MAX22028

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

Tiny, Isolated RS-485/RS-422 Transceiver


Please check latest availability status for a specific part variant.

Description

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 Enlarge+

Key Features

  • 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

Applications/Uses

  • Utility Meters
  • Industrial Automation Equipment
  • Programmable Logic Controllers
  • HVAC

See parametric specs for RS-485/RS-422 Line Driver/Receivers (208)


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
MAX22025F NEW!--500--32Open or ShortedYes
SOIC (W)/8
$1.75 @1k
MAX22028 NEW!-516000NoNo24NoneNo
SOIC (W)/8
$1.69 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

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

Tools & Models

  • MAX22028 IBIS Model
  • Request Reliability Report for: MAX22028 
    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >

     
    Status:
    Package:
    Temperature:

    Related Resources


    MAX33072E
    +3V to +5.5V, Polarity Invert RS-485 Half-Duplex Transceiver with ±65V Fault Protection, ±40V CMR, and ±40kV ESD

    • Integrated Protection for Robust Communication
    • High-Performance Transceiver Enables Flexible Designs

    MAX33073E
    +3V to +5.5V, Polarity Invert RS-485 Half-Duplex Transceiver with ±65V Fault Protection, ±40V CMR, and ±40kV ESD

    • Integrated Protection for Robust Communication
    • High-Performance Transceiver Enables Flexible Designs

    MAX22088
    Home Bus System (HBS) Compatible Transceiver

    • High Integration Reduces BOM and Footprint
    • Configurability Enables Flexible Design
    • Integrated Protection for Robust Communication

    MAX14829
    Low Power IO-Link Device Transceiver with Dual Drivers

    • Low Power Dissipation Reduces the Thermal Footprint for Small Sensors
    • Configurability and Integration Reduce SKUs
    • Selectable Driver Integrated Protection Enables Robust Communication

    MAX33014E
    +5V, 5Mbps CAN Transceiver with ±65V Fault Protection, Fault Detection and Reporting, ±25V CMR, and ±40kV ESD Protection

    • Integrated Protection Increases Robustness
    • Family Provides Flexible Design Options
    • Fault Detection and Reporting

    MAX33015E
    +5V, 5Mbps CAN Transceiver with ±65V Fault Protection, Fault Detection and Reporting, ±25V CMR, and ±40kV ESD Protection

    • Integrated Protection Increases Robustness
    • Family Provides Flexible Design Options
    • Fault Detection and Reporting

    MAX33012E
    +5V, 5Mbps CAN Transceiver with ±65V Fault Protection, Fault Detection and Reporting, ±25V CMR, and ±40kV ESD Protection

    • Integrated Protection Increases Robustness
    • Family Provides Flexible Design Options
    • Fault Detection and Reporting

    MAX33011E
    +5V, 5Mbps CAN Transceiver with ±65V Fault Protection, Fault Detection and Reporting, ±25V CMR, and ±40kV ESD Protection

    • Integrated Protection Increases Robustness
    • Family Provides Flexible Design Options
    • Fault Detection and Reporting