TI's THVD2450 ±70 V Fault-Protected Transceiver

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Texas Instruments' THVD2450 is a ±70 V fault-protected, half-duplex RS-485 transceiver that operates on a single 3 V to 5.5 V supply. The bus interface pins are protected against overvoltage conditions during modes of operation to ensure robust communication in rugged industrial environments.

This transceiver device features integrated IEC ESD protection eliminating the need for external system-level protection components. The extended ±25 V input common-mode range provides reliable data communication over longer cable run lengths and/or in the presence of large ground loop voltages. Enhanced 250 mV receiver hysteresis ensures high noise rejection. The receiver's failsafe feature offers a logic high when the inputs are open or shorted together.

The THVD2450 device is available in small VSSOP and VSON packages making it suitable for space-constrained applications. These devices are characterized over an ambient free-air temperature range of -40°C to +125°C.

Features
  • Meets or exceeds the requirements of the TIA/EIA-485A standards
  • Supply voltage: 3 V to 5.5 V
  • Differential output exceeds 2.1 V for PROFIBUS compatibility with 5 V supply
  • Bus I/O protection:
    • DC bus fault: ±70 VDC
    • HBM ESD: ±16 kV
    • IEC 61000-4-2 contact discharge: ±12 kV
    • IEC 61000-4-2 air-gap discharge: ±12 kV
    • IEC 61000-4-4 fast transient burst: ±4 kV
  • Half-duplex device with a speed grade of 50 Mbps
  • Extended ambient temperature range: -40°C to +125°C
  • Extended operational common-mode range: ±25 V
  • Enhanced receiver hysteresis for noise immunity
  • Low power consumption
  • 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)
  • Packages: small VSON and VSSOP to save board space and the SOIC for drop-in compatibility
Applications
  • Motor drives
  • Factory automation and controls
  • HVAC systems
  • Building automation
  • Grid infrastructure
  • Electricity meters
  • Process analytics
  • Video surveillance
  • Seismic test equipment