FDC37669QFP

Application Specific Microcontrollers Overview

The SMSC FDC37669QFP is a Super I/O controller designed for PC-98/99 compliant systems. It integrates a floppy disk controller, two high-speed UARTs, and an infrared communications controller within a 100-pin PQFP package. The device operates on a single 5V supply and supports ISA bus compatibility with plug-and-play features. Key electrical specifications include an external data bus width of 8 bits, an address bus width of 11 bits, and a maximum functional clock frequency of 14.32 MHz. It functions within a commercial temperature range of 0°C to 70°C.

Application Specific Microcontrollers Feature Summary

• Integrated Floppy Disk Controller: Supports one floppy drive directly with DMA enable logic and configurable output drivers.
• Infrared Support: Includes an IrDA v1.1 (4Mbps) and HPSIR controller with two IR ports.
• Serial Ports: Features two NS16C550 compatible UARTs with 16-byte FIFOs supporting up to 460k baud.
• Power Management: Intelligent auto power management with shadowed write-only registers for ACPI compliance.

Application Specific Microcontrollers Applications

• PC-98 and PC-99 compliant desktop computer motherboards
• Legacy industrial control systems requiring Super I/O functionality
• Embedded systems needing integrated serial and infrared communication interfaces

Application Specific Microcontrollers Procurement Notes

Verify the specific suffix 'QFP' confirms the 100-pin Quad Flat Package variant. Confirm the manufacturer origin, as Microchip Technology acquired SMSC's peripheral business; ensure documentation aligns with the original SMSC or current Microchip revisions. Check for any specific ordering codes that may indicate tape-and-reel versus tray packaging if required by assembly processes.

Application Specific Microcontrollers Selection Notes

Select this component when designing for legacy PC-98/99 architectures requiring a single-chip solution for floppy, serial, and IR interfaces. Ensure the system design provides a stable 5V supply rail, as the device does not support 3.3V operation unlike the FDC37N series. Verify that the ISA bus interface timing requirements are met by the host system controller.

Application Specific Microcontrollers Part Context

This part belongs to the FDC37C6xx family of enhanced Super I/O controllers from SMSC. It is functionally similar to the FDC37C669 but packaged in QFP. Other family members include the FDC37C665 and FDC37M81, which offer variations in parallel port capabilities or wake-up features. The device serves as a bridge between legacy ISA peripherals and the main system bus.

Application Specific Microcontrollers Replacement Considerations

The FDC37C669 is a direct pin-compatible alternative. For 3.3V applications, the FDC37N769 or FDC37N869 may be considered, though voltage levels differ. Microchip Technology parts such as FDC37C669-MT are also available as equivalents from the acquiring company.