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UM8272A Floppy Disk Controller (FDC)
Description:
- This integrated circuit comprises the logic and control capabilities required for linking a processor with up to four floppy disk drives.
- It supports IBM-compatible formats in both single and double density recording, making it appropriate for a wide range of disk-based applications.
- Memory Storage: Supports both IBM 3740 single density and IBM System 34 double density formats, including double-sided recording.
- Data records can be 128, 256, 512, or 1024 bytes long.
- Multi-Sector and Multi-Track Transfers: Capable of efficiently transferring across sectors and tracks.
- DMA and Non-DMA Modes: Supports both Direct Memory Access (DMA) and Non-DMA activities.
- Control Signals: Provides control signals that aid in the construction of an external phase-locked loop and PR compensation circuitry.
- Clock Speed: Runs on a single-phase 8MHz clock.
- Power Supply: Only one +5V power supply is required.
- Available in common IC packages to provide interoperability with a variety of systems.
Specifications:
- Function: Floppy Disk Controller.
- Memory Size: 2048 bits (organized as 256 x 8).
- Operating Voltage: 5V.
- Clock Speed: 8 MHz.
- Package Type: 20-Pin DIP (Dual In-line Package).
Performance:
- Access Time: 60 ns.
- Data Retention: 10 years.
- Input Voltage Levels:
- VIL (max): 0.8V.
- VIH (min): 2V.
- Output Voltage Levels:
- VOL (max): 0.4V.
- VOH (min): 2.4V.
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