FDC37N3869-MD

Controllers Overview

The SMSC FDC37N3869-MD is a 3.3V Super I/O Controller compliant with PC 99 standards, designed for portable motherboard applications. It integrates a licensed CMOS 765B floppy disk controller, two 16C550-compatible UARTs, and a multi-mode parallel port with ChiProtect circuitry. The device supports Infrared communications via IrDA v1.1 (4Mbps), HPSIR, and ASKIR protocols. Key electrical parameters include operation at 3.3V, a maximum clock frequency of 14.32 MHz, and an ISA bus interface. It features a 100-pin PQFP package with a 0.65mm pin pitch.

Controllers Feature Summary

• Integrates a licensed CMOS 765B floppy disk controller with 16-byte data FIFO and direct drive support.
• Includes two high-speed NS16C550 compatible UARTs with send/receive 16-byte FIFOs supporting up to 460k baud.
• Features an enhanced digital data separator and infrared communications controller supporting IrDA v1.1 and consumer IR.
• Provides a multi-mode parallel port with EPP/ECP support and ChiProtect circuitry.

Controllers Applications

• Portable computer motherboards
• Infrared communication interfaces
• Legacy peripheral integration in embedded systems

Controllers Procurement Notes

Verify the specific suffix 'MD' against official SMSC documentation to confirm package type and temperature range. Ensure compatibility with the target system's ISA bus signaling and 3.3V power supply requirements. Confirm that the software register set aligns with the proprietary 82077AA core compatibility intended by the design.

Controllers Selection Notes

Select this component when a PC 99-compliant Super I/O solution with integrated infrared support is required for 3.3V portable designs. It is suitable for systems needing legacy floppy, serial, and parallel port connectivity without external filter components. Consider the 100-pin PQFP package constraints during PCB layout planning.

Controllers Part Context

The FDC37N3869 belongs to SMSC's SuperCell technology family of Super I/O controllers. It is part of a broader series including variants like the FDC37N869, which supports both 5V and 3.3V operation. This specific model focuses on 3.3V optimization for portable applications while maintaining software compatibility with established floppy controller cores.

Controllers Replacement Considerations

The FDC37N869 is a related variant offering dual voltage support (5V and 3.3V). Verify if the system requires 5V tolerance or if the 3.3V-only specification of the FDC37N3869 is sufficient. Check for any differences in pinout or feature sets between these siblings before substitution.