FDC37C669-MS

Specialized Overview

The FDC37C669-MS is a PC 98/99 compliant Super I/O controller manufactured by Microchip Technology, housed in a 100-pin QFP lead-free RoHS compliant package. It integrates a licensed CMOS 765B floppy disk controller supporting two drives and vertical recording formats with a 16-byte data FIFO. The device includes two NS16C550 compatible UARTs with 16-byte send/receive FIFOs, a multi-mode parallel port featuring ChiProtect circuitry for EPP/ECP support, and an optional IDE interface. Operating on 5V power, it supports intelligent auto power management with multiple low-power down modes.

Specialized Feature Summary

• Integrates a true CMOS 765B floppy disk controller core ensuring 100% IBM PC/XT and PC/AT compatibility with overflow and underflow protection.
• Features a multi-mode parallel port equipped with ChiProtect circuitry to prevent damage from printer power-on events while supporting EPP and ECP standards.
• Includes two high-speed serial ports (UARTs) compatible with NS16C550, supporting infrared interfaces including IrDA, HPSIR, and ASKIR formats.
• Incorporates sophisticated power control circuitry (PCC) enabling intelligent auto power management and multiple low-power down modes.

Specialized Applications

• Motherboard applications requiring PC 95/98/99 compliance
• Systems utilizing legacy floppy disk drives with vertical recording support
• Industrial or embedded controllers needing integrated serial and parallel communication ports

Specialized Procurement Notes

Verify the specific ordering suffix matches the required package type. The -MS suffix denotes a 100-pin QFP package that is lead-free and RoHS compliant. Confirm that the design requires the QFP form factor rather than the TQFP variant. Ensure the system voltage aligns with the specified 5V operation requirements before procurement.

Specialized Selection Notes

Select this component when a single-chip solution is needed for ISA host interface peripherals including floppy, serial, and parallel ports. It is suitable for designs requiring software configurable logic (SCL) to adjust base I/O addresses and interrupt requests. Consider the optional IDE interface availability if hard drive connectivity is required within the same Super I/O block.

Specialized Part Context

This part belongs to the FDC37C669 family of Super I/O controllers originally developed by SMSC Corporation and later acquired by Microchip Technology. The family provides comprehensive input/output control for legacy PC architectures. The FDC37C669 specifically targets motherboard implementations requiring integrated floppy disk control alongside standard serial and parallel interfaces.

Specialized Replacement Considerations

The FDC37C669QFP serves as the standard non-RoHS QFP alternative. For TQFP package requirements, consider the FDC37C669TQFP or its lead-free variant FDC37C669-MT. Verify pinout compatibility and register software compatibility when substituting between these package variants.