Datasheet > SGM4551B

SGM4551B

更新时间： 2024-10-03 11:12:55

品牌	Logo	应用领域
圣邦微 - SGMICRO		/
页数	文件大小	规格书
7页	455K
描述
Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator

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SGM4551B 数据手册

SGM4551B

Dual Bidirectional I²C Bus and

SMBus Voltage-Level Translator

GENERAL DESCRIPTION

The SGM4551B is a 2-bit, SMbus, dual, bidirectional, I²C

For the application of standard I²C, the pull-up resistor is

required for the logic high levels, which means that the

operation for I²C in this case is open-drain. Each side of the

repeater requires a pull-up resistor and the value of resistor

depends on the operation of SGM4551B. Also, when multiple

masters are connected with SGM4551B, the standard

operation current is 3mA, and high current can be taken into

account under the specific conditions.

voltage translator with the ability of enable (EN) function. For

V_REF1, the typical operation range is from 1.2V to 3.3V and the

typical operation for V_REF2is from 1.8V to 5.5V.

The signal can be transmitted bilaterally from 1.2V to 5V. The

propagation delay is significant small as the low on-resistance

of SGM4551B. Also, if the EN pin is in high position, the

voltage translator is transparent and then it allows the

connection between SCL1 and SCL2, SDA1 and SDA2

respectively. In addition, in this state, the transmitting

direction is bidirectional. However, the transmitting will be

suspended if the EN pin is in low state as the high-impedance

property at this moment.

The resistance between SDA1 and SDA2 is low when the

state of them is low. However, if the state of SDA1 or SDA2 is

high, the level of high position depends on the corresponding

voltage reference. In the transparent mode, when the position

of SDA1 is high, SDA2 must be pulled to a high level through

the pull-up resistor. In addition, the transition for high and low

voltage is seamless which can be selected by the users.

For the applications, the connections of the devices and bus

length are limited as the 400pF capacitance of the bus pin.

However, SGM4551B allows the isolation between two sides

of I²C bus so that more and more I²C devices can be added

and connected with SGM4551B.

Because of the same electrical characteristics for all the

outputs of SGM4551B, so that the deviations of the

propagation delay and voltage is extremely small. In addition,

this advantage is good for the transition of discrete transistors

as the symmetrical switch inside SGM4551B. On top of this,

SGM4551B can also provide the protection of ESD for the

devices with weak ESD ability.

Two different kinds of bus frequencies are supported by

SGM4551B, one is 400kHz and the other is 100kHz. Also, if

two frequencies for the buses are required, the priority of

400kHz should be always higher than that of 100kHz.

Because of the adding of the additional delay, the operational

frequency of the device must be lower than 400kHz if the

frequency of the master is equal to 400kHz.

The SGM4551B is available in a Green SOT-23-8 package. It

operates over an ambient temperature range of -40℃ to

+85℃.

SG Micro Corp

FEBRUARY2015–REV. A

www.sg-micro.com

12 3 4 5 6 7

中文翻译

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与SGM4551B相关器件

型号	品牌	获取价格	描述	数据表
SGM4551YXET	SGMICRO	获取价格	Dual Bidirectional I2C Bus and SMBus Voltage-Level Translator
SGM4552	SGMICRO	获取价格	1-Bit Bidirectional Voltage-Level Translator for Open-Drain and Push-Pull Applications
SGM4552X	SGMICRO	获取价格	1-Bit Bidirectional Voltage-Level Translator for Open-Drain and Push-Pull Applications
SGM4553YXET	SGMICRO	获取价格	2-Bit Bidirectional Voltage-Level Translator for Open-Drain and Push-Pull Applications
SGM4554	SGMICRO	获取价格	1-Bit Bidirectional Voltage-Level Translator with Auto Direction Sensing
SGM4556	SGMICRO	获取价格	2-Bit Bidirectional Voltage-Level Translator with Auto Direction Sensing
SGM4558	SGMICRO	获取价格	Dual SIM/Smart Card Power Supply and Interface
SGM4560	SGMICRO	获取价格	CA Card Power Supply and Level Translator
SGM4563	SGMICRO	获取价格	4-Bit Level Translator for SPI Bus or UART Interface
SGM4564	SGMICRO	获取价格	4-Bit Bidirectional Voltage-Level Translator with Auto Direction Sensing

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