General Description
The LPC47N237 is a 3.3V (5V Tolerant) PC99a/PC2001 compliant Docking I/O controller. The device, which implements the LPC interface, includes I/O functionality. LPC47N237’s LPC interface supports LPC I/O and DMA cycles. There is also a SMBus hosted GPIO Block.
The LPC47N237 provides 4 LPC general purpose pins which offer flexibility to the system designer. The legacy I/O included in the LPC47N237 are: a 16C550A compatible UART; one Multi-Mode parallel port including ChiProtect circuitry plus EPP and ECP. The parallel port is compatible with IBM PC/AT architecture, as well as IEEE 1284 EPP and ECP. The LPC47N237 incorporates sophisticated power control circuitry (PCC) which includes support for PME. The PCC supports multiple low power-down modes. The LPC47N237 is ACPI 1.0b/2.0 compatible.

Product Features
▪ 3.3 Volt Operation (5V Tolerant)
▪ 32 SMBus-Hosted General Purpose Input/Output Pins
   − SMBus Slave Controller Enables Read/Write Access to GPIO Ports
   − SMBus Runs on and GPIO Pins are Driven by Suspend Supply (VTR)
   − SMBus Interrupt Pin
   − SMBus Isolation Circuitry
▪ PC99a/PC2001 Compliant
▪ ACPI 1.0/2.0 Compliant
▪ Power Management Interface
▪ LPC Interface
   − Multiplexed Command, Address and Data Bus
   − Serial IRQ Interface Compatible with Serialized IRQ Support for PCI Systems
   − nIO_PME pin for UART Ring Indicate
   − PCI Clock Run Support
▪ 4 LPC-Hosted General Purpose Input/Output Pins
▪ Serial Port
   − Full Function Serial Port
   − High Speed 16C550A Compatible UART with 16-Byte Send/Receive FIFOs
   − Programmable Baud Rate Generator supports 230k and 460k Baud
   − Modem Control Circuitry
   − 480 Address and 15 IRQ Options
   − Ring Indicator Wakeup Event
▪ 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
   − 480 Address, Up to 15 IRQ and Three DMA Options
▪ XNOR-Chain
▪ 100 pin TQFP package; green, lead-free package also available