MAX14858

5kVRMS Isolated 500kbps/25Mbps Full-Duplex RS-485/RS-422 Transceivers with ±35kV ESD Protection

Industry's Most Robust Isolated RS-485


Description

The MAX14856/MAX14858 isolated RS-485/RS-422 transceivers provide 5000VRMS (60s) of 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 500kbps (MAX14856) or 25Mbps (MAX14858).

The devices include one drive channel and one receive channel. The receiver is 1/4-unit load, allowing up to 128 transceivers on a common bus.

Integrated true fail-safe circuitry ensures a logic-high on the receiver output when inputs are shorted or open. Undervoltage lockout disables the driver when the cable side or UART side power supplies are below functional levels.

The driver outputs and receiver inputs are protected from ±35kV electrostatic discharge (ESD) to GNDB on the cable side, as specified by the Human Body Model (HBM).

The devices are available in a wide-body 16-pin SOIC package and operate over the -40°C to +105°C temperature range.
MAX14856, MAX14858: Functional Diagram MAX14856, MAX14858: Functional Diagram Enlarge+

Key Features

  • High-Performance Transceiver Enables Flexible Designs
    • Integrated LDO for Cable Side Power
    • Compliant with RS-485 EIA/TIA-485 Standard
    • 500kbps (MAX14856)/25Mbps (MAX14858) Maximum Data Rate
    • Allows Up to 128 Devices on the Bus
  • Integrated Protection Ensures for Robust Communication
    • ±35kV ESD (HBM) on Driver Outputs/Receiver Inputs
    • 5kVRMS Withstand Isolation Voltage for 60 Seconds (VISO)
    • 1200VPEAK Maximum Repetitive Peak-Isolation Voltage (VIORM)
    • 848VRMS Maximum Working-Isolation Voltage (VIOWM)
    • > 30 Years Lifetime at Rated Working Voltage
    • Withstands ±10kV Surge per IEC 61000-4-5
    • Thermal Shutdown

Applications/Uses

  • HVAC
  • Industrial Automation Equipment
  • Power Meters
  • Programmable Logic Controllers
Part Number Tx/Rx Duplex VSUPPLY
(V)
Galvanic Isolation
(±V)
ICC
(mA)
Data Rate
(kbps)
ESD Protect.
(±kV)
Rx/Tx on Bus Slew Rate Limiting Oper. Temp.
(°C)
Package/Pins Budgetary
Price
typ min See Notes
MAX14856 NEW! 1Tx + 1Rx Full 3.0 to 5.5 5000 4.7 500 35 128 Yes -40 to +105
SOIC HYBRID (W)/16
$3.59 @1k
MAX14858 NEW! 25000 -
SOIC HYBRID (W)/16
$4.50 @1k
See All RS-485/RS-422 Line Driver/Receivers (199)
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.


MAX148X1EVKIT: Evaluation Kit for the MAX14852/MAX14854/MAX14856 and MAX14858

Quality and Environmental Data

Request Reliability Report for: MAX14858 
Lead-Free Package Tin (Sn) Whisker Reports

Related Resources


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