如果在I2C总线上使用不同电压的器件,那么可以使用中继器、多路复用器和开关等进行电平转换,如果您不想用那些器件,可以使用NXP提供的专用I2C电平转换器件。这些芯片还可用作通用的电平转换。

NTS系列是带自动方向感应的双电源转换收发器,可使能双向电压电平转换,同时具有开漏,内置上拉电阻,高Sink电流能力。
GTL系列是GTL-/GTL/GTL+采样接收器或用作LVTTL至GTL-/GTL/GTL+驱动器,具有自动感应控制和双电源供应。
NVT系列是在开漏或推挽应用中进行1.0 V和5 V之间的双向电压带自动感应变换而无需方向引脚,但需要外部上拉。
NTB系列带自动方向感应的双电源转换收发器,可使能双向电压电平转换,该器件完全适合使用IOFF的局部掉电应用。IOFF电路可禁用输出,防止断电时破坏性回流电流通过该器件。

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Bi-directional VLT with Diretional Pin

ProductsFunctionVoltage Translation Range (V)TTL Drive (mA)GTL Drive (mA)ApplicationPackage Options
GTL2012DP2 bit Bi-Directional Non-Latched1.14 to 1.65 ~ 3.0 to 5.51640Processor InterfaceTSSOP
GTL2014PW4 bitBi-Directional Non-Latched1.14 to 1.65 ~ 3.0 to 5.51640Processor InterfaceTSSOP
GTL2018PW8 bitBi-Directional Non-Latched1.14 to 1.65 ~ 3.0 to 5.51640Processor InterfaceTSSOP

Bi-directional VLT without Diretional Pin

ProductsNumber of bitsVCCA (min)VCCB (min)RON (typ) ΩData Rate (typ) MbsOne ShotBufferFunctionPackage Options
NVT2002211.83.5NoNoOpen Drain OutputTSSOP8, XSON8U
NVT2008811.83.5NoNoOpen Drain OutputTSSOP20, DHVQFN20
NTB010221.2 to 3.61.65 to 5.5100NoYesWeak output, overdrive inputTSSOP8, XSON8, XQFN10
NTB010441.2 to 3.61.65 to 5.5100NoYesWeak output, overdrive input, OE active highDHVQFN14, XQFN12, WLCSP12
NTS010221.65 to 3.32.3 to 5.550YesNoOpen Drain Output with rise time acceleratorTSSOP8, XSON8,XSON8U, XQFN10,XQFN8
NTS010441.65 to 3.32.3 to 5.550YesNoOpen Drain Output with rise time acceleratorTSSOP14, DHVQFN14, XQFN12, WLCSP12

VLT by Application

productsDescriptionHost CPU I/O VoltageSIM power supplyESD protectionPackage
NVT4555SIM card voltage level translator with LDO1.1V to 3.6V1.8V, 2.95V8kVCSP
NVT4556 (A and B)SIM card voltage level translator with I2C-bus control andLDO1.55V to 3.6V1.8V, 3.0V8kVCSP
NVT4857SD 3.0-SDR104 compliant, auto-direction control memory card voltage leveltranslator1.2V to 1.8V1.7V to 1.95V8kVCSP
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