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Microchip Technology LPC47N237-MT
- Part No.:
- LPC47N237-MT
- Manufacturer:
- Microchip Technology
- Category:
- Specialized
- Package:
- 100-LQFP
- Datasheet:
-
LPC47N237-MT.pdf
- Description:
- IC INTERFACE SPECIALIZED 100TQFP
- Quantity:
- Payment:
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Product details
Overview
LPC47N237-MT from Microchip Technology is a 3.3 V (5 V tolerant), PC99a/PC2001- and ACPI 1.0b/2.0-compliant docking I/O controller in a 100-pin TQFP RoHS package. It integrates an LPC interface, SMBus-hosted 32-bit GPIO block powered by VTR, a 16C550A-compatible UART with 16-byte FIFOs, and a multi-mode IEEE 1284 parallel port with ChiProtect™-designed for port replicators and docking stations.
For engineers reviewing the LPC47N237-MT datasheet, LPC47N237-MT pinout, LPC47N237-MT application, or LPC47N237-MT equivalent, key selection criteria include LPC bus compatibility, SMBus-driven standby-power GPIO control, serial IRQ support, nIO_PME signaling, and reprogrammable I/O address/DMA/IRQ resources across logical devices.
Technical Context
The LPC47N237-MT implements a legacy I/O hub architecture centered on the Low Pin Count (LPC) bus, supporting multiplexed command/address/data cycles and PCI-compatible serial IRQ. Its power management circuitry enables multiple low-power-down modes and supports PME assertion via the nIO_PME pin.
It hosts two independent I/O subsystems: a full-function UART with programmable baud rates up to 460 kbps and ring-indicator wakeup, and a tri-mode parallel port (Standard, EPP 1.7/1.9, ECP) with 480 I/O address options, three DMA channels, and hardware ChiProtect™ for surge immunity. All logical device resources-including I/O addresses, IRQs, and DMA-are configurable via internal registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.3 V nominal, 5 V tolerant I/O - enables direct interfacing with legacy 5 V peripherals without level shifters. |
| LPC Interface | Supports LPC I/O and DMA cycles with serial IRQ and nIO_PME - provides native integration into Intel chipset-based motherboards and docking systems. |
| UART | 16C550A-compatible with 16-byte TX/RX FIFOs and baud rates up to 460 kbps - reduces CPU overhead and supports high-speed modem/serial peripheral links. |
| Parallel Port | IEEE 1284-compliant ECP/EPP/Standard mode with ChiProtect™ - delivers robust bidirectional data transfer and electrostatic discharge resilience in docking environments. |
| SMBus GPIO | 32 general-purpose pins powered by suspend supply (VTR) with interrupt-on-change and nSMBINT output - enables wake-from-suspend monitoring of external accessories. |
| Configuration Flexibility | Up to 480 I/O address options per logical device, 15 IRQ choices, 3 DMA channels - allows dynamic resource allocation in multi-device LPC topologies. |
| Package | 100-pin TQFP, RoHS compliant, 0.5 mm pitch - standard surface-mount footprint compatible with automated PCB assembly and thermal management in compact dock designs. |
Pinout & Package
Package: 100-pin Thin Quad Flat Package (TQFP), 14.0 × 14.0 mm body, 0.5 mm lead pitch, RoHS compliant. Standoff height 0.05–0.15 mm; coplanarity ≤ 0.08 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LAD[3:0] | LPC Address/Data Bus | Multiplexed 4-bit bidirectional bus for LPC I/O and DMA transfers; requires external latching and timing alignment with nLFRAME. |
| nLFRAME | LPC Frame Signal | Indicates start/end of LPC transaction cycle; synchronizes LAD[3:0] data validity and controls bus arbitration timing. |
| nLDRQ | LPC DMA Request | Open-drain active-low request signal to host for DMA service; supports burst and single-cycle transfers per LPC specification. |
| nSMBINT | SMBus Interrupt Output | Active-low interrupt asserted when any of the 32 SMBus-hosted GPIOs changes state - enables wake-event detection during system suspend. |
| nIO_PME | Power Management Event Output | Open-drain active-low signal indicating a PME-capable event (e.g., UART ring indicator, GPIO change) - connects directly to chipset's PME# input. |
| VTR | Suspend Supply Input | Provides standby power (typically 3.3 V) to SMBus GPIO block and critical logic during S3/S4 sleep states - ensures persistent I/O monitoring. |
Key Features
| Feature | Design Value |
|---|---|
| ACPI 1.0b/2.0 Compliance | Enables standardized OS-directed power state transitions (S0–S5) and hardware-controlled wake events without custom BIOS hooks. |
