LPC47S422QFP

Specialized Overview

The LPC47S422 is a Super I/O controller designed for notebook and desktop computer systems. It integrates multiple peripheral interfaces including two full-function serial ports, a floppy disk controller, and a keyboard/mouse controller. The device supports X-Bus interface for external component expansion and includes programmable wakeup events via the IO_PME# pin. It operates at 3.3V with 5V tolerant inputs and features SMI support through the IO_SMI# pin. The package type is QFP, providing a compact solution for system management and I/O control tasks in legacy computing architectures.

Specialized Feature Summary

• Integrates dual high-speed UARTs compatible with NS16C550 standards
• Includes dedicated floppy disk controller and keyboard/mouse interface
• Supports X-Bus interface for up to four external components
• Features programmable wakeup event interface and SMI support

Specialized Applications

• Notebook computer system management
• Desktop PC motherboard I/O control
• Legacy peripheral interface integration

Specialized Procurement Notes

Verify the manufacturer designation carefully as SMSC was acquired by National Semiconductor, which was subsequently acquired by Texas Instruments. Ensure the part number matches the specific QFP package variant. Request original datasheets from authorized distributors or TI to confirm authenticity and revision level before procurement.

Specialized Selection Notes

Select this component when a single-chip solution for legacy I/O functions is required in space-constrained designs. It consolidates serial, parallel, keyboard, mouse, and floppy controllers. Verify voltage compatibility with the system's 3.3V logic levels and ensure the QFP package fits the PCB footprint constraints.

Specialized Part Context

This component belongs to the National Semiconductor (formerly SMSC) LPC47 series of Super I/O controllers. These devices were widely used in PC motherboards to manage low-speed peripherals. The LPC47S422 specifically targets notebook applications with its integrated power management features and compact packaging options.

Specialized Replacement Considerations

Check for direct replacements within the Texas Instruments LPC47Nxxx series or LPC47Bxxx series. Verify pin-to-pin compatibility and register-level functionality if substituting with other Super I/O controllers from different manufacturers.