MAX22025

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 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 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 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 driver outputs are not slew-rate limited, allowing transmit speeds up to 16Mbps.

The receiver output of the MAX22025/MAX22026 does not follow (VA-VB) when the device is in the driverenabled state. The receiver output on the MAX22027/ MAX22028 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 are available in a compact 8-pin wide body SOIC package and operate over the -40°C to +85°C temperature range.

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
    • 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)
    • 16Mbps Maximum Data Rate (MAX22026/MAX22028)
    • AutoDirection Eliminates the Need for DE and RE (Active Low) Control Signals

Applications/Uses

  • Utility Meters
  • Industrial Automation Equipment
  • Programmable Logic Controllers
  • HVAC
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/Pins
min
MAX22025 NEW!1Tx + 1RxHalf5350050010NoNo32-Yes-40 to +85
SOIC (W)/8
MAX22028 NEW!-1600024NoneNo
SOIC (W)/8
See All RS-485/RS-422 Line Driver/Receivers (207)
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

Quality and Environmental Data

Request Reliability Report for: MAX22025 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

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.

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Related Resources


MAX22026
Compact, Isolated, Half-Duplex RS-485/RS-422 Transceivers with AutoDirection Control

  • High-Level Integration Reduces Overall Solution Size
  • Integrated Protection Ensures Robust Communication
  • Enables Flexible System Design

MAX22025
Compact, Isolated, Half-Duplex RS-485/RS-422 Transceivers with AutoDirection Control

  • High-Level Integration Reduces Overall Solution Size
  • Integrated Protection Ensures Robust Communication
  • Enables Flexible System Design

MAX22027
Compact, Isolated, Half-Duplex RS-485/RS-422 Transceivers with AutoDirection Control

  • High-Level Integration Reduces Overall Solution Size
  • Integrated Protection Ensures Robust Communication
  • Enables Flexible System Design

MAX22028
Compact, Isolated, Half-Duplex RS-485/RS-422 Transceivers with AutoDirection Control

  • High-Level Integration Reduces Overall Solution Size
  • Integrated Protection Ensures Robust Communication
  • Enables Flexible System Design

MAX22520
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  • Robust Design for Harsh Industrial Environments
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MAX22515
IO-Link Transceiver with Integrated Protection

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MAX22503E
100Mbps Full-Duplex 3V/5V RS-485/RS-422 Transceiver with High EFT Immunity

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