N82077AA

Controllers Overview

The Intel N82077AA is a floppy disk controller integrated circuit designed for PC-AT and PS/2 systems. It supports data transfer rates up to 0.125 MBps with an 8-bit external data bus width. The device operates on a 5 V power supply, with a maximum rating of 5.5 V. It is housed in a 68-pin Plastic Quad Flat Pack (PQCC) or LCC package. The component features integrated tape drive support and power management capabilities, operating within a temperature range of -40 °C to 70 °C.

Controllers Feature Summary

• Supports IBM PC, AT, and PS/2 floppy disk standards including high-density formats
• Integrates power management features for system efficiency
• Provides dedicated support for integrated tape drive operations

Controllers Applications

• PC-AT compatible motherboard designs
• PS/2 system architecture implementations
• Legacy industrial control systems requiring floppy storage interfaces

Controllers Procurement Notes

Verify the specific manufacturer source, as the part number is historically associated with Intel but may be distributed by other semiconductor vendors. Confirm the package type matches the required PCB footprint, typically LCC-68 or PQCC-68. Ensure compliance with current environmental regulations, noting that original versions were not RoHS compliant. Validate pin compatibility with existing ISA bus controllers if used in retro-computing projects.

Controllers Selection Notes

Select this component when designing systems requiring native support for legacy floppy disk drives without additional logic gates. It serves as a direct replacement for older FDC chips in maintenance scenarios. Consider the 68-pin package constraints during PCB layout. Verify voltage levels match the target system's 5V logic requirements. This controller is suitable for applications needing reliable serial data processing for magnetic media.

Controllers Part Context

The N82077AA belongs to the family of floppy disk controllers used in personal computers from the late 1980s through the 1990s. It was commonly utilized in motherboards and expansion cards to manage data flow between the CPU and floppy drives. The device simplifies design by integrating necessary timing and control signals directly onto the chip, reducing board complexity compared to discrete solutions.

Controllers Replacement Considerations

The Intel 82072A is a common predecessor often replaced by this model. Some designs may use the National Semiconductor PC8477 as a functional equivalent. Verify pin-to-pin compatibility before substitution. Check if the replacement supports the same high-density disk formats required by the application.