MAX3535E

+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with ±15kV ESD Protection


Description

The MAX3535E/MXL1535E isolated RS-485/RS-422 full-duplex transceivers provide 2500VRMS of galvanic isolation between the RS-485/RS-422 side and the processor or control logic side. These devices allow fast, 1000kbps communication across an isolation barrier when the common-mode voltages (i.e., the ground potentials) on either side of the barrier are subject to large differences. Isolation is achieved through integrated high-voltage capacitors. The MAX3535E/MXL1535E also feature a 420kHz transformer driver that allows power transfer to the RS-485 side using an external transformer.

The MAX3535E/MXL1535E include one differential driver, one receiver, and internal circuitry to send the RS-485 signals and control signals across the isolation barrier (including the isolation capacitors). The MAX3535E/MXL1535E RS-485 receivers are 1/8 unit load, allowing up to 256 devices on the same bus.

The MAX3535E/MXL1535E feature true fail-safe circuitry. The driver outputs and the receiver inputs are protected from ±15kV electrostatic discharge (ESD) on the interface side, as specified in the Human Body Model (HBM).

The MAX3535E/MXL1535E feature driver slew-rate select that minimizes electromagnetic interference (EMI) and reduces reflections. The driver outputs are short-circuit and overvoltage protected. Other features are hot-swap capability and isolation-barrier fault detection.

The MAX3535E operates with a single +3V to +5.5V power supply. The improved secondary supply range of the MAX3535E allows the use of step-down transformers for +5V operation, resulting in considerable power savings. The MXL1535E operates with a single +4.5V to +5.5V power supply. The MXL1535E is a function-/pin-compatible improvement of the LTC1535. The MAX3535E/MXL1535E are available over the commercial 0°C to +70°C and extended -40°C to +85°C temperature ranges.
MAX3535E, MXL1535E: Typical Operating Circuit MAX3535E, MXL1535E: Typical Operating Circuit Enlarge+

Key Features

  • 2500VRMS RS-485 Bus Isolation Using On-Chip High-Voltage Capacitors
  • 1000kbps Full-Duplex RS-485/RS-422 Communication
  • +3V to +5.5V Power-Supply Voltage Range (MAX3535E)
  • +4.5V to +5.5V Power-Supply Voltage Range (MXL1535E)
  • 1/8 Unit Receiver Load, Allowing 256 Devices on Bus
  • ±15kV ESD Protection Using HBM
  • Pin-Selectable Slew-Rate Limiting Controls EMI
  • Hot-Swap-Protected Driver-Enable Input
  • Undervoltage Lockout
  • Isolation-Barrier Fault Detection
  • Short-Circuit Protected
  • Thermal Shutdown
  • Open-Line and Shorted-Line Fail-Safe Receiver Inputs

Applications/Uses

  • Industrial-Control Local Area Networks
  • Isolated RS-485 Systems
  • Systems with Large Common-Mode Voltages
  • Telecommunications Systems
Part Number Tx/Rx Duplex VSUPPLY
(V)
Galvanic Isolation
(±V)
ICC
(mA)
Data Rate
(kbps)
ESD Protect.
(±kV)
Tx EN Rx EN Rx/Tx on Bus Rx Failsafe w/ Inputs Slew Rate Limiting Oper. Temp.
(°C)
Package/Pins Budgetary
Price
typ min See Notes
MAX3535E  1Tx + 1Rx Full
3.3
3.0 to 5.5
5
2500 16 1000 15 Yes Yes 256 Open or Shorted No
-40 to +85
0 to +70
SOIC(W)/28
$6.03 @1k
MXL1535E  5 -
SOIC(W)/28
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.


MAX3535EEVKIT: MAX3535E Evaluation Kit

Tools & Models

MAX3535E IBIS Model

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Type ID Title
Evaluation Board5396MAX3535EEVKIT MAX3535E Evaluation Kit