The UPD7220D-2 is a Graphics Display Controller (GDC) manufactured by NEC. This chip is designed to handle the generation and control of video signals for display devices. It was commonly used in older computer systems and graphics terminals to manage the display of text and graphics.

Applications

• Graphics terminals
• Early personal computers
• Industrial display systems
• CAD/CAM workstations
• Instrumentation and measurement equipment with graphical displays

Features

• Generates video signals for CRT displays
• Supports various display resolutions and color depths
• Provides memory addressing for video RAM (VRAM)
• Includes drawing primitives for lines, rectangles, and circles
• Supports text mode and graphics mode operation
• Offers programmable timing parameters for display customization
• Can handle multiple display pages for animation and buffering

Benefits

• Enables the display of graphics and text on CRT monitors
• Provides a dedicated hardware solution for graphics processing
• Reduces CPU load by offloading display tasks
• Offers flexibility in configuring display parameters
• Supports a variety of display resolutions and color depths
• Facilitates the creation of graphical user interfaces

The UPD7220D-2 typically operates with a 5V power supply. It requires external video RAM (VRAM) to store the display data. A crystal oscillator is needed to generate the clock signal for the GDC. It outputs analog video signals that are compatible with CRT monitors. Detailed specifications, pin configurations, and timing diagrams are available in the datasheet. The '-2' suffix indicates a specific revision or variant of the UPD7220D.