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  • THVD24x2 ±70V Fault-Protected 3V to 5.5V Full Duplex RS-485 Transceivers With IEC ESD

    • SLLSFR1A November   2023  – March 2024 THVD2412 , THVD2442

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  • THVD24x2 ±70V Fault-Protected 3V to 5.5V Full Duplex RS-485 Transceivers With IEC ESD
  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  ESD Ratings [IEC]
    4. 5.4  Recommended Operating Conditions
    5. 5.5  Thermal Information
    6. 5.6  Power Dissipation
    7. 5.7  Electrical Characteristics
    8. 5.8  Switching Characteristics_250kbps
    9. 5.9  Switching Characteristics_20Mbps
    10. 5.10 Typical Characteristics
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagrams
    3. 7.3 Feature Description
      1. 7.3.1 ±70-V Fault Protection
      2. 7.3.2 Integrated IEC ESD and EFT Protection
      3. 7.3.3 Driver Overvoltage and Overcurrent Protection
      4. 7.3.4 Enhanced Receiver Noise Immunity
      5. 7.3.5 Receiver Fail-Safe Operation
      6. 7.3.6 Low-Power Shutdown Mode
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
        1. 8.2.1.1 Data Rate and Bus Length
        2. 8.2.1.2 Stub Length
        3. 8.2.1.3 Bus Loading
        4. 8.2.1.4 Transient Protection
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Third-Party Products Disclaimer
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information
  13. IMPORTANT NOTICE

Package Options

Mechanical Data (Package|Pins)
  • DRC|10
    • MPDS117L
Thermal pad, mechanical data (Package|Pins)
  • DRC|10
    • QFND013N
Orderable Information
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  • sllsfr1a_pm
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Data Sheet

THVD24x2 ±70V Fault-Protected 3V to 5.5V Full Duplex RS-485 Transceivers With IEC ESD

1 Features

  • Meets or exceeds the requirements of the TIA/EIA-485A and TIA/EIA-422B standards
  • 3V to 5.5V supply voltage
  • Differential output exceeds 2.1V for PROFIBUS compatibility with 5V supply
  • Bus I/O protection
    • ±70V DC bus fault
    • ±16kV HBM ESD
    • ±8kV IEC 61000-4-2 contact discharge
    • ±8kV IEC 61000-4-2 air-gap discharge
    • ±4kV IEC 61000-4-4 fast transient burst
  • Full-duplex devices available in two speed grades
    • THVD2412: 250kbps
    • THVD2442: 20Mbps
  • Extended ambient temperature range: -40°C to 125°C
  • Extended operational common-mode range: ±25V
  • Enhanced receiver hysteresis for noise immunity
  • Low power consumption
    • Low shutdown supply current: < 10µA
    • Current during operation: < 5.6mA
  • Glitch-free power-up/down for hot plug-in capability
  • Open, short, and idle bus failsafe
  • Thermal shutdown
  • 1/8 unit load (up to 256 bus nodes) in - 7V to 12V common mode range
  • Small 3mm x 3mm VSON package to save board space

2 Applications

  • Motor drives
  • Factory automation and control
  • HVAC systems
  • Building automation
  • Grid infrastructure
  • Electricity meters
  • Process analytics
  • Video surveillance

3 Description

THVD2412 and THVD2442 are ±70V fault-protected, full-duplex, RS-422/RS-485 transceivers operating on a single 3V to 5.5V supply. Bus interface pins are protected against overvoltage conditions during all modes of operation ensuring robust communication in rugged industrial environments.

These devices feature integrated IEC ESD protection, eliminating the need for external system-level protection components. Extended ±25V input common-mode range ensures reliable data communication over longer cable run lengths and/or in the presence of large ground loop voltages. Enhanced 250mV receiver hysteresis provides high noise rejection. In addition, the receiver fail-safe feature provides a logic high when the bus inputs are open or shorted together.

THVD24x2 devices are available in small and thermally efficient VSON packages for space-constrained applications. These devices are characterized over ambient temperature from –40°C to 125°C.

Package Information
PART NUMBERPACKAGE(1)PACKAGE SIZE(2)
THVD2412
THVD2442		VSON (10)3mm × 3mm
(1) For more information, see Section 11.
(2) The package size (length × width) is a nominal value and includes pins, where applicable.
GUID-20231107-SS0I-N4GS-HW5Z-TFX8FFCTMZF3-low.svg THVD2412 and THVD2442 Simplified Schematic

4 Pin Configuration and Functions

Figure 4-1 DRC (VSON), 10-Pin Package, Top View
Table 4-1 Pin Functions
PIN TYPE DESCRIPTION
NAME DRC
R 1 Digital output Receive data output
RE 2 Digital input Receiver enable input; integrated weak pull-up (~2 MΩ)
DE 3 Digital input Driver enable input; integrated weak pull-down (~2 MΩ)
D 4 Digital input Transmission data input; integrated weak pull-up (~2 MΩ)
GND 5 Ground Local Device ground
Y 6 Bus output Driver non-inverting output
Z 7 Bus output Driver inverting output
B 8 Bus input Receiver inverting bus input
A 9 Bus input Receiver non-inverting bus input
VCC 10 Power 3 V to 5.5 V supply voltage
Thermal Pad — — No electrical connection. Should be connected to GND plane for optimal thermal performance

 
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