LPC47B277-MS Standard Microsystems (SMSC), LPC47B277-MS Datasheet - Page 3

• Manufacturer Part Number: LPC47B277-MS
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LPC47B277-MS

• Pin Count: 100
• Lead Free Status / RoHS Status: Compliant

100 Pin Enhanced Super I/O Controller with LPC Interface
General Description
SMSC LPC47B27x
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.
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 on-chip 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 power-down 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.
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Revision 04-17-07