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40Mbps, +3.3V, RS-485 Half-Duplex Transceivers

Low-Voltage, High-Speed RS-485 Transceivers Increase Data Rates and Extend Cable Lengths 

Product Details

The MAX14840E/MAX14841E are +3.3V ESD-protected transceivers intended for half-duplex RS-485 communication up to 40Mbps. These transceivers are optimized for high speeds over extended cable runs while maximizing tolerance to noise.

The MAX14840E features symmetrical fail-safe and larger receiver hysteresis, providing improved noise rejection and improved recovered signals in high-speed and long cable applications. The MAX14841E has true fail-safe receiver inputs guaranteeing a logic-high receiver output when inputs are shorted or open.

The MAX14840E/MAX14841E are available in 8-pin SO and small, 8-pin (3mm x 3mm) TDFN-EP packages. Both devices operate over the -40°C to +125°C automotive temperature range.

Key Features

  • High ESD Protection Provides Increases Equipment Uptime
    • ±35kV Human Body Model (HBM) per JEDEC JS-001-2012
    • ±20kV Air Gap Discharge per IEC 61000-4-2
    • ±12kV Contact Discharge per IEC 61000-4-2
  • Integrated Features Increases Robustness
    • Large 170mV Receiver Hysteresis (MAX14840) for High Receiver Noise Tolerance
    • True Fail Safe Receiver Input (MAX14841E) Keeps Receiver Output Logic-High Upon Shorts and Open On Receiver Input
    • Thermal Self-Protection Shutdown at 160°C Junction Temperature
    • High Industrial -40°C to +125°C Ambient Operating Temperature Range/-40°C to +150°C Junction Temperature Range
    • Hot Swap Capability Eliminates False Transition During Power-Up or Hot Insertion
  • Low Current Reduces Power Requirements
    • 10µA (max) Shutdown Current
    • 1.5mA (typ) Supply Current
    • 3.3V Supply Voltage
  • Available in Industry Standard 8-Pin SO or Space-Saving 8-Pin TDFN-EP (3mm x 3mm) Packages

Applications/Uses

  • Backplane Buses
  • Fieldbus Networks
  • HVAC Networks
  • Industrial Control Systems
  • Motion Controllers
Parametric specs for RS-485/RS-422 Line Driver/Receivers
# Tx/Rx 1Tx + 1Rx
Duplex Half
VSUPPLY (V) 3.3
Data Rate (kbps) (min) 40000
ICC (mA) (typ) 1.5
ESD Protect. (±kV) 35
Tx EN Yes
Rx EN Yes
ICC (Shutdn.) (µA) (typ) 10
Oper. Temp. (°C) -40 to +125
Package/Pins SOIC (N)/8
TDFN/8
Budgetary
Price (See Notes)
$2.21 @1k
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Simplified Block Diagram

MAX14840E, MAX14841E: Functional Diagram MAX14840E, MAX14841E: Functional Diagram Zoom icon

Technical Docs

Design & Development

Click any title below to view the detail page where available.

Description

The MAX14840PMB1 peripheral module provides the necessary hardware to interface the MAX14840E RS-485 transceiver to any system that utilizes Pmod™-compatible expansion ports configurable for a UART interface. The IC is a +3.3V ESD-protected transceiver intended for half-duplex RS-485 communication up to 40Mbps*. These transceivers are optimized for high speeds over extended cable runs, while maximizing tolerance to noise.
The IC features symmetrical fail-safe and larger receiver hysteresis, providing improved noise rejection and improved recovered signals in high-speed and long-cable applications.
Refer to the MAX14840E IC data sheet for detailed information regarding operation of the IC.

