GENERAL DESCRIPTION
   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 a selectable Harvard Bi-Phase (HBP) or Bi-Polar Return-to-Zero (BPRZ) receive channel and transmit channels with HBP and BPRZ encoders and line drivers. The receive channel has integrated analog line receivers and the transmit channels have integrated line drivers for the corresponding encoding method (HBP and BPRZ). 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.

FEATURES
• 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

APPLICATIONS
• Digital Flight Data Acquisition Units (DFDAU)
• Digital Flight Data Recorders (DFDR)
• Quick Access Recorders (cassette type)
• Expandable Flight Data Acquisition and Recording
   Systems