The ISL32490E, ISL32492E, ISL32493E, ISL32495E, ISL32496E, and ISL32498E are fault protected, 5V powered, differential transceivers that exceed the RS-485 and RS-422 standards for balanced communication. The RS-485 transceiver pins (driver outputs and receiver inputs) are fault protected up to ±60V and are protected against ±16. 5kV ESD strikes without latch-up. Additionally, the extended Common-Mode Range (CMR) allows these transceivers to operate in environments with common-mode voltages up to ±25V (>2x the RS-485 requirement), making this fault protected RS-485 family one of the most robust on the market. The transmitters (Tx) deliver an exceptional 2. 5V (typical) differential output voltage into the RS-485 specified 54Ω load. This yields better noise immunity than standard RS-485 ICs, or allows up to six 120Ω terminations in star network topologies. The receiver (Rx) inputs feature a full fail-safe design that ensures a logic high Rx output if the Rx inputs are floating, shorted, or on a terminated but undriven (idle) bus. The Rx outputs have high drive levels; typically, 15mA at VOL = 1V (for opto-coupled, isolated applications). Half duplex (Rx inputs and Tx outputs multiplexed together) and full duplex pinouts are available. See Table 1 on page 3 for key features and configurations by device number. For fault protected or wide common-mode range RS-485 transceivers with cable invert (polarity reversal) pins, see the ISL32483E datasheet.


  • Fault protected RS-485 bus pins: up to ±60V
  • Extended CMR: ±25V (more than twice the range required for RS-485)
  • ±16.5kV HBM ESD protection on RS-485 bus pins
  • 1/4 unit load for up to 128 devices on the bus
  • High transient overvoltage tolerance: ±80V
  • Full fail-safe (open, short, terminated) RS-485 receivers
  • High Rx IOL for opto-couplers in isolated designs
  • Hot plug circuitry; Tx and Rx outputs remain three-state during power-up/power-down
  • Choice of RS-485 data rates: 250kbps to 15Mbps
  • Low quiescent supply current: 2.3mA
  • Ultra low shutdown supply current: 10μA




  • Utility Meters/Automated Meter Reading Systems
  • High Node Count RS-485 Systems
  • PROFIBUS™ and RS-485 Based Field Bus Networks, and Factory Automation
  • Security Camera Networks
  • Building Lighting and Environmental Control Systems
  • Industrial/Process Control Networks


Type Title Date
Datasheet PDF 1.42 MB
Training PDF 719 KB
Training PDF 762 KB
Brochure PDF 5.20 MB 日本語
Training PDF 208 KB
Brochure PDF 2.95 MB
Brochure PDF 11.35 MB 日本語 , 简体中文
Training PDF 405 KB
Training PDF 239 KB
Technical Brief PDF 266 KB 简体中文
Application Note PDF 365 KB
Application Note PDF 207 KB
Application Note PDF 474 KB
Application Note PDF 366 KB
Technical Brief PDF 188 KB
Report PDF 438 KB
Product Change Notice PDF 266 KB
Application Note PDF 178 KB
Price Increase Notice PDF 208 KB
Other PDF 156 KB
White Paper PDF 246 KB 简体中文
Application Note PDF 513 KB
Application Note PDF 826 KB
Other PDF 253 KB
Application Note PDF 443 KB
Application Note PDF 582 KB
Application Note PDF 440 KB
Product Change Notice PDF 545 KB
Product Change Notice PDF 152 KB
Product Change Notice PDF 117 KB
Application Note PDF 338 KB
Application Note PDF 365 KB
Application Note PDF 375 KB
Other PDF 254 KB
Application Note PDF 559 KB
35 items

Design & Development



Type Title Date
Model - IBIS IBS 28 KB
1 item