The HI-485xH devices are high-speed slew-rate controlled TIA-485/TIA-422-B and ISO 8482:1993 compliant transceivers with extended temperature ranges of -55˚C to 175˚C for plastic packages and -55˚C to 200˚C for the ceramic CERDIP-8 package. The devices can operate over an extended supply (3.15V to 5.5V) and extended receiver common-mode range for high temperature and industrial control applications. The receiver input common-mode range of [-12, 15]V and ±20V for the half and full duplex configurations respectively, is valid over the full supply and temperature specification. The HI-4853H has a half-duplex configuration, and the HI-4854H and HI-4855H are full-duplex. Slew rates are optimized for data rates below 25Mbps. The drivers slew-rate control and pre-emphasis reduces high-frequency components in the output signal transitions and also compensates for impedance mismatch. These features provide optimum EMI and jitter performance, essential in EMI sensitive environments and high-integrity data link applications such as in aerospace and industrial controls. 

The devices deliver at least ± 1.50V (VDD=3.15V), and ± 2.00V (VDD= 4.5V) output levels at an extended temperature range of -55°C to +200°C into a differential load of 54Ω and 50pF.

The receiver offers true Fail-Safe operation, providing a guaranteed logic high on RO when the bus is open-circuit, short-circuit, or idle (terminated but not driven). The receiver’s worst case minimum input resistance is at least 70KΩ at 200oC.



  • Extended Temperature Ranges -55°C to +175°C (plastic packages) and -55°C to +200°C (Ceramic CERDIP-8 package)
  • Slew Rate Control and Pre-Emphasis for superior EMI
  • Extended Power Supply Operating Range (3.15V - 5.5V)
  • Extended Receiver Common-Mode Range
    • -12V to +15V Half-Duplex
    • +/-20V Full-Duplex
  • ESD Protection:
    • 16KV HBM (Bus Pins)
    • 8KV HBM (Logic Pins)
  • 20 Mbps Data Rate up to 50ft (CAT-5 UTP)
  • 12 Mbps Data Rate up to 1000ft (CAT-5 UTP)
  • Guaranteed Fail-Safe Receiver Operation
  • Current Limiting Protection
  • Industry Standard 75176 Pinout



  • Extended Temperature Range RS-485/422 Networks
  • Oil Exploration / Down-Hole Drilling
  • Process Control and Factory Automation
  • EMI Emission Sensitive Avionics
  • Industrial Field Bus Networks
  • Networks requiring extended common-mode range
  • Miniature Munitions Stores Interface (MMSI / EBR-1553)