MAX14949

5kVRMS隔离、500kbps半双工、RS-485/RS-422收发器,具有±30kV ESD保护和集成变压器驱动器

业界最可靠的隔离RS-485


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说明

MAX14949为一颗隔离型RS-485/RS-422收发器,为器件的电缆侧(RS-485驱动器/接收器侧)和UART侧之间提供5000VRMS (60s)电隔离。对于那些端口间地电位差大,通过隔离断开接地环路降低噪声提高通信性能。器件支持高达500kbps的可靠通信。

器件包括集成了一个450kHz变压器驱动器,可以为使用外部变压器将功率传递至收发器的电缆侧。一个内置的LDO为IC的电缆侧供电提供了一个结构简单高效解决方案。

器件包括一路半双工驱动器/接收器通道。接收器为1/8单位负载,允许一条共用总线上挂接多达256个收发器。

集成真失效保护电路确保在输入短路或开路时,接收器输出为逻辑高电平。当电缆侧或UART侧电源低于工作电平时,欠压锁定功能禁用驱动器。

驱动器输出/接收器输入具有高达±35kV对电缆侧GNDB的静电放电(ESD)保护,符合人体模式(HBM)要求。

MAX14949采用宽体16引脚SOIC封装,工作在-40°C至+85°C温度范围。
MAX14949: Functional Diagram MAX14949: Functional Diagram 放大+

关键特性

  • 高度集成简化设计
    • 集成LDO用于电缆侧电源
    • 集成变压器驱动器,将电源传递至电缆侧,150mA负载时的效率高达80%
  • 高性能收发器支持灵活的设计
    • 兼容RS-485 EIA/TIA-485标准
    • 500kbps (最大值)数据率
    • 总线上允许挂接多达256片器件
  • 集成保护,达到可靠的通信
    • 驱动器输出/接收器输入上具有±30kV ESD (HBM)保护
    • 5kVRMS隔离耐压,可持续60秒(VISO)
    • 1200VPEAK最大重复峰值隔离电压(VIORM)
    • 848VRMS最大工作隔离电压(VIOWM)
    • 额定工作电压下的寿命长于30年
    • 承受±10kV浪涌,符合IEC 61000-4-5标准
    • 热关断

应用

  • HVAC
  • 工业自动控制
  • 电表
  • 可编程逻辑控制器
Part NumberTx/RxDuplexVSUPPLY
(V)
Galvanic Isolation
(±V)
ICC
(mA)
Data Rate
(kbps)
ESD Protect.
(±kV)
Tx ENRx ENRx/Tx on BusRx Failsafe w/ InputsOper. Temp.
(°C)
Package/PinsBudgetary
Price
typminSee Notes
MAX14949 1Tx + 1RxHalf550004.750030NoNo256None-40 to +85
SOIC HYBRID (W)/16
$4.70 @1k
查看所有RS-485/RS-422 Line Driver/Receivers (206)
Pricing Notes:
价格仅供参考,用于同类产品的比较。所提供报价为美元,需要依汇率折合成人民币。该价格将因当地关税、税率和汇率而异。有关特定订购量和指定版本的报价和供货问题,请参考:价格与供货网站或与指定代理商联系。


MAX149X2EVKIT: MAX14940/MAX14943/MAX14946/MAX14949评估板

质量和环境数据

申请可靠性报告: MAX14949 
无铅封装的锡(Sn)晶须报告
型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C  

备注: 通过技术手段对故障率进行汇总,并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

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类型 编号 标题
评估板8933MAX149X2EVKIT MAX14940/MAX14943/MAX14946/MAX14949评估板