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 SMSC's 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 andData Bus
- Serial IRQ Interface Compatible with Serialized IRQ Support for PCI Systems
- PME Interface
• 100 Pin QFP PackageApplicationCircuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property damage. Any and all such uses without prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer. Copies of this document or other SMSC literature, as well as the Terms of Sale Agreement, may be obtained by visiting SMSC's website at http://www.smsc.com. SMSC is a registered trademark of Standard Microsystems Corporation ("SMSC"). Product names and company names are the trademarks of their respective holders.
SpecificationsOperating Temperature Range..........................................................................0oC to +70oC
Storage Temperature Range.......................................................................... -55o to +150oC
Lead Temperature Range .......................................................Refer to JEDEC Spec. J-STD-020
Positive Voltage on any pin, with respect to Ground................................................. Vcc+0.3V
Negative Voltage on any pin, with respect to Ground...................................................... -0.3V
Maximum Vcc...................................................................................................................... +7V
DescriptionThe 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.
The LPC47B27x incorporates a keyboard interface, SMSC's true CMOS 765B floppy disk controller, advanced digital data separator, two 16C550A compatible UARTs, one Multi-Mode parallel port which includes ChiProtect circuitry plus EPP and ECP, on-chip 12 mA AT bus drivers, one floppy direct drive support, and Intelligent Power Management including PME support. The true CMOS 765B core provides 100% compatibility with IBM PC/XT and PC/AT architectures in addition to providing data overflow and underflow protection. The SMSC advanced digital data separator incorporates SMSC's patented data separator technology, allowing for ease of testing and use. Both onchip UARTs are compatible with the NS16C550A. The parallel port is compatible with IBM PC/AT architecture, as well as IEEE 1284 EPP and ECP.
The LPC47B27x incorporates sophisticated power control circuitry (PCC) which includes support for keyboard, mouse and consumer infrared wake-up events. The PCC supports multiple low powerdown modes. The LPC47B27x supports the ISA Plug-and-Play Standard register set (Version 1.0a) and provides the recommended functionality to support Windows '95. The I/O Address, DMA Channel and hardware IRQ of each logical device in the LPC47B27x may be reprogrammed through the internal configuration registers.
There are 480 (960 for Parallel Port) I/O address location options, a Serialized IRQ interface, and three DMA channels. The LPC47B27x does not require any external filter components and is therefore easy to use and offers lower system costs and reduced board area. The LPC47B27x is software and register compatible with SMSC's proprietary 82077AA core. *The "x" in the part number is a designator that changes depending upon the particular BIOS used inside the specific chip. "2" denotes AMI Keyboard BIOS and "7" denotes Phoenix 42i Keyboard BIOS.
LPC47B27x Data Sheet
