Located in Aliso Viejo, California, Holt Integrated Circuits is a major supplier of Integrated Circuits for the aerospace industry. For over twenty years, Holt has manufactured data bus and display drivers for both commercial and military users worldwide. From F-16 to A-350, you will find Holt ICs at the heart of Flight Control, Navigation, Engine Management, Communications, Safety equipment, and In-Flight Entertainment systems. Over 400 Avionics manufacturers rely on Holt’s proven track record of customer service, unsurpassed quality and cost-effectiveness, and technical excellence to keep their products at the leading edge. Holt’s range of ICs supporting the ARINC 429 standard is the widest in the industry, ranging from simple line receivers to full protocol solutions with integrated RAM. The latest line of ARINC 429 products are fully functional terminal ICs designed to operate from a single 3.3V supply, resulting in a significant reduction in system complexity and board space. Holt MIL-STD-1553 solutions are the smallest and most cost effective, providing the entire MIL-STD-1553 interface on a single chip. The flagship ICs are widely accepted as the easiest to use in the industry, providing dedicated host interfaces, on-chip RAM, BC/MT/RT and transceiver functions in one small footprint package. Other products include high voltage LCD display drivers and ARINC 825 (CAN) data bus products. Holt has the distinction of being the first company in the world to integrate a CAN controller and transceiver on the same IC in a single, compact plastic package. All of Holt’s Commercial-Off-The-Shelf (COTS) products are DO-254 certifiable, further emphasizing its commitment to aerospace customers. In addition, Holt offers product compliant to the European Union "RoHS Directive 002/95/EC" and is AS9100D:2016 and ISO 9001:2015 registered. Select products are also available to DSCC SMD specifications. Customer service, dependability and an uncompromising commitment to quality are the guiding principles of how we do business. In avionics, there can be no second best.

At Holt, the customer determines the quality of our products and services. Customer satisfaction is our most important quality measurement. We build quality into each step of the process, from the initial review of our customers’ requirements to the ESD protected shipping containers used for product delivery. All employees are committed to providing the highest possible quality integrated circuits that meet or exceed our customers’ requirements and expectations. Our commitment to quality is attested to by our AS9100D:2016 and ISO 9001:2015 registration. The Quality department is responsible for reviewing all purchase orders, customer specifications, drawings and other customer documents in order to assure compliance with all specified requirements. Detailed production travelers reflecting these requirements are generated, reviewed and approved prior to manufacture. A final review of each purchase order is performed prior to each product shipment.

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. All parts use a 40 MHz 4-wire SPI (Serial Peripheral Interface) host connection. 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, HI-3222 and HI-3223 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 and HI-3223 are 8-channel receive, 4-channel transmit options available in smaller package footprints, with HI-3223 having the same slope control feature as HI-3220. Transmit outputs interface directly to external HI-8592, HI-8596, or integrated lightning protected HI-8597 ARINC 429 line drivers. 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.

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