LSF0102DCTR datasheet(13/53 Pages) TI

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8 Detailed Description

8.1 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

100 MHz. 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.

8.2 Functional Block Diagram

Vref_A

Vref_B

GND

8.3 Feature Description

8.3.1 Auto Bidirectional Voltage Translation

All devices in the LSF family are auto bidirectional voltage level translators that are operational from 0.95 to 4.5

V on the Vref_A supply and from 1.8 to 5.5 V on the Vref_B supply. This allows bidirectional voltage translation

between 0.95 V and 5.5 V 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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LSF0108

SDLS966L – DECEMBER 2013 – REVISED DECEMBER 2022

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LSF0102DCTR датащи(PDF) 13 Page - Texas Instruments