LPC47M182-NW

Specialized Overview

The LPC47M182-NW is a 3.3V (5V tolerant) Advanced I/O Controller designed for Desktop PCs, implementing the Low Pin Count (LPC) interface. It integrates legacy I/O functions and Motherboard GLUE logic into a single 128-pin QFP package. The device supports ACPI 1.0b/2.0 standards and PC99a/PC2001 compliance. Key features include a CMOS 765B floppy disk controller, two 16C550A compatible UARTs, a multi-mode parallel port with ChiProtect, and an infrared port. It provides 13 general-purpose I/O pins, two fan tachometer inputs, and sophisticated power control circuitry.

Specialized Feature Summary

• Integrates complete legacy I/O functionality including keyboard/mouse controller, floppy disk controller, dual serial ports, and parallel port within a single chip.
• Includes Motherboard GLUE logic for power management, reference generation, reset signaling, and voltage translation to reduce motherboard component count.
• Supports ISA Plug-and-Play standard register set with reprogrammable I/O addresses, DMA channels, and hardware IRQ options.
• Features sophisticated power control circuitry supporting multiple low power-down modes and wake-up events compliant with ACPI standards.

Specialized Applications

• Desktop Personal Computer motherboards
• System designs requiring consolidated legacy I/O and glue logic
• ACPI compliant power management implementations

Specialized Procurement Notes

Verify the specific ordering suffix against current Microchip documentation to confirm packaging type, as the -NW suffix denotes the 128-pin QFP package. Confirm RoHS compliance status directly with the manufacturer or authorized distributors, as environmental declarations may be updated. Ensure the source document matches the latest revision number DS00001809A to avoid discrepancies in pinout or electrical specifications.

Specialized Selection Notes

Select this component when designing desktop PC architectures that require integration of legacy interfaces alongside modern LPC bus connectivity. It is suitable for applications needing reduced board space by consolidating glue logic and I/O controllers. Verify that the system design accommodates the 128-pin QFP footprint and operates within the specified 3.3V supply voltage range while maintaining 5V tolerance on input/output pins.

Specialized Part Context

The LPC47M182 belongs to Microchip's family of Advanced I/O Controllers designed for PC platforms. It replaces discrete components typically used for legacy I/O and motherboard control logic. The device simplifies motherboard design by integrating these functions, thereby lowering cost and assembly complexity compared to solutions using multiple separate chips.

Specialized Replacement Considerations

Consult Microchip official documentation for direct cross-reference part numbers. Verify pin-to-pin compatibility and register-level equivalence if substituting with other LPC-based I/O controllers from the same manufacturer or competitors.