Texas Instruments ISO1176T Isolated Profibus RS-485 Transceiver

Texas Instruments (TI) announced the ISO1176T isolated half-duplex differential line transceiver with integrated transformer driver. The TI ISO1176T provides the primary voltage for an isolation transformer. The ISO1176T offers the smallest isolated signal and power system design with highest efficiency and lowest electromagnetic interference (EMI). The 16-pin SOIC ISO1176T is available now for $3.30 (in quantities of 1,000). Two other isolated full-duplex RS-485 transceivers with transformer drivers, one operating at 5 V and other operating at 3.3 V, will be available by the end of this quarter.

Texas Instruments (TI) ISO1176T isolated half-duplex differential line transceiver with integrated transformer driver

TI ISO1176T Features

  • 4000Vpeak isolation, 560Vpeak VIORM
  • Meets or exceeds the requirements of EN 50170 and TIA/EIA RS-485
  • Differential output exceeds 2.1V (54OΩ load)
  • Low bus capacitance 10pF (MAX)
  • 50kV/µs typical transient immunity
  • UL 1577, IEC 60747-5-2 (VDE 0884, Rev. 2) — approvals pending
  • Fail-safe receiver for bus open, short, or idle
  • Uses SiO2 as isolation dielectric
  • More than double the reliability and lifetime of magnetic or optical isolation techniques
  • Provides 2500 Vrms of isolation between the line transceiver and logic-level interface
  • Reduces risk of data corruption and damage to expensive control circuits over long transmission lines
  • Integrated transformer driver in the transceiver
  • Component reduction and board space savings of 20% (compared to other solutions)
  • Operates at 40 Mbps (more than twice that of the nearest competitor)
  • Supports 160 nodes
  • Reduces the number of repeaters required and system cost
  • Compatible with regulators like TI’s TPS76350 low-dropout (LDO) voltage regulator
  • Ideal for Profibus systems, factory and building automation, networked sensors, motor/motion control, HVAC, and networked security stations

More information: TI ISO1176T Isolated Profibus RS-485 Transceiver (pdf)