The HI-3717 from Holt Integrated Circuits is a CMOS device designed for interfacing an ARINC 717 compatible bus to a Serial Peripheral Interface (SPI) enabled micro-controller. The part includes selectable Harvard Bi-Phase (HBP) and Bi-Polar Return-to-Zero (BPRZ) channels with encoders/decoders and dedicated line drivers and line receivers for direct connection to the ARINC 717 bus. The part operates from a single +3.3V supply using only four external capacitors. Each transmit and receive channel has a 32-word by 12-bit FIFO for data buffering. The HI-3717 is available in very small 44-pin 7mm x 7mm Chip-scale (QFN) and 44-pin Quad Flat Pack (PQFP) plastic packages.



  • Compliant with ARINC 717 and ARINC 573 standards
  • Operates from a single +3.3V supply with on-chip converters to provide proper voltages for both Harvard Bi-Phase (HPB) and Bi-Polar Return-to-Zero (BPRZ)outputs
  • One selectable receive channel as HBP or BPRZ with integrated analog line receiver
  • Both HBP and BPRZ transmitters have integrated line drivers as well as digital outputs
  • 32-word by 12-bit FIFOs for both the receive and the transmit channel
  • Programmable slew rates on transmit channels: 1.5µs, 7.5µs or 10µs
  • Digital transmitter outputs available for use with external line drivers
  • Programmable bit rates: 384, 768, 1536, 3072, 6144, 12288, 24576, 49152 and 98304 bits/sec (32, 64, 128, 256, 512, 1024, 2048, 4096 and 8192 words/sec)
  • Enhanced Sync detection allows multiple false sync marks in user data while still synchronizing within 8 seconds
  • Fast SPI transmitter write and receiver read modes
  • Match pin flags when preprogrammed word count / subframe is received
  • Frame / subframe word count indicator
  • Industrial and Extended temperature ranges
  • Burn-in available



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