The HI-3717A 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-3717A is available in very small 44-pin 7mm x 7mm Chip-scale (QFN) and 44-pin Quad Flat Pack (PQFP) plastic packages.

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, 3.75µs 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