Datasheet > G3403

G3403

更新时间： 2024-11-16 17:01:23

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描述
1-Bit, 2-Bit Bidirectional I2C Bus & Voltage-Level Shift, Open drain Input/Ouput

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G3403 数据手册

G3403

Global Mixed-mode Technology

Bidirectional I²C Bus and SMBus Voltage Level

Translator

EN is low, the translator switch is off, and a

high-impedance exists between ports.

Features

1-Bit Bidirectional Translator

I²C and SMBus Compatible

In I²C applications, the bus capacitance limit of 400pF

restricts the number of devices and bus length. The

system designer could isolate two halves of a bus by

using the G3403; thus, more I²C devices or longer

trace length can be accommodated.

Less than 1.5ns Maximum Propagation Delay to

Accommodate Standard-Mode and Fast-Model

I²C Devices and Multiple Masters

Allows Voltage-Level Translator Between

1.2V V_REF1and 2.5V, 3.3V, 5V V_REF2

1.8V V_REF1and 3.3V, 5V V_REF2

3.3V V_REF1and 5V V_REF2

Provides Bidirectional Voltage Translation

without Direction Pin

In standard I²C system, pull-up resistors are required

to provide the logic high levels on the translator’s bus.

The size of these pull-up resistors depends on the

system, but each side of the repeater must have a

pull-up resistor. The G3403 is designed to work with

standard-mode and fast-mode I²C devices. Standard

mode I²C devices only specify 3mA in a generic I²C

system where standard mode devices and multiple

masters are possible. Under certain conditions, high

termination currents can be used.

Low 3.5Ω ON-State Connection Between Input

and Output Ports Provides Less Signal Distortion

Open-Drain I²C I/O Ports

5V Tolerant I²C I/O Ports to Support Mixed

Mode Signal Operation

High Impedance for SCL1 and SCL2 as EN=Low

Lock-up-Free Operation for Isolation When

EN=Low

When the SCL1 or SCL2 port is low, the clamp is in

the ON state, and a low resistance connection exists

between the SCL1 and SCL2 ports. Assuming the

higher voltage is on the SCL2 port, when the SCL2

port is high, the voltage on the SCL1 port is limited to

the voltage set by V_REF1. When the SCL1 is high, the

SCL2 port is pulled up to the drain pull-up supply volt-

age (V_DPU) by pull-up resistors. This function allows a

seamless translation between higher and lower volt-

ages selected by the user, without any directional con-

trol.

General Description

The G3403 is a bidirectional I²C and SMBUS volt-

age-level translator with an enable (EN) input, and is

operational from 1.2V to 3.3V V_REF1and 2.5V to 5.5V

V_REF2. It allows bidirectional voltage translations be-

tween 1.2V and 5V, without use of directional pin. The

low ON-state resistance (r_ON) of the switch ensures the

connections to be with minimal propagation delay.

When EN is high, the translator switch is ON, and the

SCL1 I/O is connected to the SCL2 I/O, respectively,

allowing bidirectional data flow between ports. When

Ordering Information

ORDER

MARKING

NUMBER

TEMP.

RANGE

PACKAGE

(Green)

G3403TL1U

343x

-40°C to +85°C

SC-70-6 (SOT-363)

Note: TL: SC-70-6 (SOT-363)

1: Bonding Code

U: Tape & reel

Pin Configuration

G3403

VREF2

VREF1

VSS

SCL1

SCL2

SC-70-6 (SOT-363)

TEL: 886-3-5788833

http://www.gmt.com.tw

Ver: 0.1

May 29, 2013

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