View Details

Features

  • Half-Duplex RS-485 Transceivers
  • 40Mbps Maximum Data Rate
  • Large (170mV) Receiver Hysteresis
  • Symmetrical Fail-Safe Receiver Input
  • Hot-Swap Capability
  • Short-Circuit-Protected Outputs
  • Thermal Self-Protection
  • Extended ESD Protection for RS-485 I/O Pins
  • 6-Pin Pmod-Compatible Connector (Pmod Interface Type 4 UART)
  • Example Software Written in C for Portability
  • RoHS Compliant
  • Proven PCB Layout
  • Fully Assembled and Tested

Description

Maxim Analog Essentials is a collection of peripheral modules which can plug directly into any FPGA/CPU expansion port which follows the Pmod™ standard established by Digilent, Inc. The collection includes modules containing a wide variety of commonly used analog and mixed signal functions. The modules are supported by software which includes FPGA configuration files for three popular FPGA platforms: Avnet LX-9, Digilent Nexys 3 and Avnet ZEDBoard, as well as example programs to exercise and demonstrate each module. While the example programs demonstrate the module’s functionality, they are well partitioned and documented allowing the core routines to be easily cut and pasted into your own programs. The combination of plug-in simplicity and easy software integration allows for quick migration from idea to working prototype.

View Details

Features

  • Data Converter, Interface, Clock, Sensor, and Other Modules Included to Address Many Design Needs
  • Plug in Modules Enable Rapid Hardware Prototyping
  • Proven Software Drivers Reduce Development Time
  • FPGA Configuration Files Included to Simplify Design Effort

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Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal

Parameters

Parametric specs for RS-485/RS-422 Line Driver/Receivers
# Tx/Rx 1Tx + 1Rx
Duplex Half
VSUPPLY (V) 3.3
Data Rate (kbps) (min) 40000
ICC (mA) (typ) 1.5
ESD Protect. (±kV) 35
Tx EN Yes
Rx EN Yes
ICC (Shutdn.) (µA) (typ) 10
Oper. Temp. (°C) -40 to +125
Package/Pins SOIC (N)/8
TDFN/8
Budgetary
Price (See Notes)
$2.21 @1k

Key Features

  • High ESD Protection Provides Increases Equipment Uptime
    • ±35kV Human Body Model (HBM) per JEDEC JS-001-2012
    • ±20kV Air Gap Discharge per IEC 61000-4-2
    • ±12kV Contact Discharge per IEC 61000-4-2
  • Integrated Features Increases Robustness
    • Large 170mV Receiver Hysteresis (MAX14840) for High Receiver Noise Tolerance
    • True Fail Safe Receiver Input (MAX14841E) Keeps Receiver Output Logic-High Upon Shorts and Open On Receiver Input
    • Thermal Self-Protection Shutdown at 160°C Junction Temperature
    • High Industrial -40°C to +125°C Ambient Operating Temperature Range/-40°C to +150°C Junction Temperature Range
    • Hot Swap Capability Eliminates False Transition During Power-Up or Hot Insertion
  • Low Current Reduces Power Requirements
    • 10µA (max) Shutdown Current
    • 1.5mA (typ) Supply Current
    • 3.3V Supply Voltage
  • Available in Industry Standard 8-Pin SO or Space-Saving 8-Pin TDFN-EP (3mm x 3mm) Packages

Applications/Uses

  • Backplane Buses
  • Fieldbus Networks
  • HVAC Networks
  • Industrial Control Systems
  • Motion Controllers

Description

The MAX14840E/MAX14841E are +3.3V ESD-protected transceivers intended for half-duplex RS-485 communication up to 40Mbps. These transceivers are optimized for high speeds over extended cable runs while maximizing tolerance to noise.

The MAX14840E features symmetrical fail-safe and larger receiver hysteresis, providing improved noise rejection and improved recovered signals in high-speed and long cable applications. The MAX14841E has true fail-safe receiver inputs guaranteeing a logic-high receiver output when inputs are shorted or open.

The MAX14840E/MAX14841E are available in 8-pin SO and small, 8-pin (3mm x 3mm) TDFN-EP packages. Both devices operate over the -40°C to +125°C automotive temperature range.

Simplified Block Diagram

MAX14840E, MAX14841E: Functional Diagram MAX14840E, MAX14841E: Functional Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal