MAX22028F

Compact, Isolated, Half-Duplex RS-485/RS-422 Transceivers with AutoDirection Control

Tiny, Isolated RS-485/RS-422 Transceiver


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说明

The MAX22025–MAX22028/MAX22025F–MAX22028F compact isolated RS-485/ RS-422 transceivers provide 3.5kVRMS of digital galvanic isolation between the cable-side (RS-485/RS-422 driver/ receiver-side) and the UART-side of the device. Isolation improves communication by breaking ground loops and reduces noise when there are large differences in ground potential between ports. These devices allow for robust communication up to 0.5Mbps or 16Mbps.

The MAX22025–MAX22028/MAX22025F–MAX22028F feature Maxim’s proprietary AutoDirection control making these devices ideal for applications such as isolated RS-485 ports, where the driver input is used in conjuction with the driver-enable signal to drive the differential bus.

The MAX22025/MAX22027/MAX22025F/MAX22027F feature reduced slew rate drivers that minimize EMI and reduce reflections caused by improper termination of cable allowing error-free transmission up to 0.5Mbps. The MAX22026/MAX22028/MAX22026F/MAX22028F driver outputs are not slew-rate limited, allowing transmit speeds up to 16Mbps.

The receiver output of the MAX22025/MAX22026/MAX22025F/MAX22026F does not follow (VA-VB) when the device is in the driverenabled state. The receiver output on the MAX22027/MAX22028/MAX22027F/ MAX22028F always follows (VA-VB).

The driver outputs and receiver inputs are protected from ±10kV electrostatic discharge (ESD) to GNDB on the cable side, as specified by the Human Body Model (HBM). The MAX22025–MAX22028/MAX22025F–MAX22028F are available in a compact 8-pin wide body SOIC package and operate over the -40°C to +85°C temperature range.

MAX22025, MAX22025F, MAX22026, MAX22026F, MAX22027, MAX22027F, MAX22028, MAX22028F: Functional Diagram MAX22025, MAX22025F, MAX22026, MAX22026F, MAX22027, MAX22027F, MAX22028, MAX22028F: Typical Operating Circuit 放大+

关键特性

  • High-Level Integration Reduces Overall Solution Size
    • Fully Isolated Half-Duplex RS-485/RS-422 Transceivers
    • Compact 8-Pin Wide Body SOIC Package (5.5mm Creepage)
  • Integrated Protection Ensures Robust Communication
    • ±10kV ESD (HBM) on Driver Outputs/Receiver Inputs
    • Failsafe Receiver Prevents Fault Transition on Receiver Input Short or Open Events (MAX22025F– MAX22028F)
    • Withstands 3.5kVRMS Isolation Voltage for 60 Seconds (VISO)
    • Withstands 630VPEAK Maximum Repetitive Peak- Isolation Voltage (VIORM)
    • Continuously Withstands 445VRMS Maximum Working-Isolation Voltage (VIOWM)
  • Enables Flexible System Design
    • 0.5Mbps Maximum Data Rate with Slew-Rate Limited Driver (MAX22025/MAX22027/MAX22025F/MAX22027F)
    • 16Mbps Maximum Data Rate ((MAX22026/MAX22028/MAX22026F/MAX22028F)
    • AutoDirection Eliminates the Need for DE and Active-Low RE Control Signals

应用

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Part NumberTx/RxDuplexVSUPPLY
(V)
Galvanic Isolation
(±V)
Data Rate
(kbps)
ESD Protect.
(±kV)
Tx ENRx ENRx/Tx on BusRx Failsafe w/ InputsSlew Rate LimitingOper. Temp.
(°C)
Package/PinsBudgetary
Price
minSee Notes
MAX22025 NEW!1Tx + 1RxHalf5350050010NoNo32-Yes-40 to +85
SOIC (W)/8
$1.69 @1k
MAX22028 NEW!-1600024NoneNo
SOIC (W)/8
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。


MAX2202XEVKIT: Evaluation Kit for the MAX22025, MAX22026, MAX22027, MAX22028

质量和环境数据

申请可靠性报告: MAX22028F 
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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