HD4-6409/883

Encoders, Decoders, Converters Overview

The HD4-6409/883 is a Manchester Encoder-Decoder (MED) manufactured by Harris Corporation, designed for high-speed serial data communication applications. The device operates in two distinct modes: converter mode and repeater mode. In converter mode, it translates Nonreturn-to-Zero (NRZ) code into Manchester code and vice versa, eliminating DC components and providing clock recovery. In repeater mode, it accepts Manchester code input and reconstructs the signal using a recovered clock to minimize noise effects. The component features an on-chip oscillator and a digital phase lock loop, supporting data rates up to one megabit per second with a typical power consumption of 50mW at +5V.

Encoders, Decoders, Converters Feature Summary

• Supports independent Manchester encoder and decoder operation in both converter and repeater modes
• Integrates a digital phase lock loop for clock recovery and low bit error rate performance
• Features an on-chip oscillator and static design for low operating power consumption
• Provides high noise immunity and eliminates DC components inherent in NRZ codes

Encoders, Decoders, Converters Applications

• Serial data communication links requiring Manchester coding
• Magnetic tape recording systems
• Fiber optic communication interfaces
• Protocol controller interfacing where data accuracy is critical

Encoders, Decoders, Converters Procurement Notes

Verify that the specific part number includes the /883 suffix to ensure compliance with MIL-STD-883 standards. Confirm the qualification level matches Class Q requirements for harsh environment applications. Check manufacturing origin and date code to ensure authenticity, as this is a legacy military-grade component. Ensure proper handling procedures are followed due to the ceramic or LCC packaging types typically associated with this specification.

Encoders, Decoders, Converters Selection Notes

Select this component when a dedicated Manchester encoding solution is required for serial data transmission. It is suitable for designs needing integrated clock recovery without external PLL circuits. Consider the package options, such as the 20-lead dual-in-line or 20-pad LCC, based on board space and mounting constraints. Verify that the 1MHz maximum data rate meets system speed requirements before finalizing the selection.

Encoders, Decoders, Converters Part Context

This component belongs to the family of high-reliability data communications ICs processed in accordance with MIL-STD-883. It is designed for defense and aerospace applications where radiation hardness and reliability are paramount. The device serves as a bridge between standard NRZ logic and Manchester-coded transmission lines, ensuring signal integrity in noisy environments.

Encoders, Decoders, Converters Replacement Considerations

Direct replacements must also be MIL-STD-883 qualified Manchester Encoder-Decoders. Verify pin compatibility for the 20-lead DIP or LCC packages. Ensure substitute parts support the same 1MHz data rate and 5V supply voltage. Cross-reference with other Harris or Raytheon MED devices if available.