HI-32820 / HI-32820B

The HI-32820 is a silicon gate CMOS device for interfacing the ARINC 429 serial data bus to a 16-bit parallel data bus. It is a form-fit-function drop-in replacement for Holt’s well known HI-3282. Two receivers and an independent transmitter are provided. The receiver input circuitry and logic are designed to meet the ARINC 429 specifications for loading, level detection, timing, and protocol. The ARINC inputs of the HI-32820-10 configurations also have internal lightning protection to DO-160D, Level 3. The transmitter section provides the ARINC 429 communication protocol. An external ARINC 429 Line Driver such as the Holt HI-3182 or HI-8585 is required to translate the 5 volt logic outputs to ARINC 429 drive levels.

The 16-bit parallel data bus exchanges the 32-bit ARINC data word in two steps when either loading the transmitter or interrogating the receivers. The data bus interfaces with CMOS and TTL.

Timing of all the circuitry begins with the master clock input, CLK. For ARINC 429 applications, the master clock frequency is 1 MHz. 

Each independent receiver monitors the data stream with a sampling rate 10 times the data rate. The sampling rate is software selectable at either 1MHz or 125KHz. The results of a parity check are available as the 32nd ARINC bit. 

The transmitter has a First In, First Out (FIFO) memory to store 8 ARINC words for transmission. The data rate of the transmitter is software selectable by dividing the master clock, CLK, by either 10 or 80. The master clock is used to set the timing of the ARINC transmission within the required resolution.

The HI-32820BPJx product has a minimum low speed data rate of 6.5K BPS.

Features

• ARINC Specification 429 Compatible
• Compatible With Industry-Standard Alternate Parts
• Small Footprint 44 PQFP Package Option
• 16-Bit Parallel Data Bus
• Direct Receiver Interface to ARINC Bus
• Internal Lightning Protection of ARINC inputs in accordance with DO-160D, Level 3 (-10 options only)
• Timing Control 10 Times the Data Rate
• Selectable Data Clocks
• Automatic Transmitter Data Timing
• Self Test Mode
• Parity Functions
• Low Power, Single 5 Volt Supply
• Industrial & Extended Temperature Ranges Available

Applications

• Avionics data communication
• Serial to parallel conversion
• Parallel to serial conversion