CXCO4334在1.2V和5V之间进行双向电压转换启用EN输入的双向I2C和SMBUS电压电平转换器用于混合模式I2C应用中SDA和SCL线路的2位双向转换器输入和输出端口之间的低3.5Ω接通状态连接提供的信号失真

CXCO4334是一个带启用（EN）输入的双向I2 C和SMBUS电压电平转换器，工作电压范围为1.2V至3.3V VREF1和2.5V至5.5V VREF2。它允许在1.2V和5V之间进行双向电压转换，而无需使用定向引脚。开关的低导通电阻（rON）保证了连接具有最小的传播延迟。当EN高时，转换器开关打开，SCL1 I/O和SDA1 I/O分别连接到SCL2和SDA2 I/O，允许端口之间的双向数据流。当EN低时，转换器开关关闭，端口之间存在高阻抗。在I2 C应用中，400pF的总线电容限制了设备数量和总线长度。系统设计者可以使用CXCO4334隔离总线的两部分；因此，可以容纳更多的I2 C设备或更长的跟踪长度。在标准I2 C系统中，需要上拉电阻来提供转换器总线上的高电平逻辑。这些上拉电阻的大小取决于系统，但中继器的每侧都必须有上拉电阻。CXCO4334设计用于标准模式和快速模式I2 C设备。标准模式I2 C设备仅在通用i2c系统中指定3mA，其中标准模式设备和多个主设备是可能的。在某些条件下，可以使用高端接电流。当SDA1或SDA2端口低时，卡箍处于打开状态，并且低
SDA1和SDA2端口之间存在电阻连接。假设较高的电压在SDA2端口上，当SDA2端口较高时，SDA1端口上的电压限制为VREF1设置的电压。当SDA1过高时，SDA2端口被上拉电阻器拉至漏极上拉电源电压（VDPU）。此功能允许在用户选择的高电压和低电压之间无缝转换，无需任何方向控制。SCL1/SCL2通道的工作方式与SDA1/SDA2通道类似。所有通道具有相同的电特性，并且在电压或传播延迟方面，从一个输出到另一个输出的偏差最小。由于开关的制造是对称的，所以这比离散平移解有好处。
·用于混合模式I2 C应用中SDA和SCL线路的2位双向转换器
·与I 2 C和SMBus兼容
最大传播延迟小于1.5ns，以适应标准模式和快速I2 C型设备和多个主设备
允许电压电平转换器
1.2V VREF1和2.5V、3.3V、5V VREF2
1.8V VREF1和3.3V，5V VREF2
3.3V VREF1和5V VREF2
提供无方向引脚的双向电压转换
·输入和输出端口之间的低3.5Ω接通状态连接提供更少的信号失真
明排I2 C I/O端口
·5V耐受I2 C I/O端口，支持混合模式信号操作
·EN=低的高阻抗SCL1、SDA1、SCL2和SDA2引脚
·当EN=低时，无锁操作隔离

目录

1.产品概述       2.产品特点     

3.应用范围       4.技术规格书下载（PDF文档）

5.产品封装       6.电路原理图  

7.相关产品

   产品概述 返回TOP

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The CXCO4334 is a dual bidirectional I2 C and SMBUS voltage-level translator with an enable (EN) input, and is operational from 1.2V to 3.3V VREF1 and 2.5V to 5.5V VREF2 . It allows bidirectional voltage translations between 1.2V and 5V, without use of directional pin. The low ON-state resistance (rON) 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 and SDA1 I/O are connected to the SCL2 and SDA2 I/O, respectively, allowing bidirectional data flow between ports. When EN is low, the translator switch is off, and a high-impedance exists between ports. In I2 C 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 CXCO4334; thus, more I2 C devices or longer trace length can be accommodated. In standard I2 C 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 CXCO4334 is designed to work with standard-mode and fast-mode I2 C devices. Standard mode I2 C devices only specify 3mA in a generic I2 C system where standard mode devices and multiple masters are possible. Under certain conditions, high termination currents can be used. When the SDA1 or SDA2 port is low, the clamp is in the ON state, and a low resistance connection exists between the SDA1 and SDA2 ports. Assuming the higher voltage is on the SDA2 port, when the SDA2 port is high, the voltage on the SDA1 port is limited to the voltage set by VREF1. When the SDA1 is high the SDA2 port is pulled up to the drain pull-up supply voltage (VDPU) by pull-up resistors. This function allows a seamless translation between higher and lower voltages selected by the user, without any directional control. The SCL1/SCL2 channel works like the SDA1/SDA2 channel. All channels have the same electrical characteristics, and there is minimal deviation from one output to another in voltage or propagation delay. This is a benefit over discrete translation solutions, since the fabrication of the switch is symmetrical.

   产品特点 返回TOP

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„ 2-Bit Bidirectional Translator for SDA and SCL Lines in Mix-Mode I2 C Applications 

„ I 2 C and SMBus Compatible 

„ Less than 1.5ns Maximum Propagation Delay to Accommodate Standard-Mode and Fast-Model I2 C Devices and Multiple Masters 

„ Allows Voltage-Level Translator Between 

Š 1.2V VREF1 and 2.5V, 3.3V, 5V VREF2 

Š 1.8V VREF1 and 3.3V, 5V VREF2 

Š 3.3V VREF1 and 5V VREF2 

„ Provides Bidirectional Voltage Translation without Direction Pin 

„ Low 3.5Ω ON-State Connection Between Input and Output Ports Provides Less Signal Distortion 

„ Open-Drain I2 C I/O Ports 

„ 5V Tolerant I2 C I/O Ports to Support Mixed Mode Signal Operation 

„ High Impedance SCL1,SDA1,SCL2 and SDA2 Pins for EN=Low 

„ Lock-up-Free Operation for Isolation When EN=Low

   应用范围 返回TOP

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   技术规格书（产品PDF) 返回TOP 

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产品封装图 返回TOP

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电路原理图 返回TOP

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Level Shifter
Part NO.	VDD(V min.	VDD(V max.	CH	IOUT (mA)	VLOW (V)	VHIGH (V)	S/R (ns)	Note	Package
CXCO4329	6	16	5	50	0	18	25	2 Vcom buffers	TQFN5X5-32
CXCO4330	--	--	8	500	-35	35	12	VGH1-VGL 6-CH,VGH2-VGL 2-CH	TSSOP20/TQFN4X4-20
CXCO4331	2.6	5.5	10	500	-30	40	700	Gate Power	TQFN5X5-40
CXCO4332	1.2	5.5	2001-2-4	--	1.2	5	17	1-2-4-Bit Bidirectional Level Shift, Push-Pull Input/Ouput	SC70-6/SOT23-6/ AQFN1.7X2.0-12
CXCO4333	2.6	5.5	9	--	-30	40	--	N/A	TQFN5X5-40
CXCO4334	1.2	5	2	--	1.2	5	--	1-Bit, 2-Bit Bidirectional I2C Bus&Voltage-Level  Shift, Open drain Input/Ouput	SC70-6/TDFN3X2-8/ADF N3X2-8/AQFN1.5X1.5-8
CXCO4335	1.65	5	4	--	1.8	5	240	4-Bit Bidirectional Level-Shift,Open Drain Input/Ouput	WLCSP3X4-12
CXCO4336	1.2	5	1	--	1.2	5	--	1-Bit,2-Bit Bidirectional I2C Bus &Voltage-Level  Shift,Open drain Input/Ouput	SC70-6/TDFN3X2-8/ADF N3X2-8/AQFN1.5X1.5-8