – APRIL 2023 – REVISED APRIL 2024

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Product Folder Links: LSF0102