HI-87830 / HI-87840 / HI-87850

The HI-87830, HI-87840, and HI-87850 are system components for interfacing 8 bit parallel data to an ARINC 429 bus. The HI-87830 is a logic device only and requires a separate line driver circuit, such as the Holt’s HI-8500. The HI-87840 and HI-87850 combine logic and line driver on one chip. The HI-87840 has an output resistance of 37.5 ohms, and the HI-87850 has an output resistance of 10 ohms to facilitate external lightning protection circuitry. The technology is analog/digital CMOS.

The products offer high speed data bus data transactions to a buffer register. After loading 4 bytes, data is automatically transferred and transmitted. The data rate is equal to the clock rate. Parity can be enabled in the 32nd bit. Reset is used to initialize the logic upon startup. Word gaps are transmitted automatically.

The HI-87840 and HI-87850 require +/- 10 volt supplies in addition to the 5 volt supply.

The HI-87830, HI-87840 and HI-87850 are form, fit, function drop-in replacements for Holt’s equivalent HI-8783, HI-8784 and HI-8785 family of devices respectively. 

Features

• Automatic Conversion of 8-Bit Parallel Data to ARINC 429, 575 and 561 Data
• High Speed Parallel 8-Bit Data Bus
• Direct Analog Interface to the ARINC Bus (HI-8784, HI-8785)
• Digital Output Slope Control (HI-8784, HI-8785)
• Reset Input for Power-On Initialization
• 32nd Transmitted ARINC Bit Selectable as Either Parity or Data
• Simplified Lightning Protection With the Ability to Add 27.5 Ohm External Series Resistors to Each ARINC Output (HI-8785)
• Small Plastic SOIC and DIP Packages
• Low Power CMOS
• Industrial & Extended Temperature Ranges Available

Applications

• Avionics Data Communication
• Parall el to Serial Conversion