LPC47N227TQFP

Specialized Overview

The LPC47N227 is a Super I/O controller designed for notebook and desktop systems, manufactured by SMSC. It operates at 3.3V with 5V tolerant inputs and features an X-Bus interface supporting up to four external components. The device includes two full-function serial ports compatible with NS16C550 UARTs, 29 general-purpose I/O pins, and four IRQ input pins. It supports programmable wakeup events via the IO_PME# pin and System Management Interrupts via the IO_SMI# pin. The component is housed in a 100-pin STQFP package and functions as a floppy disc controller and I/O interface.

Specialized Feature Summary

• Integrates an X-Bus interface for connecting multiple external peripherals with write protection capabilities.
• Provides two high-speed serial ports based on NS16C550 compatible UART architecture.
• Supports system management features including SMI and programmable wakeup event interfaces.

Specialized Applications

• Notebook computer I/O control
• Desktop motherboard peripheral integration
• Floppy disk drive control

Specialized Procurement Notes

Verify the manufacturer designation carefully, as historical records may list All Sensors or other entities due to corporate acquisitions. Confirm the specific suffix indicates the STQFP package variant. Ensure compatibility with legacy X-Bus protocols if integrating into existing designs. Request official datasheets to validate electrical characteristics against current supply sources.

Specialized Selection Notes

Select this component when a dedicated Super I/O solution with X-Bus expansion is required for legacy systems. It is suitable for designs needing integrated serial communication and floppy control without external controllers. Consider the 100-pin footprint constraints during PCB layout. Verify voltage tolerance requirements match the 3.3V core with 5V I/O specifications.

Specialized Part Context

This part belongs to the LPC47N series of Super I/O controllers from SMSC (now part of Microchip Technology). These devices were widely used in late 1990s and early 2000s PC architectures to consolidate standard I/O functions. The N227 variant specifically targets notebook applications requiring low power consumption and compact integration.

Specialized Replacement Considerations

Direct replacements are limited due to the proprietary X-Bus interface. Check for LPC47N2xx series variants with identical pinouts. Legacy equivalents from National Semiconductor or Winbond may require significant schematic modifications. Verify software driver availability for any substitute components.