The HI-3718 is a low-power CMOS transceiver designed to meet the requirements of the ARINC 717 and ARINC 429 specifications. The device acts as an interface between ARINC 717 or ARINC 429 digital protocols and the Harvard Bi-Phase (HBP) and/or Bi-Polar Return-to-Zero (BPRZ) encoded physical layers.

The part includes a Harvard Bi-Phase (HBP) or Bi-Polar Return-to-Zero (BPRZ) line receiver which produces correct HBP or BPRZ digital signals for input to a decoder. The device also has HBP and BPRZ line drivers capable of accepting HBP and BPRZ encoded digital signals.
The device operates from a single +3.3V supply using only four external capacitors, making it the ideal interface device between an FPGA and ARINC 717 physical layer.

The HI-3718 is available in very small 32-pin 7mm x 7mm chip-scale (QFN) and 32-pin Quad Flat Pack (PQFP) plastic packages.



  • Compliant with ARINC 717 and ARINC 573 standards
  • BPRZ line driver and line receiver are ARINC 429 compliant
  • Operates from a single +3.3V supply with on-chip DC/DC converter
  • Independent Harvard Bi-Phase and Bipolar Return-to-Zero line drivers with digital slew rate control: set rise/fall times to 1.5μs, 3.75μs, 7.5μs or 10μs
  • Line drivers have independent tri-state control
  • HBP and BPRZ line receivers have common inputs
  • DC/DC converter may be disabled if external V+ and V- supplies are desired
  • “-40” inputs allow for DO-160G level 3 lightning protection using only two external resistors
  • Industrial and Extended temperature ranges



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