GENERAL DESCRIPTION
The LPC47B27x* is a 3.3V PC98/PC99 compliant Super I/O controller. The LPC47B27x implements the LPC interface, a pin reduced ISA bus interface which provides the same or better performance as the ISA/X-bus with a substantial savings in pins used. The LPC47B27x provides fan control through two fan speed control output pins and two fan tachometer input pins. It also provides 37 general purpose input/output (GPIO) pins, a dual game port interface, MPU-401 MIDI support and ISA IRQ to Serial IRQ conversion.

FEATURES
• 3.3 Volt Operation, 5 Volt Tolerant
• LPC Interface
• Fan Control
   - Fan Speed Control Outputs (2)
   - Fan Tachometer Inputs (2)
• Programmable Wake-up Event Interface
• PC98, PC99, and ACPI 1.0 Compliant
• Dual Game Port Interface
• MPU-401 MIDI Support
• General Purpose Input/Output Pins (37)
• ISA IRQ to Serial IRQ Conversion
• ISA Plug-and-Play Compatible Register Set
• Intelligent Auto Power Management
• System Management Interrupt
• 2.88MB Super I/O Floppy Disk Controller
   - Licensed CMOS 765B Floppy Disk Controller
   - Software and Register Compatible with SMSCs Proprietary 82077AA Compatible Core
   - Supports Two Floppy Drives Directly
   - Configurable Open Drain/Push-Pull Output Drivers
   - Supports Vertical Recording Format
   - 16-Byte Data FIFO
   - 100% IBM® Compatibility
   - Detects All Overrun and Underrun Conditions
   - Sophisticated Power Control Circuitry (PCC) Including Multiple Powerdown Modes for Reduced Power Consumption
   - DMA Enable Logic
   - Data Rate and Drive Control Registers
   - 480 Address, Up to 15 IRQ and Three DMA Options
• Floppy Disk Available on Parallel Port Pins
• Enhanced Digital Data Separator
   - 2 Mbps, 1 Mbps, 500 Kbps, 300 Kbps, 250 Kbps Data Rates
   - Programmable Precompensation Modes
• Keyboard Controller
   - 8042 Software Compatible
   - 8 Bit Microcomputer
   - 2k Bytes of Program ROM
   - 256 Bytes of Data RAM
   - Four Open Drain Outputs Dedicated for Keyboard/Mouse Interface
   - Asynchronous Access to Two Data Registers and One Status Register
   - Supports Interrupt and Polling Access
   - 8 Bit Counter Timer
   - Port 92 Support
   - Fast Gate A20 and KRESET Outputs
• Serial Ports
   - Two Full Function Serial Ports
   - High Speed NS16C550A Compatible UARTs with Send/Receive 16-Byte FIFOs
   - Supports 230k and 460k Baud Programmable Baud Rate Generator Modem Control Circuitry
   - 480 Address and 15 IRQ Options
• Infrared Port
   - Multiprotocol Infrared Interface
   - 32-Byte Data FIFO
   - IrDA 1.0 Compliant
   - Consumer IR
   - SHARP ASK IR
   - 480 Address, Up to 15 IRQ and Three DMA Options
• Multi-Mode™ Parallel Port with ChiProtect™
   - Standard Mode IBM PC/XT®, PC/AT®, and PS/2™ Compatible Bidirectional Parallel Port
   - Enhanced Parallel Port (EPP) Compatible - EPP 1.7 and EPP 1.9 (IEEE 1284 Compliant)
   - IEEE 1284 Compliant Enhanced Capabilities Port (ECP)
   - ChiProtect Circuitry for Protection
   - 960 Address, Up to 15 IRQ and Three DMA Options
• LPC Interface
   - Multiplexed Command, Address and Data Bus
   - Serial IRQ Interface Compatible with Serialized IRQ Support for PCI Systems
   - PME Interface
• 100 Pin QFP Lead-Free RoHS Compliant Package