Note: The LPC47S457 is not recommended for new designs. The SCH4304 is the suggested replacement device for this product.

Features

• 3.3 Volt Operation (5V Tolerant)
• Floppy Disk Controller (Supports Two FDCs)
• Multi-Mode Parallel Port
• Two UARTs
• 8042 Keyboard Controller
• SMBus Controller
  • SMBus Access to LCD Interface
  • SMBus Serial Port 2 Interface Disable
  • SMBus Access to Power On Elapsed Time Counters
  • Programmable Slave Address
• X-Bus Interface
  • Supports up to Four External I/O Components
  • Offers Two Modes of Operation
  • Support for Driving LCD Panel Interface Controller
  • Supports Port 80h Monitoring
• Programmable Wakeup Event Interface (IO_PME# Pin)
• SMI Support (IO_SMI# Pin)
• GPIOs (55)
• Fan Controller
  • One Fan Speed Control Output
  • One Fan Tachometer Input
• ISA IRQ to Serial IRQ Conversion
• XNOR Chain for Board Test Mode
• PC2001 and ACPI 2.0 Compliant
• 128 Pin QFP Package
• ISA Plug-and-Play Compatible Register Set
• Intelligent Auto Power Management
• Power On Elapsed Time Counters
  • Counter for Main Power
  • Counter for Standby Power
• Real Time Clock
  • MC146818 and DS1287 Compatible
  • 256 Bytes of Battery Backed CMOS in Two 128-Byte Banks
  • 128 Bytes of CMOS RAM Lockable in 4x32 Byte Blocks
  • 12 and 24 Hour Time Format
  • 24-Hour Daily Alarm
  • 30-Day Alarm
  • Binary and BCD Format
  • <1uA Standby Current (typ)
• 2.88MB I/O Floppy Disk Controller
  • Licensed CMOS 765B Floppy Disk Controller
  • Software and Register Compatible with SMSC's Proprietary 82077AA Compatible Core
  • 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 Four DMA Options
• 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 NS16C550 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
  • IrDA 1.0, HP-SIR, ASK IR Support
• 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 Against Damage Due to Printer Power-On
  • 960 Address, up to 15 IRQ and Four DMA Options
• Pin Reduced ISA Host Interface (LPC Bus)
  • Multiplexed Command, Address and Data Bus
  • 8-Bit I/O Transfers
  • 8-Bit DMA Transfers
  • 16-Bit Address Qualification
  • Serial IRQ Interface Compatible with Serialized IRQ Support for PCI Systems
  • Power Management Event (PME) Interface Pin
• Power Management
  • ACPI Registers