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.
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