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UPD765AC Specifications

Detailed technical information and Application Scenarios

Product Details

PartNumberManufactorQuantityAvailability
UPD765ACNEC108Yes

UPD765AC** is a floppy disk controller (FDC) IC manufactured by **NEC**.

The UPD765AC is a floppy disk controller (FDC) IC manufactured by NEC. Below are its key specifications, descriptions, and features:

Manufacturer:

NEC (Nippon Electric Company)

Specifications:

  • Type: Floppy Disk Controller (FDC)
  • Compatibility: Supports IBM-compatible floppy disk drives (5.25" and 3.5")
  • Interface: Parallel (8-bit data bus)
  • Data Transfer Rate: Up to 1 Mbps (depending on mode)
  • Operating Voltage: +5V
  • Operating Temperature: 0°C to +70°C (commercial grade)
  • Package: 40-pin DIP (Dual In-line Package)

Description:

The UPD765AC is a second-generation floppy disk controller IC designed for IBM PC/AT and compatible systems. It provides full control over floppy disk operations, including read, write, format, and seek functions. It supports single- and double-density floppy disk formats and is widely used in retro computing and vintage PC hardware.

Key Features:

  • IBM 765-compatible architecture
  • Supports MFM (Modified Frequency Modulation) encoding
  • Programmable data rate (250/300/500/1000 kbps)
  • DMA (Direct Memory Access) support for efficient data transfer
  • Interrupt-driven operation
  • Automatic head load/unload control
  • Error detection and correction (CRC checking)
  • Supports up to four floppy drives (via external logic)

The UPD765AC was commonly used in PC/XT, PC/AT, and early x86 systems for floppy disk control. It was later succeeded by more advanced FDCs with enhanced features.

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