HI-3220 / HI-3221 / HI-3222 / HI-3225 / HI-3226

The HI-3220 from Holt Integrated Circuits is a family of single chip CMOS high density application data management ICs capable of managing, storing and forwarding avionics data messages between sixteen ARINC 429 receive channels and eight ARINC 429 transmit channels, making these devices ideal for data concentrator applications. Options for eight receive and four transmit channels are also available in a compact, cost effective 7mm x 7mm QFN package footprint.


The ARINC 429 buses may operate independently - the IC can be programmed to automatically re-format, re-label, re-packetize and re-transmit data from ARINC 429 receive buses to ARINC 429 transmit buses. Alternatively, a host CPU can send and receive data on multiple buses. 32KB of on-board memory allows received data to be logically organized and automatically updated as new ARINC 429 labels are received via label mailboxes. A 64 message deep Receive FIFO is also available for each receive channel. Each transmitter has the option to independently enable a programmable scheduler on the ARINC 429 bus, or the host CPU may insert new labels for transmission at will, even when running under scheduler control.


An optional auto-initialization feature allows configuration information to be up-loaded from an external EEPROM on reset to facilitate rapid start-up or operation without a host CPU. This requires no software overhead or host initialization programming, simplifying DO-178 or DO-254 certification. 


The HI-3220, HI-3221 and HI-3222 have integrated ARINC 429 line receivers, capable of RTCA/DO-160 level 3 lightning compliance with external 40kΩ resistors. HI-3225 and HI-3226 use external line receivers and may be preferred when higher levels of lightning protection are demanded. The HI-3222 is an 8-channel receive, 4-channel transmit option available in a smaller 7mm x 7mm QFN package footprint. Transmit outputs interface directly to external HI-8592, HI-8596, or integrated lightning protected HI-8597 ARINC 429 line drivers. All parts use a 40 MHz 4-wire SPI (Serial Peripheral Interface) host connection.


HI-3220 and HI-3225 are available in an 80-pin PQFP package, whereas HI-3221 and HI-3226 are available in a 72-pin 10mm x 10mm QFN package. The HI-3222 (8-ch. Rx, 4-ch. Tx) is available in a very compact 48-pin 7mm x 7mm QFN. 




  • Sixteen ARINC 429 Receive channels with optional integrated line Receivers
  • Eight ARINC 429 Transmit channels
  • 8-channel Rx, 4-channel Tx version available in compact 48-pin 7mm x 7mm QFN
  • 32KB on-chip user-configurable data storage memory
  • Programmable received data filtering
  • Non-annunciated fault protection
  • Option for programmable transmission schedulers for periodic ARINC 429 broadcasting or CPU directed transmission
  • 40MHz SPI CPU Interface
  • Auto-initialization feature allows power-on configuration or independent operation without a CPU
  • Transmitter rate and tri-state control outputs
  • Supports 100kbs / 50kbs / 12.5kbs data rates
  • Industrial (-40°C to +85°C) and Extended (-55°C to +125°C) temperature ranges supported.  


  • Data concentrators 
  • Avionics data management, storage & forwarding
  • CMOS/TTL to ARINC Level Conversion
  • CMOS/TTL to RZ & NRZ Level Conversion



ADK-3220: HI-3220 Application Development Kit

ADK-3220: HI-3220 Application Development Kit

The Holt ADK-3220 evaluation board demonstrates the broad feature set of Holt’s ARINC 429 Data Management IC, HI-3220. This device includes sixteen ARINC 429 receivers and eight digital transmitters integrated into a single IC and is the successor to the HI-3200 and HI-3210; additional features include an expanded number of channels and new enhancements designed to increase host communication efficiency.
More Information