LPC47S422-MS

Specialized Overview

The LPC47S422-MS is a Super I/O controller designed for server applications, operating at 3.3V with 5V tolerance. It features an LPC interface and integrates two FDCs, a multi-mode parallel port with ChiProtect, two UARTs, an 8042 keyboard controller, and an SMBus controller. The device includes 39 GPIOs, fan speed control, and programmable wakeup events. It supports PC99 and ACPI 1.0 standards with intelligent auto power management. The component is housed in a 100-pin QFP lead-free RoHS compliant package.

Specialized Feature Summary

• Integrated CMOS 765B floppy disk controller with advanced digital data separator
• Multi-mode parallel port supporting EPP and ECP with ChiProtect circuitry
• Two high-speed NS16C550 compatible UARTs with IrDA support
• ISA Plug-and-Play compatibility with reprogrammable I/O addresses and IRQs

Specialized Applications

• Server motherboard system controllers
• Industrial PC embedded systems
• Legacy peripheral interfacing in modern hardware designs

Specialized Procurement Notes

Verify the manufacturer origin as SMSC or its subsidiaries, noting that Microchip Technology acquired SMSC assets. Confirm the specific ordering suffix MS corresponds to the 100-pin QFP lead-free RoHS compliant package. Ensure the revision matches the product preview documentation Rev. 05-07-07 for accurate feature alignment.

Specialized Selection Notes

Select this component when LPC interface pin reduction is required alongside legacy ISA functionality. It is suitable for designs needing integrated floppy, parallel, and serial ports without external controllers. Verify voltage requirements align with the 3.3V operation and 5V tolerant inputs before integration into the target system architecture.

Specialized Part Context

This part belongs to the LPC47S series of enhanced Super I/O controllers. It replaces older ISA-based solutions by utilizing the Low Pin Count (LPC) interface while maintaining full software and register compatibility with standard PC99 architectures. It serves as a central hub for legacy I/O functions in server-grade platforms.

Specialized Replacement Considerations

Check for updated revisions from the current manufacturer holding SMSC rights. Verify pin-to-pin compatibility if substituting within the LPC47S family. Ensure firmware drivers support the specific logical device configuration options available in this model.