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Description
The uPD74HC138C is an electronic component model that falls under the product category of IC chips. It is an LSI floppy disk controller (FDC) chip designed to simplify the interfacing of a processor with up to 4 floppy disk drives. The uPD74HC138C supports both the IBM 3740 single density format (FM) and the IBM System 34 double density format (MFM), including double-sided recording. It provides control signals that simplify the design of external phase-locked loop and write precompensation circuitry, making it easier to implement a floppy disk interface.
Specifications and Features
- Address mark detection circuitry simplifies the phase-locked loop and read electronics
- User-programmable track stepping rate, head load time, and head unload time
- Supports multi-track and multi-side read and write commands
- Supports both single and double density
- Allows variable recording length of 128, 256, or 8192 bytes per sector
- Compatible with FM and MFM control
- Capable of handling up to 4 floppy or micro floppy disk drives
- Data scan capability for comparing byte-for-byte host memory and disk data
- Supports data transfers in DMA or non-DMA mode
- Parallel seek operations on up to four drives
- Compatible with uPD8080/85, uPD8086/88, V-series, and uPD780 microprocessors
- Operates on a single-phase clock with a maximum frequency of 8 MHz
- Requires a power supply of 3 +5V only
Application Scenarios
The uPD74HC138C is commonly used in electronic devices that require floppy disk interfaces. It is suitable for applications such as computers, industrial equipment, and embedded systems where floppy disk storage is needed. The chip's compatibility with various microprocessors makes it versatile for different system architectures.
Comparison
The uPD74HC138C offers several advantages in terms of its features and specifications. It simplifies floppy disk interface implementation by providing control signals for phase-locked loop and write precompensation circuitry. It supports both single and double density formats, multi-track and multi-side read and write commands, and variable recording length. The chip is also capable of data transfers in DMA or non-DMA mode and parallel seek operations on multiple drives. Additionally, it is compatible with various microprocessors, allowing for flexible integration into different systems. However, it is important to note that the uPD74HC138C is limited to a single-phase clock with a maximum frequency of 8 MHz and requires a power supply of 3 +5V only. -
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Datasheet
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- Datasheet: Download UPD74HC138C
- Chipdatas Part: CD94-UPD74HC138C
- Warehouse: China, Hong Kong
- Dispatch: Within 24 hours
- Free Shipping: Yes
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- Last Updated: 2024/06/03 10:50 +0800
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