| ChiProtect™ Circuitry | Integrated transient voltage suppression on parallel port signals - eliminates need for external TVS diodes in docking station ESD-prone interfaces. |
| SMBus-Hosted GPIO Block | 32 pins powered by VTR with configurable direction, pull-up/down, and interrupt-on-change - supports hot-plug detection and accessory presence sensing. |
| Reprogrammable Logical Devices | All UART, parallel port, and GPIO resources expose configurable I/O address, IRQ, and DMA settings via internal configuration registers - simplifies BOM consolidation across platform variants. |
| PCI Clock Run Support | Allows host to maintain PCI_CLK during low-power states - preserves timing integrity for LPC-connected peripherals without requiring full system wake. |
Applications
| Enterprise Docking Stations | Industrial Port Replicators |
|---|---|
|
Use Scenario: A laptop docks into a fixed workstation with dual displays, Ethernet, USB hubs, and legacy parallel/serial peripherals. IC Role / Device Role / Timing Role: LPC47N237-MT serves as the primary LPC-attached I/O controller, managing UART communication with modems or barcode scanners and parallel port connectivity to label printers. Use Value: Enables full legacy peripheral support while maintaining ACPI-compliant suspend/resume behavior and reducing external component count via integrated ChiProtect™ and VTR-powered GPIO monitoring. |
Use Scenario: An industrial HMI panel uses a ruggedized port replicator to connect to PLCs, sensors, and receipt printers in factory-floor environments. IC Role / Device Role / Timing Role: LPC47N237-MT acts as the central I/O aggregation point, providing isolated UART and ECP parallel interfaces with surge-tolerant ChiProtect™ for noisy electrical conditions. Use Value: Delivers deterministic timing for printer handshaking (nSTROBE/nACK) and reliable ring-indicator wakeup from serial modems - critical for unattended remote maintenance operations. |
| Thin Client Expansion Modules | Medical Device Docking Adapters |
|
Use Scenario: A medical thin client docks into a centralized cart to access patient monitors, barcode scanners, and biometric readers via serial and parallel interfaces. IC Role / Device Role / Timing Role: LPC47N237-MT functions as the secure, reconfigurable I/O bridge between the LPC host and external peripherals - with all logical device resources locked down via configuration register write-protection. Use Value: Supports HIPAA-compliant audit logging via UART timestamping and enables fail-safe parallel port reset sequences through dedicated nINIT and nALF control lines. |
Use Scenario: A portable ultrasound device docks into a charging/communication cradle that connects to hospital networks via RS-232 and parallel-printer interfaces. IC Role / Device Role / Timing Role: LPC47N237-MT operates as the low-power I/O coordinator, using VTR-supplied SMBus GPIOs to detect cradle insertion and assert nIO_PME to wake the host from S3 sleep. Use Value: Guarantees sub-100 ms wake latency from dock attach and maintains UART FIFO integrity during battery-swapping events - essential for clinical workflow continuity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar docking I/O controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMSC LPC47M192-MS | Legacy SMSC part; identical 100-pin TQFP package and LPC/SMBus/GPIO architecture but lacks ChiProtect™ and has reduced ECP feature set. | Targeted at cost-sensitive docking solutions where parallel port surge immunity is handled externally. | Select when sourcing legacy SMSC-design platforms with minimal firmware changes and no requirement for integrated ESD protection on parallel lines. |
| Microchip LAN9252 | Ethernet-centric SoC with dual 10/100 PHY, no parallel/serial ports; includes SPI/I2C but no LPC interface or VTR-powered GPIO block. | Used in real-time industrial Ethernet gateways - not a functional replacement for legacy port expansion. | Consider only for new designs migrating away from LPC-based docking toward time-sensitive networking; not a drop-in alternative for LPC47N237-MT. |
Compared with LPC47N237-MT, the LPC47M192-MS offers near-identical LPC infrastructure but omits ChiProtect™ and advanced ECP features, while the LAN9252 represents a divergent architecture focused on industrial Ethernet rather than legacy I/O consolidation - making LPC47N237-MT uniquely suited for ACPI-compliant docking with integrated parallel/serial/standby-GPIO functionality.
