8 Detailed Description

8.1 Overview

The LSF0102-Q1 device can be used in level translation applications for interfacing devices or systems

operating at different interface voltages. The LSF0102-Q1 device 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, the LSF0102-Q1

device can achieve 100 MHz. The LSF0102-Q1 can also be used in applications where a push-pull driver is

connected to the data I/Os.

8.2 Functional Block Diagram

SW

SW

LSF0102-Q1

8

6

2

7

3

4

5

EN

B1

B2

A2

A1

Vref_A

Vref_B

1

GND

8.3 Feature Description

8.3.1 Auto Bidirectional Voltage Translation

The LSF0102-Q1 device is an auto bidirectional voltage level translator that operates from 0.95 to 5.5 V on

Vref_A and 1.8 to 5.5 V on Vref_B. 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 LSF0102-Q1 device supports level

translation applications with transmission speeds greater than 100 Mbps for open-drain systems using a 250-Ω

pull-up resistor with a 30-pF capacitive load.

8.3.2 Output Enable

To enable the I/O pins, the EN input should be tied directly to Vref_B during operation and both pins must be

pulled up to the HIGH side (VCCB) through a bias resistor (typically 200 kΩ). To ensure the high impedance state

during power-up, power-down, or during operation, the EN pin must be LOW. The EN pin should always be tied

directly to the Vref_B pin and is recommended to be disabled by an open-drain driver without a pullup resistor.

This allows Vref_B to regulate the EN input and bias the channels for proper translation. A filter capacitor on Vref_B

is recommended for a stable supply at the device.

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LSF0102-Q1

SDLS969B – MAY 2018 – REVISED MAY 2023

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Product Folder Links: LSF0102-Q1