QD8279

Specialized Overview

The QD8279 is a programmable keyboard/display interface controller manufactured by Rochester Electronics, LLC. It serves as a hardware-independent solution for managing keyboard scanning and LED display driving within embedded systems. The device supports an 8x8 matrix keyboard configuration with FIFO buffering and noise cancellation. For display output, it features a 16-byte internal memory capable of driving up to sixteen seven-segment digits via dynamic scanning. The component utilizes a standard parallel interface for CPU communication and operates on a 5V supply voltage.

Specialized Feature Summary

• Hardware-based execution of keyboard scanning and display multiplexing tasks
• Integrated FIFO queue for buffered keyboard data entry
• Configurable operating modes including sensor and strobe input options

Specialized Applications

• Industrial control panels requiring dedicated input/output handling
• Embedded instrumentation with numeric display interfaces
• Legacy system peripheral replacement in manufacturing equipment

Specialized Procurement Notes

Verify the manufacturer marking against the specified part number to ensure authenticity. Confirm that the package type matches the required footprint for your design. Check for any specific suffix variations that may indicate temperature range or packaging differences. Ensure compatibility with existing system voltage levels before integration.

Specialized Selection Notes

Select this component when a dedicated hardware interface for keyboard and display management is required to reduce CPU load. It is suitable for designs needing simultaneous input processing and multi-digit LED driving without complex software overhead. Consider pinout compatibility if replacing older Intel versions in existing layouts.

Specialized Part Context

This part belongs to the 8279 series of programmable keyboard/display controllers originally developed by Intel. Rochester Electronics produces these components as long-life replacements for legacy systems. The QD8279 variant maintains functional equivalence with earlier iterations while adhering to modern manufacturing standards for reliability and availability in industrial applications.

Specialized Replacement Considerations

Direct substitutes include the Intel 8279 and HD7279A. Verify pin compatibility and electrical specifications before swapping. Ensure that any alternative component supports the same 8x8 matrix and 16-digit display capabilities.