Availability
LPC47N237-MT is available at Aetrix Electronics and suitable for enterprise docking stations, industrial port replicators, thin client expansion modules, and medical device docking adapters requiring stable component supply and long-term lifecycle support.
Supply support for LPC47N237-MT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology Inc. is a global provider of microcontrollers, analog components, and connectivity solutions, headquartered in Chandler, Arizona, with ISO/TS-16949-certified manufacturing and design facilities.
The LPC47N237-MT belongs to Microchip's legacy I/O controller product line, designed specifically to replace aging Super I/O chips in docking and port replication systems while maintaining full PC99a/ACPI compliance and backward compatibility with IBM PC/AT and IEEE 1284 standards.
FAQ
What is the operating voltage range for the LPC47N237-MT?
The LPC47N237-MT operates at a nominal 3.3 V supply with full 5 V tolerance on all I/O pins. This allows direct connection to both modern 3.3 V logic and legacy 5 V peripherals without external level-shifting circuitry. The VTR pin accepts a separate 3.3 V standby supply to maintain SMBus GPIO functionality during system suspend states. This dual-supply architecture is confirmed in the DS00001811A datasheet Section 1.0.
Does the LPC47N237-MT support ACPI-compliant power management?
Yes, the LPC47N237-MT is explicitly certified for ACPI 1.0b and 2.0 compliance. It supports standardized power states (S0–S5), includes dedicated nIO_PME signaling for wake events, and integrates sophisticated power control circuitry (PCC) enabling multiple low-power-down modes. These capabilities are documented in the Product Features section and functional description of DS00001811A, ensuring OS-directed power state transitions without custom BIOS intervention.
How many I/O address options does the LPC47N237-MT provide for its logical devices?
The LPC47N237-MT supports up to 480 configurable I/O address options for each logical device (UART, parallel port, GPIO), and up to 960 options specifically for the parallel port. This configurability is implemented via internal configuration registers accessible through the LPC interface, allowing system designers to avoid address conflicts in complex multi-peripheral docking environments - as specified in DS00001811A-page 2.
What is the purpose of ChiProtect™ in the LPC47N237-MT parallel port?
ChiProtect™ is integrated circuitry within the LPC47N237-MT's parallel port that provides transient voltage suppression and ESD protection on all data and control lines. It eliminates the need for external TVS diodes in docking station designs, improving reliability in electrically noisy environments such as factory floors or medical carts. This feature is explicitly called out in the Product Features list and block diagram of DS00001811A.
Can the LPC47N237-MT's SMBus-hosted GPIOs operate during system suspend?
Yes, the 32 SMBus-hosted GPIOs in the LPC47N237-MT are powered by the VTR (suspend supply) rail, enabling them to remain fully functional during S3 (suspend-to-RAM) and deeper sleep states. Any state change on these pins can assert the nSMBINT signal to wake the system - a capability confirmed in the Description section and block diagram (Figure 1) of DS00001811A.
LPC47N237-MT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 100-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- Applications:
- Controller
- Interface:
- LPC
- Voltage - Supply:
- 3.3V
- Supplier Device Package:
- 100-TQFP
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
LPC47N237-MT FAQ
1.How can I place an order for LPC47N237-MT through Aetrix?
Please submit a Request for Quotation (RFQ) for LPC47N237-MT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LPC47N237-MT reliable?
The price and inventory of LPC47N237-MT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LPC47N237-MT is usually 5 days.
3.What payment methods are accepted for LPC47N237-MT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LPC47N237-MT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LPC47N237-MT?
LPC47N237-MT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LPC47N237-MT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LPC47N237-MT?
For technical support, including LPC47N237-MT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LPC47N237-MT requirements.
6.How does Aetrix verify that LPC47N237-MT is sourced from the original manufacturer or authorized distributors?
All LPC47N237-MT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LPC47N237-MT meets industry standards.
7.What is the process for return or replacement of LPC47N237-MT?
All LPC47N237-MT units undergo pre-shipment inspection (PSI). If there is an issue with LPC47N237-MT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LPC47N237-MT part is unused and in its original packaging.
Return procedure for LPC47N237-MT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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