The HI-8475 / HI-8476 are ARINC 429 Receivers designed specifically for use without a microprocessor. All configuration and control is programmed via logic level input pins, eliminating the need for a microprocessor or software interface and greatly reducing or eliminating the cost associated with software certification.
The 64-pin HI-8475 receives ARINC 429 data directly from the bus and makes the data available at 32 digital output pins. ARINC 429 label filtering is defined by 16 digital input pins, defining a maskable label match to enable reception of a single label or group of labels.
The 128-pin HI-8476 option increases the label match capability by two maskable labels, and provides both true and complementary digital outputs to simplify external logic. In addition, a default post-reset condition on the outputs is programmable before the first ARINC 429 word is received.
A dedicated PARITY pin enables parity checking of incoming ARINC 429 words. If PARITY is set high, the receiver logic checks for odd parity. ARINC bit 32 is overwritten by the HI-8475/76 to a zero if odd parity was received, or to a one if even parity (error condition) was received. Regardless of parity error, the word is stored in the input shift register. If it is undesirable in the application to store the word with parity error, the user should select the HI-8477 / HI-8478, which disgards words with parity error when parity checking is enabled. If parity checking is disabled (PARITY pin = logic "0"), all 32 bits of the ARINC word are stored without parity check.
The receiver inputs are lightning protected to RTCA/DO-160G, Section 22 Level 3 Pin Injection Test Waveform Set A (3 & 4), Set B (3 & 5A) and Set Z (3 & 5B) with the use of only two external resistors. The devices support both high-speed and low-speed ARINC 429 data rates, operating from a 1MHz clock source and a single 3.3V or 5.0V power supply.
All devices are available in industrial −40oC to +85oC and extended −55oC to +125oC temperature ranges.
Features
- Pin programmable - requires no MCU or software control
- No need for certification to RTCA DO-178B, “Software Considerations in Airborne Systems and Equipment”
- Robust CMOS Silicon-on-Insulator (SOI) technology
- On-chip ARINC 429 Line Receiver
- 3.3 V or 5.0V single supply operation
- Maskable Label Filtering for single label or groups of labels
- Internal lightning protection circuitry for receiver inputs allows compliance with RTCA/DO-160G, Section 22 Level 3 Pin Injection Tests
- 128-pin HI-8476 option provides enhanced label filtering and output flexibility
- Certifiable to RTCA DO-254, “Design Assurance for Airborne Electronic Hardware”
Applications
- ARINC 429 data reception
- ARINC 429 applications requiring no MCU or software
