The uPD8284A is a clock generator and ready interface device manufactured by NEC. It's designed for use with the Intel 8086/8088 microprocessor family and provides the necessary clock signals and ready synchronization for these processors to interface with various memory and peripheral devices.

Applications:

• IBM PC and PC-compatible systems: Used as a clock generator and ready interface in early PC designs.
• Industrial control systems: Provides clock signals and synchronization for microprocessor-based control systems.
• Embedded systems: Used in various embedded applications requiring an 8086/8088 processor.
• Legacy computer systems: Employed in older computer systems for clock generation and ready signal management.

Features:

• Clock Generation: Provides the necessary clock signals for the 8086/8088 processor.
• Ready Synchronization: Synchronizes the processor with slower memory and peripheral devices.
• Crystal Oscillator: Contains an on-chip crystal oscillator for generating the clock signal.
• Reset Circuitry: Includes reset circuitry to initialize the processor.
• TTL Compatible: Compatible with standard TTL logic levels.
• DIP Package: Typically available in a Dual In-line Package (DIP).

Benefits:

• Simplified System Design: Integrates clock generation and ready synchronization into a single chip, simplifying system design.
• Improved System Reliability: Provides stable and reliable clock signals for the processor.
• Reduced Component Count: Reduces the number of discrete components required for clock generation and ready interface.
• Compatibility: Designed for use with the Intel 8086/8088 processor family.

Additional Details:

The uPD8284A operates from a single +5V power supply. The clock frequency is determined by an external crystal. The READY input is used to synchronize the processor with slower memory and peripheral devices. When the READY input is low, the processor will enter a wait state until the READY input is high. The RESET input is used to reset the processor. Consult the NEC datasheet for detailed specifications and application information. This part is a legacy component and may be difficult to source. The 'D' suffix likely refers to the package type.